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Article ; Online: Impact of Catalysis-Relevant Oxidation and Annealing Treatments on Nanostructured GaRh Alloys.

Hsieh, Tzung-En / Frisch, Johannes / Wilks, Regan G / Papp, Christian / Bär, Marcus

ACS applied materials & interfaces

2024 Volume 16, Issue 15, Page(s) 19858–19865

Abstract: In this study, we examine the surface-derived electronic and chemical structures of nanostructured GaRh alloys as a model system for supported catalytically active liquid metal solutions (SCALMS), a novel catalyst candidate for dehydrogenation reactions ... ...

Abstract	In this study, we examine the surface-derived electronic and chemical structures of nanostructured GaRh alloys as a model system for supported catalytically active liquid metal solutions (SCALMS), a novel catalyst candidate for dehydrogenation reactions that are important for the petrochemical and hydrogen energy industry. It is reported that under ambient conditions, SCALMS tends to form a gallium oxide shell, which can be removed by an activation treatment at elevated temperatures and hydrogen flow to enhance the catalytic reactivity. We prepared a 7 at. % Rh containing the GaRh sample and interrogated the evolution of the surface chemical and electronic structure by photoelectron spectroscopy (complemented by scanning electron microscopy) upon performing surface oxidation and (activation treatment mimicking) annealing treatments in ultrahigh vacuum conditions. The initially pronounced Rh 4d and Fermi level-derived states in the valence band spectra disappear upon oxidation (due to formation of a GaO
Language	English
Publishing date	2024-04-09
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.4c02286
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Unravelling the Surface Oxidation-Induced Evolution of the Electronic Structure of Gallium.

Hsieh, Tzung-En / Frisch, Johannes / Wilks, Regan G / Bär, Marcus

ACS applied materials & interfaces

2023 Volume 15, Issue 40, Page(s) 47725–47732

Abstract: Gallium is widely used in liquid metal catalyst fabrication, and its oxidized species is a well-known dielectric material. In the past decades, these two species have been well studied separately. However, the surface oxide layer-induced impact on the ... ...

Abstract	Gallium is widely used in liquid metal catalyst fabrication, and its oxidized species is a well-known dielectric material. In the past decades, these two species have been well studied separately. However, the surface oxide layer-induced impact on the chemical and electronic structure of (liquid) gallium is still mostly unclear because of the extreme fast formation of thermodynamically stable surface Ga
Language	English
Publishing date	2023-09-29
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.3c09324
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Species- and sex-dependent changes in body size between 1892 and 2017, and recent biochemical signatures in rural and urban populations of two ground beetle species.

Keinath, Silvia / Frisch, Johannes / Müller, Johannes / Mayer, Frieder / Struck, Ulrich / Rödel, Mark-Oliver

Ecology and evolution

2023 Volume 13, Issue 7, Page(s) e10329

Abstract: Increasing urbanisation and intensified agriculture lead to rapid transitions of ecosystems. Species that persist throughout rapid transitions may respond to environmental changes across space and/or time, for instance by altering morphological and/or ... ...

Abstract	Increasing urbanisation and intensified agriculture lead to rapid transitions of ecosystems. Species that persist throughout rapid transitions may respond to environmental changes across space and/or time, for instance by altering morphological and/or biochemical traits. We used natural history museum specimens, covering the Anthropocene epoch, to obtain long-term data combined with recent samples. We tested whether rural and urban populations of two ground beetle species,
Language	English
Publishing date	2023-07-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2635675-2
ISSN	2045-7758
ISSN	2045-7758
DOI	10.1002/ece3.10329
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Book ; Online ; Thesis: Electronic properties of interfaces in polymer based organic photovoltaic cells

Frisch, Johannes

2014

Author's details	von Johannes Frisch
Language	English
Size	Online-Ressource, Ill., graph. Darst.
Document type	Book ; Online ; Thesis
Thesis / German Habilitation thesis	Humboldt-Univ., Diss.--Berlin, 2014
Database	Former special subject collection: coastal and deep sea fishing

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Article ; Online: The Steninae MacLeay, 1825 (Coleoptera: Staphylinidae) of Iran: identification key, checklist of species and a new synonymy.

Serri, Sayeh / Frisch, Johannes

Zootaxa

2016 Volume 4168, Issue 3, Page(s) 453–480

Abstract: In this contribution to the knowledge of the Steninae MacLeay, 1825 of Iran we present an identification key to the 69 species known to occur in this country, which includes illustrations of the diagnostic genital characters of all species involved. The ... ...

Abstract	In this contribution to the knowledge of the Steninae MacLeay, 1825 of Iran we present an identification key to the 69 species known to occur in this country, which includes illustrations of the diagnostic genital characters of all species involved. The endophallic characters of the aedeagus of several Iranian species of Stenus Latreille, 1797 are illustrated for the first time. A critical checklist of the Steninae of Iran is presented at the province level. Stenus alanorum Ryvkin, 1990 is synonymized with S. medus Puthz, 1981.
MeSH term(s)	Animal Distribution ; Animal Structures/anatomy & histology ; Animal Structures/growth & development ; Animals ; Body Size ; Checklist ; Coleoptera/anatomy & histology ; Coleoptera/classification ; Coleoptera/growth & development ; Ecosystem ; Female ; Iran ; Male ; Organ Size
Language	English
Publishing date	2016-09-16
Publishing country	New Zealand
Document type	Journal Article
ISSN	1175-5334
ISSN (online)	1175-5334
DOI	10.11646/zootaxa.4168.3.2
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Article ; Online: Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae: Diplotaxini) from the Chacoan Province and its boundaries: taxonomic overview with four new species.

