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Influence of Electrolyte Cations on Ni(Fe)OOH Catalyzed Oxygen Evolution Reaction
- Source :
- Chemistry of Materials. 29:4761-4767
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- Iron-doped, nickel oxyhydroxide (Ni(Fe)OOH) is one of the best catalysts for the oxygen evolution reaction (OER) under alkaline conditions. Due to Ni(Fe)OOH’s layered structure, electrolyte species are able to easily intercalate between the octahedrally coordinated sheets. Electrolyte cations have long been considered inert spectator ions during electrocatalysis, but electrolytes that penetrate into the catalyst may play a major role in the reaction process. In a joint theoretical and experimental study, we report the role of electrolyte counterions (K+, Na+, Mg2+, and Ca2+) on Ni(Fe)OOH catalytic activity in alkaline media. We show that electrolytes containing alkali metal cations (Na+ and K+) yield dramatically lower overpotentials than those with alkaline earth cations (Mg2+ and Ca2+). K+ and Na+ lower the overpotential because they have an optimal acidity and size that allows them to not bind too strongly or alter the stability of reaction intermediates. These two features required for intercalated ca...
- Subjects :
- inorganic chemicals
Chemistry
General Chemical Engineering
Inorganic chemistry
Oxygen evolution
02 engineering and technology
General Chemistry
Reaction intermediate
Electrolyte
Overpotential
010402 general chemistry
021001 nanoscience & nanotechnology
Alkali metal
01 natural sciences
0104 chemical sciences
Catalysis
Spectator ion
Materials Chemistry
Qualitative inorganic analysis
0210 nano-technology
Subjects
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........dca1209c9821c2ef10b63273f50f42a7