2021

Enhanced Performance and Stability of Carbon Counter Electrode-Based MAPbI3 Perovskite Solar Cells with p-Methylphenylamine Iodate Additives

Ya Xu, Yin Huang, Hang Zhong, Wenbo Li, Duoling Cao, Congqiang Zhang, Huaxi Bao, Zhiguang Guo, Li Wan, Xu Zhang, Xiuhua Zhang, Yuebin Li, Xinbao Wang, Dominik Eder, Shimin Wang

ACS Appl. Energy Mater., 2021

DOI: https://doi.org/10.1021/acsaem.1c02141

Methylammonium lead iodide perovskite (MAPbI3) demonstrates the disadvantage of poor long-term stability. Additive engineering is an effective measure to address this issue. We have successfully used an organic molecule called p-methylbenzoammonium iodate (p-MePMAI) as an additive to a perovskite precursor. Results showed that p-MePMAI is an excellent additive with functional groups of benzyl and ammonium ions that can improve the performance and stability of carbon counter electrode (CE)-based MAPbI3 perovskite solar cells.

Selective Ligand Exchange Synthesis of Au16(2-PET)14 from Au15(SG)13

Vera Truttmann, Stephan Pollitt, Hedda Drexler, Sreejith P. Nandan, Dominik Eder, Noelia Barrabes, Günther Rupprechter

J. Chem. Phys. (in press) 2021

DOI: https://doi.org/10.1063/5.0062534

This work reports on the selective size transformation of Au15(SG)13 (SG: glutathione) nanoclusters to Au16(2-PET)14 (2-PET: 2-phenylethanethiol) nanoclusters through a two-phase ligand exchange process at room temperature. Among several parameters evaluated, the addition of a large excess of exchange thiol (2-PET) to the organic phase was identified as key factor for the structure conversion.

Peeling graphite layer by layer reveals the charge exchange dynamics of ions inside a solid

Anna Niggas, Sascha Creutzburg, Janine Schwestka, Benjamin Wöckinger, Tushar Gupta, Pedro L Grande, Dominik Eder, José P Marques, Bernhard C Bayer, Friedrich Aumayr, Robert Bennett, Richard A Wilhelm

Communications Physics, 2021, 4, 180

DOI: https://doi.org/10.1038/s42005-021-00686-1

We demonstrate that by coupling an AFM with a scanning electron microscope (SEM) as the second, mechanically independent probe, we can directly and in situ visualize by SEM at high resolution 2D membrane deformations that result from controllable AFM tip manipulations in the nN range. Employing few-layer graphene as model membranes, we discuss the experimental realization of our coupled in situ AFM-SEM approach.

Elucidating the formation and active state of Cu co-catalysts for photocatalytic hydrogen evolution

Jasmin Schubert, Leila Kalantari, Andreas Lechner, Ariane Giesriegl, Sreejith Nandan, Pablo Ayala, Shun Kashiwaya, Markus Sauer, Annette Foelske, Johanna Rosen, Peter Blaha, Alexey Cherevan and Dominik Eder

Journal of Materials Chemistry A, 2021, 9, 21958-21971

DOI: https://doi.org/10.1039/d1ta05561e

Calcination of Cu/TiO2 is detrimental to its photocatalytic HER performance. In this work, we relate this effect to heat-activated Cu diffusion into the TiO2 lattice, which decreases the accessibility of the Cu sites on the surface and generates charge recombination centers.

Direct visualization of local deformations in suspended few-layer graphene membranes by coupled in situ atomic force and scanning electron microscopy

Stefan Hummel, Kenan Elibol, Dengsong Zhang, Krishna Sampathkumar, Otakar Frank, Dominik Eder, Christian Schwalb, Jani Kotakoski, Jannik C Meyer, Bernhard C Bayer

Applied Physics Letters, 2021, 118,10, 103104.

DOI: https://doi.org/10.1063/5.0040522

We demonstrate that by coupling an AFM with a scanning electron microscope (SEM) as the second, mechanically independent probe, we can directly and in situ visualize by SEM at high resolution 2D membrane deformations that result from controllable AFM tip manipulations in the nN range. Employing few-layer graphene as model membranes, we discuss the experimental realization of our coupled in situ AFM-SEM approach.

Single indium atoms and few-atom indium clusters anchored onto graphene via silicon heteroatoms

Kenan Elibol, Clemens Mangler, David D. O'Regan, Kimmo Mustonen, Dominik Eder, Jannik C. Meyer, Jani Kotakoski, Richard G. Hobbs, Peter A. van Aken, Toma Susi, Bernhard C. Bayer

ACS Nano 2021, 15, 9, 14373-14383

DOI: https://doi.org/10.1021/acsnano.1c03535

Single atoms and few-atom nanoclusters are of high interest in catalysis and plasmonics, but pathways for their fabrication and placement remain scarce. We report here the self-assembly of room-temperature-stable single indium (In) atoms and few-atom In clusters (2–6 atoms) that are anchored to substitutional silicon (Si) impurity atoms in suspended monolayer graphene membranes.

Defects in Photocatalysis

Greta Haselmann, Dominik Eder

Book Chapter. In: Heterogeneous Photocatalysis. From Fundamentals to Applications in Energy Conversion and Depollution, ed. Jennifer Strunk
2021, 187-213

ISBN: 978-3-527-81526-5

Defects–deviations from order–are the reactive centers of solid materials and dictate their structural and electronic properties. Defects can, for example, induce ionic and electronic conductivity, thereby giving rise to electrolytes used in solid-state fuel cells or to the n-type semiconductivity in TiO2.

Phosphate‐Templated Encapsulation of a {CoII 4O4} Cubane in Germanotungstates as Carbon‐Free Homogeneous Water Oxidation Photocatalysts

Emir Al-Sayed, Sreejith P. Nandan, Elias Tanuhadi, Gerald Giester, Marco Arrigoni, Georg K. H. Madsen, Alexey Cherevan, Dominik Eder, Annette Rompel

ChemSusChem, 2021, 14,12, 2529-2536.

