Journal
ELECTROCHIMICA ACTA
Volume 369, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137680
Keywords
3D core-shell structure; Mo-Ni nanoparticles; NiFe LDH; Overall water splitting
Categories
Funding
- National Science Funds of China [12064022]
- Chongqing Natural Science Foundation [cstc2019jcyj-msxm2722, cstc2018jcyjAX0212]
- China Postdoctoral Science Foundation [2019M663575]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN201901349, KJQN202001304]
- Natural Science Foundation of Anhui Province [1908085QE221]
- Natural Science Research Project of Anhui Colleges and Universities [KJ2020A0054]
- Yongchuan Natural Science Foundation [Ycstc,2020nb0601]
- Creative Research Group of Micro-Nano Semiconductor & Photonic Materials of Chongqing Municipal Education Commission
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The study introduces a novel 3D structured NiFe layered double hydroxide nickel judo catalyst and demonstrates its excellent activity and stability in oxygen evolution reaction and hydrogen evolution reaction.
It is still a great challenge to develop efficient and stable monolithic electrocatalysts with effective cost and abundant natural resources. Herein, a 3D structured NiFe layered double hydroxide (NiFeLDH) nanosheets rationally decorated on MoNi/NiMoOx nanowires array supported on Ni foam (MoNi/NiMoOx@NiFe LDH) are fabricated by an in-situ growth process is firstly reported. The results show that MoNi alloys can build a fast electron transport channel, thus improving the efficiency of the electrocatalyst. And the ultrathin NiFe LDH nanosheets would provide abundant exposed defects and catalytic active sites. A low overpotential (278 mV at 100 mA cm(-2)) and Tafel slope (44.7 mV dec(-1)) for oxygen evolution reaction, and overpotential (134 mV at 100 mA cm(-2)) and Tafel slope of 81.0 mV dec(-1) for hydrogen evolution reaction in 1 M KOH can achieved. The overall water splitting system composed with 3D core-shell catalyst (MoNi/NiMoOx@NiFe LDH) and MoNi/NiMoOx nanowire arrays, which can obtain 100 mA cm(-2) at a voltage of 1.64V, even superior to the benchmark of IrO2 (+) // Pt/C (-). (C) 2020 Elsevier Ltd. All rights reserved.
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