Mechanism of Hydrogen Evolution Reaction of Ni-Mo-C Alloy Electrode by Electroplating
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摘要: 采用电沉积法在纯铜表面制备Ni-Mo-C合金电极材料,采用线性伏安扫描法(LSV)、循环伏安(CV)和电化学阻抗谱(EIS)等方法对Ni-Mo-C合金在1 mol/L NaOH溶液中的析氢机理进行研究。结果表明:Ni-Mo-C电极表面发生的析氢反应(HER)是分步进行的,即Hads的吸附和脱附,两步反应均为受扩散控制的不可逆反应;C元素可通过抑制Hads的吸附,增强电极对Hads的脱附能力,进而提高合金的析氢性能;高电极电位下,Mo会与Ni发生协同效应,增强合金的析氢性能。Abstract: Ni-Mo-C alloy electrode material was prepared on pure copper by electroplating.Linear sweep voltammetry(LSV),cyclic voltammetry curve(CV) and electrochemical impedance spectroscopy(EIS) were used to investigate reaction mechanism of hydrogen evolution in 1 mol/L NaOH solution.The results show that hydrogen evolution reaction(HER) is a two-step reaction including adsorption and desorption of Hads and HER is irreversible and controlled by the rate of the mass transfer.Carbon can inhibit the adsorption of Hads,enhance desorption property of electrode for Hads and improve the HER property.Mo has hydrogen desorption synergistic effect with Ni when potential is high,which will enhance the property of HER.
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Key words:
- Ni-Mo-C alloy /
- electrode /
- electroplating /
- hydrogen evolution reaction /
- adsorption /
- desorption
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