DOI: https://doi.org/10.1002/cssc.202100506

The ever‐growing interest in sustainable energy sources leads to a search for an efficient, stable, and inexpensive homogeneous water oxidation catalyst (WOC). Herein, the PO4 3− templated synthesis of three abundant‐metal‐based germanotungstate (GT) clusters Na15[Ge4PCo4(H2O)2W24O94] ⋅ 38H2O (Co4), Na2.5K17.5[Ge3PCo9(OH)5(H2O)4W30O115] ⋅ 45H2O (Co9), Na6K16[Ge4P4Co20(OH)14(H2O)18W36O150] ⋅ 61H2O (Co20) with non‐, quasi‐, or full cubane motifs structurally strongly reminiscent of the naturally occurring {Mn4Ca} oxygen evolving complex (OEC) in photosystem II was achieved.. 

Defects in Photocatalysis

Greta Haselmann, Dominik Eder

In: Heterogeneous Photocatalysis, edited by Jennifer Strunk

ISBN: 987-3-527-34464-2

This chapter is divided into two larger sections: The first part provides a common ground of knowledge on basic concepts in defect chemistry, such as definitions, key criteria, strategies to introduce defects, and typical methods for characterization that are also key to other research fields, eg microelectronics, photovoltaics, and sensor applications. The second section discusses how this knowledge can be applied to photocatalytic applications, specifically in the context of heterogeneous photocatalysis.

Resolving few-layer antimonene/graphene heterostructures

Tushar Gupta, Kenan Elibol, Stefan Hummel, Michael Stöger-Pollach, Clemens Mangler, Gerlinde Habler, Jannik C. Meyer, Dominik Eder, Bernhard C. Bayer

npj 2D Materials and Applications 2021, 5, 53

DOI:https://doi.org/10.1038/s41699-021-00230-3

Two-dimensional (2D) antimony (Sb, “antimonene”) is of interest in electronics and batteries. Sb however exhibits a large allotropic structural diversity, which is also influenced by its support. Thus, Sb heterostructure formation is key in 2D Sb integration. Particularly, 2D Sb/graphene interfaces are important. We thus study here few-layered 2D Sb/graphene heterostructures with atomic resolution (scanning) transmission electron microscopy.

Layered double hydroxide (LDH)-based materials: A mini-review on strategies to improve the performance for photocatalytic water splitting

Hanane Boumeriame, Eliana S. Da Silva, Alexey Cherevan, Tarik Chafik, Joaquim L Faria, Dominik Eder

Journal of Energy Chemistry, 2021, 64, 406-431

DOI:https://doi.org/10.1016/j.jechem.2021.04.050

The high energy demand we currently face in society and the subsequent large consumption of fossil fuels cause its depletion and increase the pollution levels. The quest for the production of clean energy from renewable and sustainable sources remains open.

Ti-based MOFs: New insights on the impact of ligand composition and hole scavengers on stability, charge separation and photocatalytic hydrogen evolution

Jia Wang, Alexey Cherevan, Celine Hannecart, Shaghayegh Naghdi, Sreejith P. Nandan, Tushar Gupta, Dominik Eder

Applied Catalysis B, 2021, 283, 119626

DOI: https://doi.org/10.1016/j.apcatb.2020.119626

We synthesized a series of isostructural MIL-125-Ti with various terephthalic: amino-terephthalic acid ratios and evaluated their photostability and performance for photocatalytic hydrogen evolution in aqueous solutions with different hole scavengers. We demonstrate that the commonly used triethanolamine corroded the MOFs under photocatalytic conditions, in contrast to methanol.

Samarium-Doped Nickel Oxide for Superior Inverted Perovskite Solar Cells: Insight into Doping Effect for Electronic Applications

Huaxi Bao, Minyong Du, Hui Wang, Kai Wang, Xiaokun Zuo, Fangyv Liu, Lu Liu, Dominik Eder, Alexey Cherevan, Shimin Wang, Li Wan, Shuai Thao, Shengzhong (Frank) Liu

Adv. Functional Materials 2021

DOI: https://doi.org/10.1002/9781119429418.ch4

Hole transport layers (HTLs) play a key role in perovskite solar cells (PSCs), particularly in the inverted PSCs (IPSCs) that demand more in its stability. In this study, samarium-doped nickel oxide (Sm:NiOx) nanoparticles are synthesized via a chemical precipitation method and deposited as a hole transport layer in the IPSCs.

Near-Infrared Femtosecond Laser Ablation of Au-Coated Ni: Effect of Organic Fluids and Water on Crater Morphology, Ablation Efficiency and Hydrodynamic Properties of NiAu Nanoparticles

Niusha Lasemi, Günther Rupprechter, Gerhard Liedl, Dominik Eder

Materials 2021, 14(19) 5544

DOI:https://doi.org/10.3390/ma14195544

Scanning electron microscopy (SEM) and profilometry of the crater morphology and ablation efficiency upon femtosecond laser ablation of Au-coated Ni targets in various fluids revealed a pronounced dependence on the ablation medium.

Isolation Strategy towards Earth-Abundant Single-Site Co-Catalysts for Photocatalytic Hydrogen Evolution Reaction

Pablo Ayala, Ariane Giesriegl, Sreejith P Nandan, Stephen Nagaraju Myakala, Peter Wobrauschek, Alexey Cherevan

Catalysts 2021, 11(4), 417

DOI:https://doi.org/10.3390/catal11040417

Achieving efficient photocatalytic water splitting remains one of the most vital challenges in the photocatalysis field, as the performance of contemporary heterogeneous catalysts is still limited by their insufficient activity and low predictability. To address this challenge, this work takes inspiration from the concept of heterogeneous single-metal-site catalysts (HSMSCs) and follows the idea of site-isolation, aiming towards single-site co-catalyst species and a higher atom-utilization efficiency.

