期刊
SMALL
卷 16, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202003824
关键词
electrocatalysis; Fe3N; nanotubes; oxygen evolution reaction; self-reconstruction
类别
资金
- Natural Science Foundation of Excellent Young Scholars for Shanxi Province [201901D211198]
- Foundation of State Key Laboratory of Coal Conversion [J18-19-903]
- Fund for Shanxi 1331 Project Key Innovative Research Team (1331KIRT) [TD201704]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT) [231544901002]
- Fund for Shanxi 1331 Project for Featured Discipline of Chemistry in SXNU
- Analytical Instrumentation Center, SPST, ShanghaiTech University [SPST-AIC10112914]
The surface reconstruction of oxygen evolution reaction (OER) catalysts has been proven favorable for enhancing its catalytic activity. However, what is the active site and how to promote the active species generation remain unclear and are still under debate. Here, the in situ synthesis of CoNi incorporated Fe3N nanotubes (CoNi-Fe3N) on the iron foil through the anodization/electrodeposition/nitridation process for use of boosted OER catalysis is reported. The synergistic CoNi doping induces the lattice expansion and up shifts the d-band center of Fe3N, which enhances the adsorption of hydroxyl groups from electrolyte during the OER catalysis, facilitating the generation of active CoNi-FeOOH on the Fe3N nanotube surface. As a result of this OER-conditioned surface reconstruction, the optimized catalyst requires an overpotential of only 285 mV at a current density of 10 mA cm(-2)with a Tafel slope of 34 mV dec(-1), outperforming commercial RuO(2)catalysts. Density functional theory (DFT) calculations further reveal that the Ni site in CoNi-FeOOH modulates the adsorption of OER intermediates and delivers a lower overpotential than those from Fe and Co sites, serving as the optimal active site for excellent OER performance.
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