期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202102918
关键词
active sites; metal xides; non-precious metal catalysts; oxygen evolution reaction; pre-catalysts
类别
资金
- National Natural Science Foundation of China [51803042, 21805064]
Research indicates that metal Xides, as catalysts for oxygen evolution reaction, may transform into oxides and (oxy)hydroxides in the OER environment, serving as the real active sites rather than the Xides themselves.
Non-precious metal-based catalysts for oxygen evolution reaction (OER) have been extensively studied, among which the transition metal X-ides (including phosph-ides, sulf-ides, nitr-ides, and carb-ides) materials are emerging as promising candidates to replace the benchmark Ir/Ru-based materials in alkaline media. However, it is controversial whether the metal Xides host the real active sites since these metal Xides are thermodynamically unstable under a harsh OER environment-it has been reported that the initial metal Xides can be electrochemically oxidized and transformed into corresponding oxides and (oxy)hydroxides. Therefore, the metal Xides are argued as pre-catalysts; the electrochemically formed oxides and (oxy)hydroxides are believed as the real active moieties for OER. Herein, the recent advances in understanding the transformation behavior of metal Xides during OER are re-looked; importantly, hypotheses are provided to understand why the electrochemically formed oxides and (oxy)hydroxides catalysts derived from metal Xides are superior for OER to the as-prepared metal oxides and (oxy)hydroxides catalysts.
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