Journal
ADVANCED MATERIALS
Volume 29, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701687
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Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [U1532265, U1632149, 21401181, 21331005, 11621063]
- Youth Innovation Promotion Association of CAS [2017493]
- Fundamental Research Funds for the Central University [WK2340000063]
- Key Research Program of Frontier Sciences [QYZDY-SSW-SLH011]
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The electrocatalytic activity of transition-metal-based compounds is strongly related to the spin states of metal atoms. However, the ways for regulation of spin states of catalysts are still limited, and the underlying relationship between the spin states and catalytic activities remains unclear. Herein, for the first time, by taking Ni-II-based compounds without high or low spin states for example, it is shown that their spin states can be delocalized after introducing structural distortion to the atomic layers. The delocalized spin states for Ni atoms can provide not only high electrical conductivity but also low adsorption energy between the active sites and reaction intermediates for the system. As expected, the ultrathin nanosheets of nickel-chalcogenides with structural distortions show dramatically enhanced activity in electrocatalytic oxygen evolution compared to their corresponding bulk samples. This work establishes new way for the design of advanced electrocatalysts in transitionmetal- based compounds via regulation of spin states.
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