Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 38, Pages 11231-11235Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201505320
Keywords
cobalt; exposed polyhedra; nanosheets; spin states; water oxidation
Categories
Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [21401182, 21331005, 11321503, 91422303]
- China Postdoctoral Science Foundation [2014M550347]
- Key Laboratory of Neutron Physics [CAEP 2014DB02]
- Fundamental Research Funds for the Central University [WK2340000063, WK 2060190027]
- Jiangsu Key Laboratory for Environment Functional Materials [SJHG1301]
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Development of efficient and affordable electrocatalysts in neutral solutions is paramount importance for the renewable energy. Herein, we report that the oxygen evolution reaction (OER) performance of Co3S4 under neutral conditions can be enhanced by exposed octahedral planes and self-adapted spin states in atomically thin nanosheets. A HAADF image clearly confirmed that the active octahedra with Jahn-Teller distortions were exposed exclusively. Most importantly, in the atomically thin nanosheets, the spin states of Co3+ in the octahedral self-adapt from low-spin to high-spin states. As a result, the synergistic effect endow the Co3S4 nanosheets with superior OER performance, with exceptional low onset over-potentials of circa 0.31 V in neutral solutions, which is state-of-the- art among inorganic non-noble metal compounds.
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