0599071 - ÚFCH JH 2025 RIV GB eng J - Journal Article
Sakata, K. - Minhová Macounová, Kateřina - Amemiya, K. - Krtil, Petr
Structural development on Ru and RuO2 electrodes during oxygen evolution – a soft X-ray absorption spectroscopy approach.
Electrochimica acta. Roč. 507, DEC 2024 (2024), č. článku 145066. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GA21-03037S; GA MŠMT(CZ) EH22_008/0004617
Institutional support: RVO:61388955
Keywords : Oxygen evolution * RuO2 * Soft X-ray absorption spectroscopy
OECD category: Physical chemistry
Impact factor: 5.5, year: 2023 ; AIS: 0.861, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1016/j.electacta.2024.145066

Time resolved in-situ X-ray absorption spectroscopy (XAS) in soft X-ray region was used to characterize polarized interphase on Ru and Ru oxide based electrodes under oxygen evolution reaction (OER) conditions. XAS spectra were used to align the type and population of oxygen-containing species formed at electrodes at anodic potentials with local electronic structure of the OER catalyst. The soft XAS data do not identify a single rate limiting process for OER at potentials negative to 1.7 V vs. RHE. Individual intermediates of the oxygen evolution process coexist at the surface at potentials preceding the actual OER onset. The OER is accompanied with redistribution of the electron density resulting for a start of the catalytic cycle reflecting the transfer of the electrons from water to the external circuit during catalyzed water oxidation. The observed spectral behavior indicates a confinement of the OER to the coordination unsaturated sites (cus) at the surface.
Permanent Link: https://hdl.handle.net/11104/0356631