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RuS2 thin films as oxygen-evolving electrocatalyst: Highly oriented growth on single-crystal FeS2 substrate and their properties compared to polycrystalline layers

Kratzig, Andreas; Zachaeus, Carolin; Brunken, Stephan; Thomas, Diana LU ; Bogdanoff, Peter; Ellmer, Klaus and Fiechter, Sebastian (2014) In Physica Status Solidi. A: Applications and Materials Science 211(9). p.2020-2029
Abstract
The compound semiconductor RuS2, known as mineral laurite, has been investigated as a potential (photo) electrochemically active anode material for the oxygen evolution in the process of (photo) electrolytic water splitting. The contribution describes for the first time the preparation of RuS2 thin films deposited on (100)- and (111)-oriented FeS2 (pyrite) substrates using reactive magnetron sputtering. The epitaxial growth of 60 nm thick films was confirmed by X-ray diffractometry, texture measurements, and the evaluation of cross section transmission electron micrographs. By optical reflectance spectroscopy and Seebeck coefficient measurements a direct band gap of 1.9 eV and p-type conductivity could be determined. Due to the modest... (More)
The compound semiconductor RuS2, known as mineral laurite, has been investigated as a potential (photo) electrochemically active anode material for the oxygen evolution in the process of (photo) electrolytic water splitting. The contribution describes for the first time the preparation of RuS2 thin films deposited on (100)- and (111)-oriented FeS2 (pyrite) substrates using reactive magnetron sputtering. The epitaxial growth of 60 nm thick films was confirmed by X-ray diffractometry, texture measurements, and the evaluation of cross section transmission electron micrographs. By optical reflectance spectroscopy and Seebeck coefficient measurements a direct band gap of 1.9 eV and p-type conductivity could be determined. Due to the modest electrochemical stability of the epitaxial layers in electrochemical investigations, polycrystalline films of laurite were also deposited on Ti sheets and Si wafers. As a function of grain size, [S]:[Ru] ratio and grain orientation highest activity towards oxygen evolution was found when the conditions were fulfilled that the layer composition was close to stoichiometry and increased particle sizes showed a strong texture in the grains. Some structural and chemical properties argue for the (100) surface as catalytically active and stable layer compared to other surfaces. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
electrocatalysis, electrochemistry, magnetron sputtering, oxygen, remission spectroscopy, RuS2
in
Physica Status Solidi. A: Applications and Materials Science
volume
211
issue
9
pages
2020 - 2029
publisher
Wiley-Blackwell
external identifiers
  • wos:000341988400011
  • scopus:85027955760
ISSN
1862-6300
DOI
10.1002/pssa.201431284
language
English
LU publication?
yes
id
bea6bc8e-45a4-4a93-a080-09c750930259 (old id 4706719)
date added to LUP
2014-10-23 11:29:34
date last changed
2017-10-01 03:07:02
@article{bea6bc8e-45a4-4a93-a080-09c750930259,
  abstract     = {The compound semiconductor RuS2, known as mineral laurite, has been investigated as a potential (photo) electrochemically active anode material for the oxygen evolution in the process of (photo) electrolytic water splitting. The contribution describes for the first time the preparation of RuS2 thin films deposited on (100)- and (111)-oriented FeS2 (pyrite) substrates using reactive magnetron sputtering. The epitaxial growth of 60 nm thick films was confirmed by X-ray diffractometry, texture measurements, and the evaluation of cross section transmission electron micrographs. By optical reflectance spectroscopy and Seebeck coefficient measurements a direct band gap of 1.9 eV and p-type conductivity could be determined. Due to the modest electrochemical stability of the epitaxial layers in electrochemical investigations, polycrystalline films of laurite were also deposited on Ti sheets and Si wafers. As a function of grain size, [S]:[Ru] ratio and grain orientation highest activity towards oxygen evolution was found when the conditions were fulfilled that the layer composition was close to stoichiometry and increased particle sizes showed a strong texture in the grains. Some structural and chemical properties argue for the (100) surface as catalytically active and stable layer compared to other surfaces. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim},
  author       = {Kratzig, Andreas and Zachaeus, Carolin and Brunken, Stephan and Thomas, Diana and Bogdanoff, Peter and Ellmer, Klaus and Fiechter, Sebastian},
  issn         = {1862-6300},
  keyword      = {electrocatalysis,electrochemistry,magnetron sputtering,oxygen,remission spectroscopy,RuS2},
  language     = {eng},
  number       = {9},
  pages        = {2020--2029},
  publisher    = {Wiley-Blackwell},
  series       = {Physica Status Solidi. A: Applications and Materials Science},
  title        = {RuS2 thin films as oxygen-evolving electrocatalyst: Highly oriented growth on single-crystal FeS2 substrate and their properties compared to polycrystalline layers},
  url          = {http://dx.doi.org/10.1002/pssa.201431284},
  volume       = {211},
  year         = {2014},
}