Hybrid carbon spherogels: carbon encapsulation of nano-titania

Miralem Salihovic, Jürgen Schoiber, Alexey Cherevan, Christoph Rameshan, Gerhard Fritz-Popovski, Maike Ulbricht, Stefanie Arnold, Volker Presser, Oskar Paris, Maurizio Musso, Nicola Hüsing, Michael S Elsaesser

Materials 2021, 14(19) 5544

DOI:https://doi.org/10.1039/D1CC00697E

Extraordinarily homogeneous, freestanding titania-loaded carbon spherogels can be obtained using Ti(acac)2(OiPr)2 in the polystyrene sphere templated resorcinol-formaldehyde gelation. Thereby, a distinct, crystalline titania layer is achieved inside every hollow sphere building unit. These hybrid carbon spherogels allow capitalizing on carbon's electrical conductivity and the lithium-ion intercalation capacity of titania.

Analysis of the Ordering Effects in Anthraquinone Thin Films and Its Potential Application for Sodium Ion Batteries

Daniel Werner, Dogukan H Apaydin, Dominik Wielend, Katharina Geistlinger, Wahyu D Saputri, Ulrich J Griesser, Emil Dražević, Thomas S Hofer, Engelbert Portenkirchner

The Journal of Physical Chemistry C, 2021, 125 (7), 3745-3757

DOI:https://doi.org/10.1021/acs.jpcc.0c10778

The ordering effects in anthraquinone (AQ) stacking forced by thin-film application and its influence on dimer solubility and current collector adhesion are investigated. The structural characteristics of AQ and its chemical environment are found to have a substantial influence on its electrochemical performance. Computational investigation for different charged states of AQ on a carbon substrate obtained via basin hopping global minimization provides important insights into the physicochemical thin-film properties.

A Beginner's Guide to Organic Semiconductor Photoelectrodes for the Reduction of Carbon Dioxide

Dogukan H. Apaydin

Israel Journal of Chemistry 2021, 61

DOI:https://doi.org/10.1002/ijch.202100085

This review aims to give insights to basics of photoelectrochemical CO2 reduction and shows examples of OSCs that are utilized for CO2RR as photoelectrocatalysts.

2020

Perylenetetracarboxylic Diimide as Diffusion‐Less Electrode Material for High‐Rate Organic Na‐Ion Batteries

Sebastian Liebl, Daniel Werner, Dogukan H Apaydin, Dominik Wielend, Katharina Geistlinger, Engelbert Portenkirchner

Chemistry (Weinheim an der Bergstraße, Germany), 2020, 26(72) 17559-17566

DOI:https://doi.org/10.1002/chem.202003624

Achieving efficient photocatalytic water splitting remains one of the most vital challenges in the photocatalysis field, as the performance of contemporary heterogeneous catalysts is still limited by their insufficient activity and low predictability. To address this challenge, this work takes inspiration from the concept of heterogeneous single-metal-site catalysts (HSMSCs) and follows the idea of site-isolation, aiming towards single-site co-catalyst species and a higher atom-utilization efficiency.

Toward the Recovery of Platinum Group Metals from a Spent Automotive Catalyst with Supported Ionic Liquid Phases

Olga Lanaridi, Apurba Ranjan Sahoo, Andreas Limbeck, Shaghayegh Naghdi, Dominik Eder, Elisabeth Eitenberger, Zita Csendes, Michael Schnürch, Katharina Bica-Schröder

ACS Sustainable Chem. Eng. 2020, 9, 1, 375-386

DOI: https://doi.org/10.1021/acssuschemeng.0c07384

We present a novel approach for the separation and recovery of Pt and Pd leached from a spent automotive catalyst relying on conventional and polymerized supported ionic liquid phases (SILPs and polySILPs, respectively). A variety of parameters with possible effects on the separation behavior, namely, acidity and concentration of the platinum group metal (PGM) containing solution, as well as different SILP and polySILP loadings, were evaluated for the separation of PGMs in the presence of high concentrations of Al, Fe, Zn, and Ce.

Carbon Nanotubes. Synthesis, Properties, and New Developments in Research

Marianna V. Kharlamova, Dominik Eder

Book Chapter. In: Synthesis and Applications of Nanocarbons, eds. Jean-Charles Anault, Dominik Eder
2020, 107-147

DOI: https://doi.org/10.1002/9781119429418.ch4

Carbon nanotubes (CNTs) consisting of rolled up layers of sp2 carbon atoms were first observed in the product of the hydrogenation reaction of CO over Fe catalyst. This chapter briefly introduces properties and basic aspects of the synthesis and postsynthesis treatments of single-walled CNTs (SWCNTs) and covers new developments in CNT research aimed at obtaining SWCNTs with controlled properties. 

Electrochemical Behavior of Graphene in a Deep Eutectic Solvent

David Fuchs, Bernhard C. Bayer, Tushar Gupta, Gabriel L. Szabo, Richard A. Wilhelm, Dominik Eder, Jannik C. Meyer, Sandra Steiner, Bernhard Gollas

ACS Appl. Mater. Interfaces 2020, 12, 36, 40937-40948

DOI: https://doi.org/10.1021/acsami.0c11467

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Graphene electrodes and deep eutectic solvents (DESs) are two emerging material systems that have individually shown highly promising properties in electrochemical applications. To date, however, it has not been tested whether the combination of graphene and DESs can yield synergistic effects in electrochemistry. 

