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Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

机译：Ni（OH）2和NiO基复合材料：用于混合超级电容器设备的电池型电极材料

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Nanocomposites of Ni(OH)2 or NiO have successfully been used in electrodes in the last five years, but they have been falsely presented as pseudocapacitive electrodes for electrochemical capacitors and hybrid devices. Indeed, these nickel oxide or hydroxide electrodes are pure battery-type electrodes which store charges through faradaic processes as can be shown by cyclic voltammograms or constant current galvanostatic charge/discharge plots. Despite this misunderstanding, such electrodes can be of interest as positive electrodes in hybrid supercapacitors operating under KOH electrolyte, together with an activated carbon-negative electrode. This study indicates the requirements for the implementation of Ni(OH)2-based electrodes in hybrid designs and the improvements that are necessary in order to increase the energy and power densities of such devices. Mass loading is the key parameter which must be above 10 mg·cm−2 to correctly evaluate the performance of Ni(OH)2 or NiO-based nanocomposite electrodes and provide gravimetric capacity values. With such loadings, rate capability, capacity, cycling ability, energy and power densities can be accurately evaluated. Among the 80 papers analyzed in this study, there are indications that such nanocomposite electrode can successfully improve the performance of standard Ni(OH)2 (+)//6 M KOH//activated carbon (−) hybrid supercapacitor.
机译：在过去的五年中，Ni（OH）2或NiO的纳米复合材料已成功用于电极中，但错误地将其用作电化学电容器和混合设备的伪电容电极。实际上，这些氧化镍或氢氧化镍电极是纯电池型电极，可通过法拉第过程存储电荷，如循环伏安图或恒流恒电流充电/放电图所示。尽管存在这种误解，但这种电极可能与作为活性炭负电极一起在KOH电解质下工作的混合超级电容器中的正电极感兴趣。这项研究表明在混合设计中实施基于Ni（OH）2的电极的要求以及为增加此类设备的能量和功率密度而必须进行的改进。质量负载是关键参数，必须大于10 mg·cm −2 才能正确评估Ni（OH）2或NiO基纳米复合电极的性能并提供重量容量值。利用这样的负载，可以准确地评估速率能力，容量，循环能力，能量和功率密度。在这项研究中分析的80篇论文中，有迹象表明，这种纳米复合电极可以成功地改善标准Ni（OH）2（+）// 6 M KOH //活性炭（-）混合超级电容器的性能。

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