Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 25, Pages 7399-7404Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502226
Keywords
electrocatalysis; heterogeneous catalysis; oxygen evolution reaction; oxygen vacancies; spinel phases
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Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [21331005, 11321503, 21401181, 91422303]
- China Postdoctoral Science Foundation [BH2060140013]
- Fundamental Research Funds for the Central University [WK2060190032, WK2060190027, WK2340000063]
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Electrochemical water splitting is a clean technology for H-2 fuels, but greatly hindered by the slow kinetics of the oxygen evolution reaction (OER). Herein, a series of spinel-structured nanosheets with oxygen deficiencies and ultrathin thicknesses were designed to increase the reactivity and the number of active sites of the catalysts, which were then taken as an excellent platform for promoting the water oxidation process. Theoretical investigations showed that the oxygen vacancies confined in the ultrathin nanosheet could lower the adsorption energy of H2O, leading to increased OER efficiency. As expected, the NiCo2O4 ultrathin nanosheets rich in oxygen vacancies exhibited a large current density of 285 mAcm(-2) at 0.8V and a small overpotential of 0.32 V, both of which are superior to the corresponding values of bulk samples or samples with few oxygen deficiencies and even higher than those of most reported non-precious-metal catalysts. This work should provide a new pathway for the design of advanced OER catalysts.
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