The role of contaminations in ion beam spectroscopy with freestanding 2D materials: A study on thermal treatment

A. Niggas, J. Schwestka, S. Creutzburg, T. Gupta, D. Eder, B. C. Bayer, F. Aumayr, Dominik Eder
J. Chem. Phys. 2020, 153, 014702

DOI: https://doi.org/10.1063/5.0011255

As surface-only materials, freestanding 2D materials are known to have a high level of contamination—mostly in the form of hydrocarbons, water, and residuals from production and exfoliation. For well-designed experiments, it is of particular importance to develop effective cleaning procedures, especially since standard surface science techniques are typically not applicable. We perform ion spectroscopy with highly charged ions transmitted through freestanding atomically thin materials and present two techniques to achieve clean samples, both based on thermal treatment.

Process Pathway Controlled Evolution of Phase and Van-der-Waals Epitaxy in In/In₂O₃ on Graphene Heterostructures

Kenan Elibol, Clemens Mangler, Tushar Gupta, Georg Zagler, Dominik Eder, Jannik C. Meyer, Jani Kotakoski, Bernhard C. Bayer

Adv. Functional Materials 2020, 30, 34, 2003300

DOI: https://doi.org/10.1002/adfm.202003300

Applications of 2D materials often require deposition of non-2D metals and non-2D metal-oxides but mechanisms of such non-2D/2D interfacing remain elusive. Here, atomically resolved scanning transmission electron microscopy follows in a “quasi-in-situ” fashion the entire fabrication cycle of application-relevant non-2D In and non-2D In2O3 nanostructures on graphene and thereby clarifies key factors governing non-2D/2D interfacing the atomic scale. 

In Situ Pt Photodeposition and Methanol Photooxidation on Pt/TiO₂: Pt-Loading-Dependent Photocatalytic Reaction Pathways Studied by Liquid-Phase Infrared Spectroscopy

Greta M. Haselmann, Bettina Baumgartner, Jia Wang, Karin Wieland, Tushar Gupta, Christopher Herzig, Andreas Limbeck, Bernhard Lendl, Dominik Eder
ACS Catal. 2020, 10, 5, 2964-2977

DOI: https://doi.org/10.1021/acscatal.9b05588

We developed a top-irradiated, liquid-phase attenuated total reflectance Fourier transform infrared (ATR-FTIR) setup that allows time-resolved investigations of both Pt particle growth during in situ photodeposition via monitoring of the Pt0–COads band on TiO2 thin films as well as the photooxidation of methanol in aqueous environments.  

Polyoxometalates on Functional Substrates: Concepts, Synergies, and Future Perspectives

Alexey S. Cherevan, Sreejith P. Nandan, Isolda Roger, Rongji Liu, Carsten Streb, Dominik Eder

Adv. Sci. 2020, 1903511

DOI: https://doi.org/10.1002/advs.201903511

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Polyoxometalates (POMs) are molecular metal oxide clusters that feature a broad range of structures and functionalities, making them one of the most versatile classes of inorganic molecular materials. They have attracted widespread attention in homogeneous catalysis. 

Effect of boron incorporation on the bioactivity, structure, and mechanical properties of ordered mesoporous bioactive glasses
Leonie Deilmann, Oliver Winter, Bianca Cerrutti, Henrik Bradtmüller, Christopher Herzig, Andreas Limbeck, Olaf Lahayne, Christian Hellmich, Hellmut Eckert  and Dominik Eder
J. Mater. Chem. B, 2020, 8, 1456-1465

DOI: https://doi.org/10.1039/C9TB01805K 

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B2O3 doped (0.5–15 mol%) ordered mesoporous bioactive glasses (MBG) with the composition 80% SiO2–15% CaO–5% P2O5 were synthesized via a sol–gel based evaporation-induced self-assembly process using the block-copolymer P123 as a structure directing agent and characterized by biokinetic, mechanical and structural investigations.  

(CH3NH3)3Bi2I9 perovskite films fabricated via a two-stage electric-field-assisted reactive deposition method for solar cells application

Yulong Wang, Yue Liu, Ya Xu, Congqiang Zhang, Huaxi BaoaJi Wang, Zhiguang Guo, Li Wan, Dominik, Eder, Shimin Wang

Electrochimica Acta, Volume 329, 1 January 2020, 135173

DOI: https://doi.org/10.1016/j.electacta.2019.135173

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Methylammonium bismuth iodide ((CH3NH3)3Bi2I9, MBI) is a promising alternative to perovskite solar cells (PSCs) due to its air stability and low-toxicity. Herein, a two-stage electric-field-assisted reactive deposition method has been introduced to prepare MBI films for the first time. PSCs based on MBI films were fabricated and characterized. 

New imaging modes for analyzing suspended ultra-thin membranes by double-tip scanning probe microscopy

Kenan Elibol, Stefan Hummel, Bernhard C. Bayer, Jannik C. Meyer

Scientific Reports 2020, 10, 4839

DOI: https://doi.org/10.1038/s41598-020-60731-x

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Here, we demonstrate new types of measurements that become possible with two SPM instruments (atomic force microscopy, AFM, and scanning tunneling microscopy, STM) that are situated on opposite sides of a suspended two-dimensional (2D) material membrane and thus allow to bring both SPM tips arbitrarily close to each other.

Aerosol Jet Printed Nanocarbons on Heat Sink Materials

Reinhard Kaindl, Bernhard C. Bayer, Tushar Gupta, Songfeng Pei, Pengxiang Hou, Jinhong Du, Chang Liu, Wencai Ren, Alexander Blümel, Paul Patter, Karl Popovic, David Dergez, Wolfgang Waldhauser

Proceedings 2020, 56, 1, 30

DOI: https://doi.org/10.3390/proceedings2020056030

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Graphene- and carbon nanotube (CNT)-based inks have been printed on relevant heat sink materials by Aerosol jet. The thickness of the layers varied between ~100 and ~1.500 nm. The inks’ viscosity ranged from <20 up to 600 cps at a solid content between 0.18 and 3% and wide particle sizes from 5 nm up to 5 µm. The printed layers could be interesting for rather high-power and high-temperature applications including thermal heat spreaders, resistive heaters, high-current carrying interconnectors, temperature sensors and ordnance fuze technology.

