期刊
CHEMSUSCHEM
卷 11, 期 6, 页码 1020-1024出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201702371
关键词
electrocatalysis; doping; metal oxides; nickel; surface chemistry
资金
- National Natural Science Foundation of China [21573068]
- National Natural Science Funds for Distinguished Young Scholar [51725201]
- SRF for ROCS, SEM, Fundamental Research Funds for the Central Universities [222201718002, 222201714001, WD1514003]
- China Postdoctoral Science Foundation Funded Project [2016M601523]
- National Postdoctoral Program for Innovative Talents [BX201600050]
- Program of Shanghai Subject Chief Scientist [15XD1501300]
- Shanghai Sailing Program [17YF1402900]
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [13CG27, 16CG31]
Boosting the sluggish kinetics of the hydrogen evolution reaction in alkaline environments is key for the large-scale application of water-alkali and chlor-alkali electrolysis. In this study, nitrogen atoms are used to precisely modulate electrochemical active sites on the surface of nickel oxide with low-coordinated oxygen atoms, to achieve enhanced kinetics in alkaline hydrogen evolution. Theoretical and experimental results demonstrate that surface charge redistribution after modulation facilitates both the initial water dissociation step and the subsequent recombination of H-ad from low-coordinated oxygen sites and desorption of OHad- from nickel sites, thus accelerating the overall hydrogen evolution process. The N-modulated nickel oxide enriched in low-coordinated oxygen atoms exhibits significantly enhanced activity with a small overpotential of -100 mV at the current density of -10 mA cm(-2) and a robust stability over 90 h for hydrogen evolution in 1.0 m KOH.
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