Cherman, Mariana Alejandra / Basílio, Daniel Silva / Mise, Kleber Makoto / Frisch, Johannes / DE Almeida, Lúcia Massutti

Zootaxa

2021 Volume 4938, Issue 1, Page(s) zootaxa.4938.1.1

Abstract: A taxonomic revision of the Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae: Diplotaxini) from the Chacoan Biogeographical Province is presented. Liogenys now includes 92 species, including four new species described here: L. ... ...

Abstract	A taxonomic revision of the Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae: Diplotaxini) from the Chacoan Biogeographical Province is presented. Liogenys now includes 92 species, including four new species described here: L. neoforcipata Cherman, new species; L. foveata Cherman, new species; L. isotarsis Cherman, new species; and L. truncata Cherman, new species; and the female of L. tarsalis Moser is described for the first time. Six new synonymies are proposed: L. denticulata Moser, 1918 is a new synonym of L. denticeps Blanchard, 1851; L. ophtalmica Frey, 1973 is a new synonym of L. bidenticeps Moser, 1919; L. mendozana incisa Frey, 1969 is a new synonym of L. mendozana Moser, 1918; L. flavicollis Blanchard, 1851 and L. fulvescens Blanchard, 1851 are new synonyms of L. pallens Blanchard, 1851; and L. densicollis Moser, 1921 is a new synonym of L. opacicollis Fairmaire, 1892. Liogenys cribricollis Moser, 1921 species status is revalidated from its synonymy with L. densicollis. A neotype is designated for Liogenys mendozana incisa Frey, 1969, as well as lectotypes for: L. bruchi Moser, 1924; L. cribricollis, L. denticulata, L. denticeps, L. fulvescens, L. latitarsis Moser, 1918; L. mendozana Moser, 1918; L. obscura Blanchard, 1851; L. opacicollis; and L. pallens. Redescriptions and/or diagnoses and updated geographical distributions are provided for 16 species. Six species previously known only from Argentina have their distribution expanded to Bolivia (L. mendozana; L. opacicollis; L. rectangula Frey, 1969), Paraguay (L. nigrofusca Moser, 1918; L. pallens), or to both of these countries (L. latitarsis).
MeSH term(s)	Animals ; Coleoptera ; Female
Language	English
Publishing date	2021-02-25
Publishing country	New Zealand
Document type	Journal Article
ISSN	1175-5334
ISSN (online)	1175-5334
DOI	10.11646/zootaxa.4938.1.1
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Article: In situ surface-enhanced Raman scattering shows ligand-enhanced hot electron harvesting on silver, gold, and copper nanoparticles

Zhang, Zhiyang / Li, Yawei / Frisch, Johannes / Bär, Marcus / Rappich, Jörg / Kneipp, Janina

Journal of catalysis. 2020 Mar., v. 383

2020

Abstract: Hot carriers (electrons and holes) generated from the decay of localized surface plasmon resonances can take a major role in catalytic reactions on metal nanoparticles. By obtaining surface enhanced Raman scattering (SERS) spectra of p-aminothiophenol as ...

Abstract	Hot carriers (electrons and holes) generated from the decay of localized surface plasmon resonances can take a major role in catalytic reactions on metal nanoparticles. By obtaining surface enhanced Raman scattering (SERS) spectra of p-aminothiophenol as product of the reduction of p-nitrothiophenol by hot electrons, different catalytic activity is revealed here for nanoparticles of silver, gold, and copper. As a main finding, a series of different ligands, comprising halide and non-halide species, are found to enhance product formation in the reduction reaction on nanoparticles of all three metals. A comparison with the standard electrode potentials of the metals with and without the ligands and SERS data obtained at different electrode potential indicate that the higher catalytic activity can be associated with a higher Fermi level, thereby resulting in an improved efficiency of hot carrier generation. The concept of such a ligand-enhanced hot electron reduction provides a way to make light-to-chemical energy conversion more efficient due to improved electron harvesting.
Keywords	Raman spectroscopy ; catalytic activity ; copper ; copper nanoparticles ; electrodes ; electrons ; energy conversion ; harvesting ; ligands ; nanogold ; nanosilver ; surface plasmon resonance
Language	English
Dates of publication	2020-03
Size	p. 153-159.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	1468993-5
ISSN	1090-2694 ; 0021-9517
ISSN (online)	1090-2694
ISSN	0021-9517
DOI	10.1016/j.jcat.2020.01.006
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Prospect of making XPS a high-throughput analytical method illustrated for a Cu

Bodenstein-Dresler, Lucas C W / Kama, Adi / Frisch, Johannes / Hartmann, Claudia / Itzhak, Anat / Wilks, Regan G / Cahen, David / Bär, Marcus

RSC advances

2022 Volume 12, Issue 13, Page(s) 7996–8002

Abstract: Combinatorial material science crucially depends on robust, high-throughput characterization methods. While X-ray photoelectron spectroscopy (XPS) may provide detailed information about chemical and electronic properties, it is a time-consuming technique ...

