期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100614
关键词
electrocatalysis; in situ reconstruction; NiV oxyhydroxides; oxygen evolution reaction; water splitting
类别
资金
- UNSW Digital Grid Futures Institute
- Mark Wainwright Analytical center (MWAC) at UNSW
- Australian Renewable Energy Agency
- Australian Research Council [FT170100224, DP210103892]
- Australian Synchrotron
- National Natural Science Foundation of China [21873086]
This study reports on the in-situ structural reconstruction of V-doped Ni2P pre-catalyst to form highly active NiV oxyhydroxides for oxygen evolution reaction (OER), showing enhanced kinetics for the adsorption of *OH and deprotonation of *OOH intermediates. Raman spectroscopy and X-ray absorption spectroscopy demonstrate that the increased content of the active beta-NiOOH phase contributes to OER activity enhancement. Density functional theory calculations verify that the V dopants facilitate the generation of *O intermediates during OER.
Nickel-based electrocatalysts are promising candidates for oxygen evolution reaction (OER) but suffer from high activation overpotentials. Herein, in situ structural reconstruction of V-doped Ni2P pre-catalyst to form highly active NiV oxyhydroxides for OER is reported, during which the partial dissolution of V creates a disordered Ni structure with an enlarged electrochemical surface area. Operando electrochemical impedance spectroscopy reveals that the synergistic interaction between the Ni hosts and the remaining V dopants can regulate the electronic structure of NiV oxyhydroxides, which leads to enhanced kinetics for the adsorption of *OH and deprotonation of *OOH intermediates. Raman spectroscopy and X-ray absorption spectroscopy further demonstrate that the increased content of active beta-NiOOH phase with the disordered Ni active sites contributes to OER activity enhancement. Density functional theory calculations verify that the V dopants facilitate the generation of *O intermediates during OER, which is the rate-determining step for realizing efficient O-2 evolution. Optimization of these properties endows the NiV oxyhydroxide electrode with a low overpotential of 221 mV to deliver a current density of 10 mA cm(-2) and excellent stability in the alkaline electrolyte.
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