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NiFe double hydroxide coated on sulfur-modified NiMoO4 nanorods as core–shell structured catalysts for the oxygen evolution reaction
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2022-10-26 , DOI: 10.1039/d2se01368a
Mengyang Li 1 , Mingyi Zhang 1 , Xin Chang 1 , Xinyao Ding 1 , Jingbo Mu 2
Affiliation  

The rational development and utilization of inexpensive, highly efficient and stable electrocatalysts are of practical importance for the oxygen evolution reaction (OER) in the process of splitting water. In this paper, a layered core–shell structure of dispersed NiFe layered double hydroxide on S-modified NiMoO4 nanorods (NiFe LDH@S-NiMoO4) grown on nickel foam (NF) was designed by a two-step hydrothermal and electrodeposition method. The constructed electrocatalyst possesses large specific surface area, excellent OER catalytic activity and durability. In 1 M KOH solution, only an overpotential of 277 mV is required at a current density of 100 mA cm−2, and the corresponding Tafel slope is 78 mV dec−1, which verifies the good OER performance. After 3000 cycles of cyclic voltammetry and 70 hours of chronopotentiometry testing, there was no obvious change in overpotential, showing superior durability. Compared with other noble metal OER electrocatalyst materials, NiFe LDH@S-NiMoO4 exhibits more excellent OER performance, providing a new choice for OER catalysts.

中文翻译:

NiFe双氢氧化物涂覆在硫改性的NiMoO4纳米棒上作为析氧反应的核壳结构催化剂

合理开发和利用廉价、高效、稳定的电催化剂对水分解过程中的析氧反应(OER)具有重要的现实意义。在本文中,通过两步水热和电沉积法设计了分散的NiFe层状双氢氧化物在泡沫镍(NF)上生长的S改性NiMoO 4纳米棒(NiFe LDH@S-NiMoO 4 )的层状核壳结构。. 所构建的电催化剂具有较大的比表面积、优异的OER催化活性和耐久性。在 1 M KOH 溶液中,在 100 mA cm -2的电流密度下仅需要 277 mV 的过电位,相应的 Tafel 斜率为 78 mV dec -1,这验证了良好的 OER 性能。经过3000次循环伏安和70小时计时电位测试,过电位无明显变化,表现出优越的耐久性。与其他贵金属OER电催化剂材料相比,NiFe LDH@S-NiMoO 4表现出更优异的OER性能,为OER催化剂提供了新的选择。
更新日期:2022-10-26
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