期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 266, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118627
关键词
Nickel iron layered double hydroxide; Hydrogen evolution reaction; Overall water splitting; Doping; Reduction
资金
- Zhejiang Provincial Natural Science Foundation of China [LY18B030002]
- Anhui Provincial Supporting Program for Excellent Young Talents in Universities [gxyqZD2019005]
- Innovation and Entrepreneurship Project of Overseas Returnees in Anhui Province [2019LCX018]
- Hundred Talents Program of Zhejiang University
NiFe layered double hydroxides (LDHs) have been intensively investigated as promising electrocatalysts for oxygen evolution reaction. However, their hydrogen evolution reaction (HER) and overall water splitting performance are not satisfactory. Herein, we report a facile cation doping combined with plasma reduction strategy to generate heterostructured Ni nanoparticles/V-doped NiFe LDH nanosheet array with multiple vacancies, exhibiting excellent HER performance with a small overpotential of 19 mV at 10 mA cm(-2). Moreover, when evaluated as bi-functional electrocatalyst for overall water splitting, a small cell voltage (1.43 V at 10 mA cm(-2)) and ultralong stability (over 1000 h) are achieved. Density functional theory (DFT) calculations reveal that V-doping, oxygen vacancy (O-v) Ni vacancy (Ni-v), and Ni nanoparticles can effectively improve the conductivity and optimize the hydrogen adsorption, O-v, Ni-v, and Ni nanoparticles help to facilitate H2O adsorption and dissociation progress in HER, the V-doping and O-v, can efficiently reduce the energy barrier of O* in OER, and Ni/NiFe LDH heterostructure ameliorates the electronic structure and tunes electron transfer route.
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