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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >The role of ions and reaction sites for electrochemical reversible charge cycling in mesoporous nickel hydroxides
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The role of ions and reaction sites for electrochemical reversible charge cycling in mesoporous nickel hydroxides

机译：离子和反应部位对介孔氢氧化镍中电化学可逆电荷循环的作用

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摘要

Layered nickel hydroxide thin films with mesoporous structure were prepared on ITO substrates by a facile chemical bath deposition method. The electrochemical properties of the nickel hydroxide/oxyhydroxide films were investigated in both potassium hydroxide and lithium perchlorate in propylene carbonate electrolytes. We show that the high reversible charge cycling capability of the material is enabled by the redox reaction involving hydroxyl ions, especially in the oxidative cycle. Li ion reversible charge cycling requires available reaction or adsorption sites that can be provided by sub-stoichiometry or defective films. Raising the defect concentration, the cyclic reversibility is shown to increase by ~5 times. The effects of intercalated water in the interlayers are also discussed. We show that the presence of water in the interlayers can lead to a passivating reaction during the charge cycling and also cause optical efficiency losses through unwanted charge trapping.
机译：采用简便的化学浴沉积方法在ITO衬底上制备了具有介孔结构的层状氢氧化镍薄膜。研究了碳酸亚丙酯电解液中氢氧化钾和高氯酸锂中氢氧化镍/羟基氧化镍膜的电化学性能。我们表明，材料的高可逆电荷循环能力是由涉及羟基离子的氧化还原反应实现的，尤其是在氧化循环中。锂离子可逆电荷循环需要可用亚化学计量或有缺陷的膜提供的反应或吸附位点。提高缺陷浓度，循环可逆性显示增加了约5倍。还讨论了夹层中夹层水的影响。我们表明，中间层中水的存在会导致电荷循环期间发生钝化反应，并且还会由于不必要的电荷捕获而导致光学效率损失。

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