2019

Nanoscale aluminum plasmonic waveguide with monolithically integrated germanium detector
M. Sistani, M. G. Bartmann, N. A. Güsken, R. F. Oulton, H. Keshmiri, M. S. Seifner, S. Barth, N. Fukata, M. A. Luong, M.I. den Hertog, A. Lugstein 
Applied Physics Letters 2019, 115, 161107

DOI: https://doi.org/10.1063/1.5115342

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Surface plasmon polaritons have rapidly established themselves as a promising concept for molecular sensing, near-field nanoimaging, and transmission lines for emerging integrated ultracompact photonic circuits. In this letter, we demonstrate a highly compact surface plasmon polariton detector based on an axial metal-semiconductor-metal nanowire heterostructure device.

Femtosecond laser-assisted synthesis of Ni/Au BONs in various alcoholic solvents

Niusha Lasemi, Christian Rentenberger, Robert Pospichal, Alexey S. Cherevan,Martin Pfaffeneder-Kmen, Gerhard Liedl, Dominik Eder

Applied Physics A 2019, 125, 8, 544

DOI: https://doi.org/10.1007/s00339-019-2826-z

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Crystalline Ni/Au bimetallic oxide nanoparticles with various forms of crystallographic systems and defects were generated by femtosecond laser ablation of nickel–gold target in alcoholic solvents. The nature of the liquid can influence the chemical composition, stability, and size distribution of laser-synthesized nanoparticles.

Rate-Limiting Steps of Dye Degradation over Titania-Silica Core-Shell Photocatalysts

Ariane Giesriegl, Jakob Blaschke, Shaghayegh Naghdi, Dominik Eder

Catalysts 2019, 9, 7, 583

DOI:https://doi.org/10.3390/catal9070583

Anti-solvent spin-coating for improving morphology of lead-free (CH3NH3)3Bi2I9 perovskite films

Zhihui Liu, Miaomiao Chen, Li Wan, Yue Liu, Yulong Wang, Yisheng Gan, Zhiguang Guo, Dominik Eder, Shimin Wang

SN Applied Sciences 2019, 1:706

DOI: https://doi.org/10.1007/s42452-019-0727-6

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Methylammonium iodide bismuthate ((CH3NH3)3Bi2I9) (MIB) perovskite has attracted research attention because of its low toxicity and stability in air. However, MIB perovskite also has its inherent defects, e.g., MIB films have too many pinholes and large indirect band gap.

Revealing the doping effect of encapsulated lead halogenides on single-walled carbon nanotubes

Marianna V. Kharlamova, Christian Kramberger, Paolo Rudatis, Thomas Pichler, Dominik Eder

Applied Physics A 2019, 125:320

DOI: https://doi.org/10.1007/s00339-019-2626-5

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We have investigated the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with lead chloride, lead bromide (PbBr2) and lead iodide (PbI2). The filling of SWCNTs and formation of encapsulated one-dimensional nanocrystals of the salts were directly confirmed by high-resolution scanning transmission electron microscopy.

Synthesis and Properties of Single-Walled Carbon Nanotubes Filled with Metal Halogenides and Metallocenes

Marianna V. Kharlamova, Dominik Eder

Book Chapter: Cabon Nanotubes, Intech Open Limited 2019

DOI: https://doi.org/10.5772/intechopen.85062

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This chapter reviews the current status of the research on the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with metal halogenides and metallocenes and growth kinetics of inner SWCNTs inside metallocene-filled nanotubes.

Immobilization of Co, Mn, Ni and Fe oxide co-catalysts on TiO2 for photocatalytic water splitting reactions

Jasmin S. Schubert, Janko Popovic, Greta M. Haselmann, Sreejith P. Nandan, Jia Wang, Ariane Giesriegl, Alexey S. Cherevan*, Dominik Eder*

Journal of Materials Chemistry A 2019, 7, 18568-18579

DOI: https://doi.org/10.1039/C9TA05637H

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Here we report a systematic study of a series of non-noble-metal co-catalysts based on Co, Mn, Ni and Fe oxides that were prepared by wet impregnation of the corresponding acetylacetonate precursors onto a model TiO2 substrate, followed by their oxidative decomposition.

2018

Ordered Mesoporous TiO2 Gyroids: Effects of Pore Architecture and Nb‐Doping on Photocatalytic Hydrogen Evolution under UV and Visible Irradiation

Tobias Sebastian Dörr, Leonie Deilmann, Greta Haselmann, Alexey Cherevan, Peng Zhang, Peter Blaha, Peter William de Oliveira, Tobias Kraus, Dominik Eder

Advanced Energy Materials 2018, 8, 36, 1802566

DOI: https://doi.org/10.1002/aenm.201802566

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Superior hydrogen evolution is achieved by using highly ordered mesoporous pure and Nb‐doped TiO₂ with alternating gyroid architecture due to their large pores and 3D connectivity. The incorporation of Nb⁵⁺ has different effects on visible and UV‐based photocatalysis.

Comparison of Doping Levels of Single‐Walled Carbon Nanotubes Synthesized by Arc‐Discharge and Chemical Vapor Deposition Methods by Encapsulated Silver Chloride

Marianna V. Kharlamova, Christian Kramberger, Oleg Domanov, Andreas Mittelberger, Takeshi Saito, Kazuhiro Yanagi, Thomas Pichler, Dominik Eder

physica status solidi (b) 2018, 255, 12, 1800178

DOI: https://doi.org/10.1002/pssb.201800178

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Kharlamova et al. perform the filling of single‐walled carbon nanotubes (SWCNTs) synthesized by the arc‐discharge and chemical vapor deposition methods with silver chloride. The electronic properties of the filled nanotubes are characterized by Raman spectroscopy and X‐ray photoelectron spectoscopy. The authors reveal different doping levels of SWCNTs synthesized by the different methods.

