Enhanced oxygen evolution at hydrous nickel oxide electrodes via electrochemical ageing in alkaline solution
Enhanced oxygen evolution at hydrous nickel oxide electrodes via electrochemical ageing in alkaline solution
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DOI：
10.1016/j.elecom.2013.03.040
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发表时间：
2013-07-01
影响因子：
5.4
通讯作者：
Lyons, M. E. G.
中科院分区：
文献类型：
--
作者：
Godwin, I. J.;Lyons, M. E. G.
电化学老化含水氧化镍薄膜通过缓慢的重复电位多循环在整个主要镍（II/III）氧化还原峰的影响进行了研究，在水基环境中使用循环伏安法和稳态极化曲线中的析氧反应（OER）区域。含水氧化镍薄膜和电沉淀的“电池型”氧化镍之间的相似性，由于其相似的变化，氧化还原和氧气的演变性能作为一个结果，薄膜老化。发现该老化方法显著增强含水氧化镍电极的OER性能，其中OER过电位降低60 +/-2mV，并且对于固定的过电位，OER速率比未老化电极的OER速率增加10倍。发现老化电极的OER转换频率为1.16 +/- 0.07 s（-1），而未经历老化的含水氧化镍电极的OER转换频率为0.05 +/- 0.003 s（-1）。(C)2013爱思唯尔有限公司版权所有。
The effect of electrochemically ageing hydrous nickel oxide films via slow repetitive potential multi-cycling across the main nickel (II/III) redox peak was investigated in an aqueous base environment using cyclic voltammetry and steady state polarisation curves in the oxygen evolution reaction (OER) region. Similarities between hydrous nickel oxide films and electroprecipitated 'battery type' nickel oxide were shown due to their similar change in redox and oxygen evolving properties as a result of film ageing. This ageing method was found to significantly enhance the OER performance of the hydrous nickel oxide electrode with the OER overpotential decreasing by 60 +/- 2 mV and experiencing a 10 fold increase in OER rate for a fixed overpotential over that of an un-aged electrode. The OER turnover frequency for an aged electrode was found to be 1.16 +/- 0.07 s(-1) in comparison to 0.05 +/- 0.003 s(-1) for a hydrous nickel oxide electrode not subjected to ageing. (C) 2013 Elsevier B.V. All rights reserved.