期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703341
关键词
electronic structure; layered double hydroxides; vanadium doping; water oxidation
类别
资金
- National Natural Science Foundation of China (NSFC)
- National Key Research and Development Project [2016YFF0204402]
- Program for Changjiang Scholars and Innovative Research Team in the University [IRT1205]
- Fundamental Research Funds for the Central Universities
- Long-Term Subsidy Mechanism from the Ministry of Finance
- Ministry of Education of PRC
Binary NiFe layer double hydroxide (LDH) serves as a benchmark non-noble metal electrocatalyst for the oxygen evolution reaction, however, it still needs a relatively high overpotential to achieve the threshold current density. Herein the catalyst's electronic structure is tuned by doping vanadium ions into the NiFe LDHs laminate forming ternary NiFeV LDHs to reduce the onset potential, achieving unprecedentedly efficient electrocatalysis for water oxidation. Only 1.42 V (vs reversible hydrogen electrode (RHE), approximate to 195 mV overpotential) is required to achieve catalytic current density of 20 mA cm(-2) with a small Tafel slope of 42 mV dec(-1) in 1 M KOH solution, which manifests the best of NiFe-based catalysts reported till now. Electrochemical analysis and density functional theory +U simulation indicate that the high catalytic activity of NiFeV LDHs mainly attributes to the vanadium doping which can modify the electronic structure and narrow the bandgap thereby bring enhanced conductivity, facile electron transfer, and abundant active sites.
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