Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 875, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114228
Keywords
Electrochemical double layer; Stern layer; RuO2; Pt(111); Surface X-ray scattering; Surface electrochemistry; Oxygen evolution reaction
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Funding
- U.S. Department of Energy (DOE), Office of Basic Energy Science (BES), Materials Sciences and Engineering Division
- DOE BES Scientific User Facilities Division [DE-AC02-06CH11357]
- grant VEGA [1/0204/18]
- grant of the Slovak Research and Development Agency [APVV-17-0059]
- Skoltech-MIT Center for Electrochemical Energy
- Masdar Institute, Abu Dhabi, UAE [02/MI/MIT/CP/11/07633/GEN/G/00]
- MIT, Cambridge, MA, USA [02/MI/MIT/CP/11/07633/GEN/G/00]
- Japanese Society for the Promotion of Science (JSPS)
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Electrochemical Stern layers are observed on the surfaces of RuO2 single crystals in 0.1 M CsF electrolyte. The Stern layers formed at the interfaces of RuO2 (110) and (100) are compared to the previously reported Stern layer on Pt (111) [Liu et al., J. Phys. Chem. Lett., 9 (2018) 1265]. While the Cs+ density profiles at the potentials close to hydrogen evolution reactions are similar, the hydration layers intervening the surface and the Cs+ layer are significantly denser on RuO2 surfaces than that on Pt(111) surface, reflecting the oxygen termination of RuO2 surfaces. The overall similarities between Stern layers on ruthenium surfaces and platinum surface suggest the universal presence of Stern layers in all well-defined solid-electrolyte interfaces. (C) 2020 Elsevier B.V. All rights reserved.
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