Electrocatalytic Properties of Ni-Based Alloys Toward Hydrogen Evolution Reaction in Acid Media
Electrocatalytic Properties of Ni-Based Alloys Toward Hydrogen Evolution Reaction in Acid Media
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DOI：
10.1149/1.1561629
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发表时间：
2003-05
影响因子：
3.9
通讯作者：
Guojin Lu;P. Evans;G. Zangari
中科院分区：
文献类型：
--
作者：
Guojin Lu;P. Evans;G. Zangari
采用线性极化、循环伏安和电位阶跃等方法研究了化学沉积制备的一系列镍基合金对析氢反应的电催化性能。Ni-W-P和Ni-Mo-P合金电极对HERS表现出良好的电催化活性，有些Ni-Mo-P合金的性能接近铂箔。镍基合金的电催化活性随P含量的增加而降低，随W或Mo含量的增加而增加。实验结果可以用Ni和W或Mo之间的显著协同作用来解释，Ni有内部配对的d电子，W或Mo有空的或半填充的d轨道，因此，氢原子之间有很强的结合。氢在这些合金中的吸收也被发现对它们的活性有重要的影响。在阴极充电过程中，活性较高的电极能够吸收更多的氢。
The electrocatalytic performance toward the hydrogen evolution reaction (HER) of a series of Ni-based alloys prepared by electroless deposition was studied by means of linear polarization, cyclic voltammetry, and potential step techniques. Ni-W-P and Ni-Mo-P alloy electrodes exhibit good electrocatalytic activity toward HERs, with some Ni-Mo-P alloys approaching the performance of Pt foils. The electrocatalytic activity of Ni-based alloys decreases with increasing P content but increases with increasing content of W or Mo. The experimental results can be interpreted in terms of a pronounced synergy between Ni, which has internally paired d electrons, and W or Mo, which have empty or half-filled d orbitals and therefore, bind hydrogen atoms strongly. The absorption of hydrogen in these alloys is also found to have an important effect on their activity. Electrodes with higher activity are capable to incorporate larger amounts of hydrogen during cathodic charging.