Cost‐effective catalysts for hydrogen evolution reaction (HER) are attractive for sustainable production of H₂ fuel. 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 (η_onset = 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.

中文翻译：

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可调谐的Ni / Fe-Mo碳化物催化剂，对析氢反应具有高活性

具有成本效益的析氢反应（HER）催化剂对于H ₂燃料的可持续生产具有吸引力。在此，通过溶胶-凝胶法和随后的高温碳化过程合成了一系列可调谐的Ni / Fe-Mo碳化物催化剂。调整了Mo ₇ / C前体中的镍和铁含量，实现了用于HER的无贵金属电催化剂的良好性能。正如预期的那样，所设计的Ni ₁₀的Fe ₄沫₇ / C催化剂显示器朝向制氢用超低超电势（η增强的催化活性₁₀ = 110毫伏）和击打动力学（η_发病= 58毫伏，K = 54毫伏·癸^{- 1个}）（1 M KOH），与市售20％Pt / C催化剂相当。镍的这种优异性能₁₀的Fe ₄沫₇ / C可以归因于Ni基合金（的NiMo的高内在活性₄）和Mo ₂ C，以及在钼的晶格收缩₂ c晶胞，在符合其相关电极的高电化学表面积（〜133 m ² ·g ^-1）和低电荷转移电阻（〜31.5Ω）。