期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 23, 页码 12391-12399出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta11011j
关键词
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资金
- National Natural Science Foundation of China [21633004, 21603098, 51572121, 51872135, 51902137]
- Fundamental Research Funds for the Central Universities [021314380084, 021314380133]
- Natural Science Foundation of Jiangsu Province [BK20151383, BK20150580, BK20151265]
This study demonstrates that constructing Ni3Fe1-xVx/Ni3Fe1-xVxN heterojunctions can optimize the oxygen evolution reaction performance of antiperovskite nitrides, showcasing the coupling of variable-valence metal doping and nanoalloy/nitride heterointerfaces. The electron transfer kinetics during OER are efficiently accelerated by variable-valence V3+/4+ electron acceptor at the core@shell interface and the heterojunction effect in the Ni3Fe1-xVx/Ni3Fe1-xVxN core, leading to low overpotentials for water splitting and a low cell voltage in alkaline electrolyte.
Accelerating electron transfer kinetics is an efficient strategy to tackle the sluggish oxygen evolution reaction (OER). Herein, Ni3Fe1-xVx/Ni3Fe1-xVxN heterojunctions were elaborately constructed to demonstrate that the coupling of variable-valence metal doping and nanoalloy/nitride heterointerfaces could optimize the OER performance of antiperovskite nitrides. The spectroscopic results suggested that during OER electrochemical surface reconstruction occurred to form an assembly of a crystalline Ni3Fe1-xVx/Ni3Fe1-xVxN heterojunction core and amorphous NiFeOOH shell (Ni3Fe1-xVx/Ni3Fe1-xVxN@NiFeOOH). The electron transfer from the OER intermediates via the amorphous NiFeOOH shell was efficiently accelerated by the variable-valence V3+/4+ electron acceptor at the core@shell interface and the heterojunction effect in the Ni3Fe1-xVx/Ni3Fe1-xVxN core. As a result, the oxygen and hydrogen evolution reactions can occur at low overpotentials of 260 mV at 50 mA cm(-2) and 113 mV at 10 mA cm(-2), respectively, affording a low cell voltage of 1.66 V at 10 mA cm(-2) for water splitting in alkaline electrolyte (1.0 M KOH). Our results provide a new attempt at improving water splitting kinetics via the variable-valence ion coupling heterojunction effect.
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