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Title: Operando XAS Study of the Surface Oxidation State on a Monolayer IrOx on RuOx and Ru Oxide Based Nanoparticles for Oxygen Evolution in Acidic Media

Journal Article · · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4];  [5]; ORCiD logo [1]; ORCiD logo [6]
  1. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics
  2. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics; Univ. of Copenhagen (Denmark). Dept. of Chemistry; Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis, Dept. of Chemical Engineering
  3. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis, Dept. of Chemical Engineering
  4. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics; Imperial College, London (United Kingdom). Dept. of Materials
  5. Univ. of Copenhagen (Denmark). Dept. of Chemistry
  6. Stockholm Univ. (Sweden). Fysikum

Here in this paper we present surface sensitive operando XAS L-edge measurements on IrOx/RuO2 thin films as well as mass-selected RuOx and Ru nanoparticles. We observed shifts of the white line XAS peak toward higher energies with applied electrochemical potential. Apart from the case of the metallic Ru nanoparticles, the observed potential dependencies were purely core-level shifts caused by a change in oxidation state, which indicates no structural changes. These findings can be explained by different binding energies of oxygenated species on the surface of IrOx and RuOx. Simulated XAS spectra show that the average Ir oxidation state change is strongly affected by the coverage of atomic O. The observed shifts in oxidation state suggest that the surface has a high coverage of O at potentials just below the potential where oxygen evolution is exergonic in free energy. In conclusion, this observation is consistent with the notion that the metal–oxygen bond is stronger than ideal.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union (EU); Villum Foundation; Danish Ministry of Higher Education and Science; Danish Council for Independent Research
Grant/Contract Number:
9455; AC02-76SF00515; 607417
OSTI ID:
1471512
Journal Information:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 122, Issue 2; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Cited By (7)

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Understanding supported noble metal catalysts using first-principles calculations journal November 2019
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Ultrasmall Ru/Cu-doped RuO 2 Complex Embedded in Amorphous Carbon Skeleton as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting journal September 2018
Revealing the structural transformation of rutile RuO 2 via in situ X-ray absorption spectroscopy during the oxygen evolution reaction journal January 2019
Recent Advances on Water‐Splitting Electrocatalysis Mediated by Noble‐Metal‐Based Nanostructured Materials journal November 2019
Charge-Redistribution-Enhanced Nanocrystalline Ru@IrOx Electrocatalysts for Oxygen Evolution in Acidic Media journal February 2019

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