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首页> 外文会议>Meeting of the Electrochemical Society;Symposium on physical and analytical electrochemistry general session >Redox Switching and Oxygen Evolution at Hydrous Nickel Oxide Films in Aqueous Alkaline Solution
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Redox Switching and Oxygen Evolution at Hydrous Nickel Oxide Films in Aqueous Alkaline Solution

机译：碱性水溶液中水合氧化镍膜的氧化还原转换和析氧

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摘要

The redox switching reaction and the oxygen evolution reaction at multi-cycled nickel oxy-hydroxide films in aqueous alkaline solution are discussed. The hydrous oxide is considered as a porous assembly of interlinked octahedrally coordinated anionic metal oxyhydroxide surfaquo complexes which form an open network structure. The latter contains considerable quantities of water molecules which facilitate hydroxide ion discharge at the metal site during active oxygen evolution. The dynamics of redox switching has been quantified in terms of a diffusive frequency using the Laviron-Aoki diffusion model. Steady state Tafel plot analysis has been used to elucidate the kinetics and mechanism of oxygen evolution with slopes of ca. 60 mVdec~(-1) and ca. 120 mVdec~(-1) at low and high overpotentials respectively, whereas the reaction order with respect to hydroxide ion activity remains invariant at ca. 1.0 as the potential is increased. These observations are rationalized in terms of a kinetic scheme involving surfaquo groups.
机译：讨论了氧化还原切换反应和多环镍氧氧膜在碱性水溶液中的氧气进化反应。含水氧化物被认为是形成开放网络结构的相互链接的八面体配位的阴离子金属羟基氧化物Surfaquo复合物的多孔组装。后者含有大量的水分子，其在活性氧进化期间促进金属位点处的氢氧化离子排出。使用Laviron-Aoki扩散模型的漫射频率而言，氧化还原切换的动态已经过量。稳态Tafel Plot分析已被用于阐明与CA斜坡的氧气进化的动力学和机制。 60 MVDEC〜（-1）和CA。在低和高过电位的120mVdec〜（-1），而相对于氢氧代离子活性的反应顺序仍然是CA的不变。 1.0由于潜力增加。这些观察结果在涉及Surfaquo群体的动力学方案方面是合理化的。

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