Abstract	Combinatorial material science crucially depends on robust, high-throughput characterization methods. While X-ray photoelectron spectroscopy (XPS) may provide detailed information about chemical and electronic properties, it is a time-consuming technique and, therefore, is not viewed as a high-throughput method. Here we present preliminary XPS data of 169 measurement spots on a combinatorial 72 × 72 cm
Language	English
Publishing date	2022-03-11
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d1ra09208a
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Article: Prospect of making XPS a high-throughput analytical method illustrated for a CuₓNi₁₋ₓOy combinatorial material library

Bodenstein-Dresler, Lucas C. W. / Kama, Adi / Frisch, Johannes / Hartmann, Claudia / Itzhak, Anat / Wilks, Regan G. / Cahen, David / Bär, Marcus

RSC advances. 2022 Mar. 11, v. 12, no. 13

2022

Abstract	Combinatorial material science crucially depends on robust, high-throughput characterization methods. While X-ray photoelectron spectroscopy (XPS) may provide detailed information about chemical and electronic properties, it is a time-consuming technique and, therefore, is not viewed as a high-throughput method. Here we present preliminary XPS data of 169 measurement spots on a combinatorial 72 × 72 cm² CuₓNi₁₋ₓOy compositional library to explore how characterization and evaluation routines can be optimized to improve throughput in XPS for combinatorial studies. In particular, two quantification approaches are compared. We find that a simple integration (of XPS peak regions) approach is suited for fast evaluation of, in the example system, the [Cu]/([Cu] + [Ni]) ratio. Complementary to that, the time-consuming (XPS peak-) fit approach provides additional insights into chemical speciation and oxidation state changes, without a large deviation of the [Cu]/([Cu] + [Ni]) ratio. This insight suggests exploiting the fast integration approach for ‘real time’ analysis during XPS data collection, paving the way for an ‘on-the-fly’ selection of points of interest (i.e., areas on the sample where sudden composition changes have been identified) for detailed XPS characterization. Together with the envisioned improvements when going from laboratory to synchrotron-based excitation sources, this will shorten the analysis time sufficiently for XPS to become a realistic characterization option for combinatorial material science.
Keywords	X-ray photoelectron spectroscopy ; chemical speciation ; data collection ; materials science ; oxidation
Language	English
Dates of publication	2022-0311
Size	p. 7996-8002.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/d1ra09208a
Database	NAL-Catalogue (AGRICOLA)

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Article: Origin of Interface Limitation in Zn(O,S)/CuInS₂-Based Solar Cells

Sood, Mohit / Bombsch, Jakob / Lomuscio, Alberto / Shukla, Sudhanshu / Hartmann, Claudia / Frisch, Johannes / Bremsteller, Wolfgang / Ueda, Shigenori / Wilks, Regan G. / Bär, Marcus / Siebentritt, Susanne

ACS applied materials & interfaces. 2022 Feb. 08, v. 14, no. 7

2022

Abstract: Copper indium disulfide (CuInS₂) grown under Cu-rich conditions exhibits high optical quality but suffers predominantly from charge carrier interface recombination, resulting in poor solar cell performance. An unfavorable “cliff”-like conduction band ... ...

Abstract	Copper indium disulfide (CuInS₂) grown under Cu-rich conditions exhibits high optical quality but suffers predominantly from charge carrier interface recombination, resulting in poor solar cell performance. An unfavorable “cliff”-like conduction band alignment at the buffer/CuInS₂ interface could be a possible cause of enhanced interface recombination in the device. In this work, we exploit direct and inverse photoelectron spectroscopy together with electrical characterization to investigate the cause of interface recombination in chemical bath-deposited Zn(O,S)/co-evaporated CuInS₂-based devices. Temperature-dependent current–voltage analyses indeed reveal an activation energy of the dominant charge carrier recombination path, considerably smaller than the absorber bulk band gap, confirming the dominant recombination channel to be present at the Zn(O,S)/CuInS₂ interface. However, photoelectron spectroscopy measurements indicate a small (0.1 eV) “spike”-like conduction band offset at the Zn(O,S)/CuInS₂ interface, excluding an unfavorable energy-level alignment to be the prominent cause for strong interface recombination. The observed band bending upon interface formation also suggests Fermi-level pinning not to be the main reason, leaving near-interface defects (as recently observed in Cu-rich CuInSe₂) as the likely reason for the performance-limiting interface recombination.
Keywords	activation energy ; disulfides ; indium ; solar cells ; spectroscopy
Language	English
Dates of publication	2022-0208
Size	p. 9676-9684.
Publishing place	American Chemical Society
Document type	Article
ISSN	1944-8252
DOI	10.1021/acsami.1c19156
Database	NAL-Catalogue (AGRICOLA)

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