Tunable Ni/Fe-Mo carbide catalyst with high activity toward hydrogen evolution reaction
Tunable Ni/Fe-Mo carbide catalyst with high activity toward hydrogen evolution reaction
复制标题
对析氢反应具有高活性的可调 Ni/Fe-Mo 碳化物催化剂
DOI：
10.1002/cjce.23732
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发表时间：
2020
影响因子：
2.1
通讯作者：
Kang Zhenhui
中科院分区：
文献类型：
--
作者：
Wang Channa;Li Ling;Wang Huihua;Qu Tianpeng;Tian Jun;Wang Deyong;Kang Zhenhui
具有成本效益的析氢反应（HER）催化剂对于可持续生产H2燃料具有吸引力。本文中，通过溶胶-凝胶法结合随后的高温碳化过程合成了一系列可调的Ni/Fe-Mo碳化物催化剂。通过对Mo 7/C前驱体中Ni和Fe的含量进行调整，实现了无贵金属的HER电催化剂的良好性能。正如预期的那样，所设计的Ni 10 Fe 4 Mo 7/C催化剂在超低过电位下显示出增强的制氢催化活性（η10= 110 mV）和起弧动力学（ηonset= 58 mV，k = 54 mV · dec-1），其与商业20% Pt/C催化剂的那些相当。Ni 10 Fe 4 Mo 7/C的优异性能可归因于Ni基合金（NiMo 4）和Mo 2C的高本征活性，以及Mo 2C晶胞中的晶格收缩，这与其高电化学表面积（~133 m2· g−1）和相关电极的低电荷转移电阻（~31.5 Ω）一致。
Cost‐effective catalysts for hydrogen evolution reaction (HER) are attractive for sustainable production of H2fuel. Herein, a series of tunable Ni/Fe‐Mo carbide catalysts have been synthesized via a sol‐gel method coupling with a subsequent high temperature carbonization process. The amount of nickel and iron was tuned in the Mo7/C precursors, accomplishing a favourable performance of noble‐metal‐free electrocatalysts for HER. As expected, the designed Ni10Fe4Mo7/C catalyst displays an enhanced catalytic activity toward hydrogen production with an ultralow overpotential (η10= 110 mV) and striking kinetics (ηonset= 58 mV, k = 54 mV · dec−1) in the alkaline electrolyte (1 M KOH), which are comparable to those of the commercial 20% Pt/C catalyst. Such excellent performance of Ni10Fe4Mo7/C could be attributed to the high intrinsic activities of Ni‐based alloys (NiMo4) and Mo2C, as well as to the lattice contraction in the Mo2C unit cell, in accordance with its high electrochemical surface area (~133 m2· g−1) and low charge‐transfer resistance (~31.5 Ω) for the associated electrode.