Enhancing antibiofilm activity with functional chitosan nanoparticles targeting biofilm cells and biofilm matrix

Yulong Tan, Su Ma, Matthias Leonhard, Doris Moser, Greta M. Haselmann, Jia Wang, Dominik Eder, Berit Schneider-Stickler

Carbohydrate Polymers 2018, 200, 35-42

DOI: https://doi.org/10.1016/j.carbpol.2018.07.072

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Bacterial biofilms play a key role during infections, which are associated with an increased morbidity and mortality. The classical antibiotic therapy cannot eradicate biofilm-related infections because biofilm bacteria display high drug resistance due to biofilm matrix.

Mesoporous Semiconductors: A New Model To Assess Accessible Surface Area and Increased Photocatalytic Activity?

Alexey S. Cherevan*, Leonie Deilmann, Tobias Weller, Dominik Eder*, Roland Marschall*

ACS Applied Energy Materials 2018, 1, 11, 5787-5799

DOI: https://doi.org/10.1021/acsaem.8b01123

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As accepted article version free to download: [link], [pdf]

Mesoporous photocatalysts have gained tremendous attention in the past decade by demonstrating that increased surface area and porosity can strongly improve their performance. In fact, all reports on mesoporous semiconductors corroborate this scenario. But is it possible to quantify and compare the reported advantages of the mesopores and the increased surface area between different works?

Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver chloride

Marianna V. Kharlamova, Christian Kramberger, Oleg Domanov, Andreas Mittelberger, Kazuhiro Yanagi, Thomas Pichler, Dominik Eder

Journal of Materials Science 2018, 53, 18, 13018-13029

DOI: https://doi.org/10.1007/s10853-018-2575-y

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In the present work, the channels of metallicity-sorted metallic single-walled carbon nanotubes (SWCNTs) have been filled with silver chloride. The data of high-resolution scanning transmission electron microscopy proved the filling of the nanotube channels and formation of few-atom-thick crystals of silver chloride.

Atomic-Scale in Situ Observations of Crystallization and Restructuring Processes in Two-Dimensional MoS2 Films

Bernhard C. Bayer, Reinhard Kaindl, Mohammad Reza Ahmadpour Monazam, Toma Susi, Jani Kotakoski, Tushar Gupta, Dominik Eder, Wolfgang Waldhauser, Jannik C. Meyer

ACS Nano 2018, 12, 8, 8758-8769

DOI: https://doi.org/10.1021/acsnano.8b04945

We employ atomically resolved and element-specific scanning transmission electron microscopy (STEM) to visualize in situ and at the atomic scale the crystallization and restructuring processes of two-dimensional (2D) molybdenum disulfide (MoS2) films. To this end, we deposit a model heterostructure of thin amorphous MoS2 films onto freestanding graphene membranes used as high-resolution STEM supports.

High-efficiency hole-conductor-free rutile TiO2-Nanorod/CH3NH3PbI3 heterojunction solar cells with commercial carbon ink as counter-electrode

Miaomiao Chen, Qiuping Zhang, Li Wan, Yisheng Gan, Zhihui Liu, Yulong Wang, Yue Liu, Jia Wang, Fengxiang Chen, Dominik Eder, Shimin Wang

Solar Energy 2018, 170, 1087-1094

DOI: https://doi.org/10.1016/j.solener.2018.05.049

This work demonstrates the fabrication of a high-efficiency, hole-conductor-free, solid-state perovskite solar cell with TiO2-nanorod arrays (NRAs) as photoanodes and commercial carbon ink as counter-electrodes. TiO2-NRA films of various thicknesses were deposited on FTO electrodes through hydrothermal method for different reaction durations.

How to Evaluate and Manipulate Charge Transfer and Photocatalytic Response at Hybrid Nanocarbon–Metal Oxide Interfaces

Nina Kemnade, Paul Gebhardt, Greta M. Haselmann, Alexey Cherevan, Gerhard Wilde, Dominik Eder

Advanced Functional Materials 2018, 28, 1704730

DOI: dx.doi.org/10.1002/adfm.201704730

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A novel hybrid system enables monitoring and tuning of interfacial charge transfer and manipulation of photocatalytic properties in nanocarbon–inorganic hybrids through implementation of ultrathin dielectric barrier layers using atomic layer deposition. Distance‐dependent quenching studies with solid‐state photoluminescence reveal electron conduction through the barrier layer as the rate‐limiting step.

Influence of Rutile-TiO2 nanorod arrays on Pb-free (CH₃NH₃)₃Bi₂I₉-based hybrid perovskite solar cells fabricated through two-step sequential solution process

Miaomiao Chen, Li Wan, Mengqin Kong, Hang Hu, Yisheng Gan, Jia Wang, Fengxiang Chen, Zhiguang Guo, Dominik Eder, Shimin Wang

Journal of Alloys and Compounds 2018, 738, 422-431

DOI: https://doi.org/10.1016/j.jallcom.2017.12.188

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The organic–inorganic perovskite compound (CH3NH3)3Bi2I9 (MBI) has lower toxicity and higher stability than lead-based perovskite. In this work, we fabricated MBI perovskite-based solar cells (PSCs) through a two-step sequential-solution process by using rutile TiO2 nanorod array (NRA) films as the electron transporting layer (ETL) for the first time.

Ice Nucleation Activity of Graphene and Graphene Oxides

Thomas Häusler, Paul Gebhardt, Daniel Iglesias, Christoph Rameshan, Silvia Marchesan, Dominik Eder, Hinrich Grothe

J. Phys. Chem. C 2018, 122, 15, 8182-8190

DOI: https://doi.org/10.1021/acs.jpcc.7b10675

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Aerosols can act as cloud condensation nuclei and/or ice-nucleating particles (INPs), influencing cloud properties. In particular, INPs show a variety of different and complex mechanisms when interacting with water during the freezing process. To gain a fundamental understanding of the heterogeneous freezing mechanisms, studies with proxies for atmospheric INPs must be performed.

