Electrodeposited Ni-Fe-C cathodes for hydrogen evolution
Electrodeposited Ni-Fe-C cathodes for hydrogen evolution
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DOI：
10.1149/1.1393639
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发表时间：
2000-08-01
影响因子：
3.9
通讯作者：
Hashimoto, K
中科院分区：
文献类型：
--
作者：
Meguro, S;Sasaki, T;Hashimoto, K
尝试通过电沉积来定制在热浓氢氧化物溶液中析氢的活性镍合金阴极。电沉积铁自然比镍更具有析氢活性，但镍铁合金表现出更高的析氢活性，尽管假设为质子放电的速率决定步骤没有改变。在铁或镍中添加碳显着增强了析氢活性并改变了析氢机制。三元Ni-Fe-C合金表现出最高的析氢活性，析氢Tafel斜率约为33 mV/dec，表明吸附氢通过重组解吸的速率决定步骤。 XPS 分析表明，合金中发生从镍到铁的电荷转移，并且碳的添加尤其增强了电荷转移。由于从镍到铁的电荷转移增强而加速质子放电似乎是 Ni-Fe-C 合金析氢活性高的原因。 (C) 2000 年电化学协会。 S0013-4651(00)01-083-1。版权所有。
Tailoring of active nickel alloy cathodes fur hydrogen evolution in a hot concentrated hydroxide solution was attempted by electrodeposition. Electrodeposited iron is naturally more active for hydrogen evolution than nickel, but Ni-Fe alloys show further high activity for hydrogen evolution, although the rate-determining step being assumed as proton discharge is not changed. The carbon addition to iron or nickel remarkably enhances the activity for hydrogen evolution and changes the mechanism of hydrogen evolution. Ternary Ni-Fe-C alloys show the highest activity for hydrogen evolution, and the Tafel slope of hydrogen evolution is about 33 mV/dec, suggesting the rate-determining step of desorption of adsorbed hydrogen by recombination. XPS analysis reveals that the charge transfer occurs From nickel to iron in alloys and the carbon addition particularly enhances the charge transfer. Accelerated proton discharge due to enhanced charge transfer from nickel to iron seems responsible for the high activity of the Ni-Fe-C alloys for hydrogen evolution. (C) 2000 The Electrochemical Society. S0013-4651(00)01-083-1. All rights reserved.