Beware of Doping: Ta2O5 Nanotube Photocatalyst Using CNTs as Hard Templates

Alexey Cherevan*, Paul Gebhart, Andreas Kunzmann, Rubén D. Costa, Dominik Eder*

ACS Appl. Energy Mater. 2018, 1, 3, 1259-1267

DOI: https://doi.org/10.1021/acsaem.8b00006

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As accepted article version free to download: [link], [pdf]

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Nanostructuring constitutes a promising strategy to increase efficiency and stability of contemporary photocatalysts. Here, we report on the synthesis of highly crystalline Ta2O5 nanotubes (NTs) by using carbon nanotubes (CNTs) as sacrificial hard templates and elucidate the role of residual Fe nanoparticles—often used as catalyst for the CNT growth—on their photocatalytic performance toward H2 evolution.

Silver Chloride Encapsulation-Induced Modifications of Raman Modes of Metallicity-Sorted Semiconducting Single-Walled Carbon Nanotubes

Marianna V. Kharlamova, Christian Kramberger, Andreas Mittelberger, Kazuhiro Yanagi, Thomas Pichler, Dominik Eder

Journal of Spectroscopy 2018, Article ID 5987428

DOI: https://doi.org/10.1155/2018/5987428

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The internal channels of semiconducting single-walled carbon nanotubes (SWCNTs) were filled with silver chloride. The filling was confirmed by high-resolution scanning transmission electron microscopy. The filling-induced modifications of Raman modes of SWCNTs were analyzed.

A crystalline and 3D periodically ordered mesoporous quaternary semiconductor for photocatalytic hydrogen generation

Tobias Weller, Leonie Deilmann, Jana Timm, Tobias S. Dörr, Peter A. Beaucage, Alexey S. Cherevan, Ulrich B. Wiesner, Dominik Eder, Roland Marschall

Nanoscale 2018, 10, 3225-3234

DOI: https://doi.org/10.1039/C7NR09251B

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The first crystalline and 3D periodically ordered mesoporous quaternary semiconductor for photocatalystic hydrogen production has been prepared.

Early-Stage Deactivation of Platinum-Loaded TiO2 Using In Situ Photodeposition during Photocatalytic Hydrogen Evolution

Greta M. Haselmann, Dominik Eder

ACS Catal. 2017, 7, 7, 4668-4675

DOI: https://doi.org/10.1021/acscatal.7b00845

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This work unravels a sudden deactivation of Pt/TiO2 (P25) during the initial stages of photocatalytic H2 evolution from aqueous solution that, until now, has gone unnoticed, using a unique combination of in situ photodeposition of Pt with an on-line gas detector system.

2017

Growth, structure and stability of sputter-deposited MoS2 thin films

Reinhard Kaindl, Bernhard C. Bayer, Rolan Resel, Thomas Müller, Viera Skakalova, Gerlinde Habler, Rainer Abart, Alexey S. Cherevan, Dominik Eder, Maxime Blatter, Fabian Fischer, Jannik C. Meyer, Dmitry K. Polyushkin, Wolfgang Waldhauser

Beilstein Jounal of Nanotechnology 2017, 8,1115-1126

DOI: https://doi.org/10.3762/bjnano.8.113

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Molybdenum disulphide (MoS2) thin films have received increasing interest as device-active layers in low-dimensional electronicsand also as novel catalysts in electrochemical processes such as the hydrogen evolution reaction (HER) in electrochemical watersplitting. For both types of applications, industrially scalable fabrication methods with good control over the MoS2 film propertiesare crucial.

Large area photoelectrodes based on hybrids of CNT fibres and ALD-grown TiO2

A. Moya, Nina Kemnade, M. R. Osorio, Alexey Cherevan, D. Granados, Dominik Eder, J. Vilatela

Jounal of materials chemistry A 2017, 5, 47, 24695-24706

DOI: https://doi.org/10.1039/C7TA08074C

Hybridisation is a powerful strategy towards the synthesis of next generation multifunctional materials for environmental and sustainable energy applications. Here, we report a new inorganic/nanocarbon hybrid material prepared by atomically controlled deposition of a monocrystalline TiO2 layer that conformally coats a macroscopic carbon nanotube (CNT) fiber.

Nontoxic (CH₃NH₃)₃Bi₂I₉ perovskite solar cells free of hole conductors with an alternative architectural design and a solution-processable approach

Mengqin Kong, Hang Hu, Li Wan, Miaomiao Chen, Yisheng Gan, Jia Wang, Fengxiang Chen, Binghai Dong, Dominik Eder, Shimin Wang

RSC advances 2017,7,56,35549-35557

DOI: https://doi.org/10.1039/C7RA04924B

2016

Dual Excitation Transient Photocurrent Measurement for Charge Transfer Studies in Nanocarbon Hybrids and Composites

Alexey S. Cherevan, Dominik Eder

Advanced Materials Interfaces 2016, 3, 16, 1600244
DOI: https://doi.org/10.1002/admi.201600244

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As accepted article version free to download: [link], [pdf]

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A new technique, dual excitation transient photocurrent measurement, which enables to deconvolute intrinsic photoresponse of nanocarbons from interfacial charge transfer processes in nanocarbon‐inorganic hybrids and composites, is reported. The technique can be extended to other nanocarbon‐based systems with a wide range of semiconductors and allows quantitative analysis of the charge transfer process.

Atomic Layer Deposition of TiO2 for a High-Efficiency Hole-Blocking Layer in Hole-Conductor-Free Perovskite Solar Cells Processed in Ambient Air

Hang Hu, Binghai Dong, Huating Hu, Fengxiang Chen, Mengqin Kong, Qiuping Zhang, Tianyue Luo, Li Zhao, Zhiguang Guo, Jing Li, Zuxun Xu, Shimin Wang, Dominik Eder, Li Wan

ACS applied materials & interfaces, 8, 28, 17999-18007
DOI: https://doi.org/10.1021/acsami.6b02701

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In this study we design and construct high-efficiency, low-cost, highly stable, hole-conductor-free, solid-state perovskite solar cells, with TiO2 as the electron transport layer (ETL) and carbon as the hole collection layer, in ambient air.

Back Cover: Hierarchical Ternary MoO2/MoS2/Heteroatom‐Doped Carbon Hybrid Materials for High‐Performance Lithium‐Ion Storage

Haidong Liu, Huating Hu, Jun Wang, Philip Niehoff, Xin He, Elie Paillard, Dominik Eder, Martin Winter, Jie Li

ChemElectroChem 2016,3,6,1027
DOI: https://doi.org/10.1002/celc.201600062

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The Back Cover picture illustrates how three components (MoO2/MoS2/heteroatom‐doped carbon) can be hybridized as a novel hierarchical architecture through a one‐pot solvothermal process with the assistance of an ionic liquid and a polymer, which reveals an attractive electrochemical performance for lithium‐ion storage.

Effect of Aluminum Ion Incorporation on the Bioactivity and Structure in Mesoporous Bioactive Glasses

S. Melchers, T. Uesbeck, Oliver Winter, H. Eckert, Dominik Eder

Chem. Mater. 2016, 28, 10, 3254-3264
DOI: https://doi.org/10.1021/acs.chemmater.5b04117

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This work is dedicated to biokinetic and structural investigations of Al2O3 doping (0.5 to 15 mol %) in ordered mesoporous bioactive glasses (MBGs), based on the composition 80% SiO2–15% CaO–5% P2O5 (in mol %).

2015

Ordered gyroidal tantalum oxide photocatalysts: eliminating diffusion limitations and tuning surface barriers

Alexey Cherevan, Spencer Robbins, Dennis Dieterle, Paul Gebhardt, Ulrich Wiesner, Dominik Eder

Nanoscale 2016, 8, 37, 16694-16701
DOI: https://doi.org/10.1039/C6NR04430A

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In this work we synthesized well-ordered, Ta2O5 films with a 3D-interconnected gyroid mesopore architecture with large pore sizes beyond 30 nm and extended crystalline domains through self-assembly of tailor-made triblock-terpolymers.

Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO2 hybrids

Alicia Moya, Alexey Cherevan, Silvia Marchesan, Paul Gebhardt, Maurizio Prato, Dominik Eder, Juan J. Vilatela

Chem. Mater. 2016, 28, 10, 3254-3264
DOI: https://doi.org/10.1016/j.apcatb.2015.05.052
 

We demonstrate a unique route towards hierarchical assemblies of mesoporous TiO2 and CNT/TiO2 photocatalysts by a combination of electrospinning and sol–gel methods. The resulting materials exhibit a mesoporous network of highly crystalline, well-connected inorganic nanocrystals with an order of magnitude higher photocatalytic activity than individualised TiO2 nanoparticles.

Near-Ambient-Pressure X-ray Photoelectron Spectroscopy Study of Methane-Induced Carbon Deposition on Clean and Copper-Modified Polycrystalline Nickel Materials

Raffael Rameshan, Lukas Mayr, Bernhard Klötzer, Dominik Eder, Axel Knop-Gericke, Michael Hävecker, Raoul Blume, Robert Schlögl, Dmitry Y. Zemlyanov, Simon Penner

J. Phys. Chem. C 2015, 119, 48, 26948-26958
DOI:https://doi.org/10.1021/acs.jpcc.5b07317

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In order to simulate solid-oxide fuel cell (SOFC)-related coking mechanisms of Ni, methane-induced surface carbide and carbon growth was studied under close-to-real conditions by synchrotron-based near-ambient-pressure (NAP) X-ray photoelectron spectroscopy (XPS) in the temperature region between 250 and 600 °C.

Going nano with protic ionic liquids—the synthesis of carbon coated Li3V2(PO4)3 nanoparticles encapsulated in a carbon matrix for high power lithium-ion batteries

Xiaofei Zhang, Ruben-Simon Kühnel, Huating Hu, Dominik Eder, Andrea Balducci

Nano Energy 2015, 12, 207-214
DOI: https://doi.org/10.1016/j.nanoen.2014.12.008

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A solution-chemistry approach was developed to prepare carbon-coated Li3V2(PO4)3 nanoparticles embedded in a micrometer-sized carbon matrix. The material was obtained by a facile one-pot synthesis involving a protic ionic liquid as a soft template and carbon source.

Non-destructive functionalisation for atomic layer deposition of metal oxides on carbon nanotubes: effect of linking agents and defects

Nina Kemnade, C. J. Shearer, D. J. Dieterle, Alexey S. Cherevan, Paul Gebhardt, G. Wilde, Dominik Eder

Nanoscale 2015, 7, 3028-3034
DOI: https://doi.org/10.1039/C4NR04615C

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The hybridisation of metal oxides and nanocarbons has created a promising new class of functional materils for environmental and sustainable energy applications.

Biomimetic synthesis and characterization of hydroxyapatite/graphene oxide hybrid coating on Mg alloy with enhanced corrosion resistance

Fang Gao, Chenyang Xu, Huating Hu, Qi Wang, Yuanyang Gao, Hao Chen, Qiannan Guo, Dazhong Chen, Dominik Eder

Materials Letters 2015, 138, 25-28
DOI: https://doi.org/10.1016/j.matlet.2014.09.088

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An effective biomimetic method for preparation of hydroxyapatite/graphene oxide (HA/GO) hybrid coating on AZ91 magnesium alloy was firstly proposed.