Abstract A facile hydrothermal route synthesizes Co3O4 nanocrystals with urchin spine-like morphology. Structure and microstructural characterizations of the sample are carried out. Electrochemical properties have been explored in the presence of different electrolytes. In order to find out the best electrolyte, three electrolytes (Na2SO4, NaOH and Na2SO4 with Hq) of fixed concentration (1 M) are used to record the cyclic voltammetry data. In the presence of Na2SO4 as an electrolyte, specific capacitance becomes 218 F g−1, possibly because of low ionic conductivity of SO42−, higher charge transfer resistance. When NaOH and Na2SO4 (with Hq) are used as electrolytes, high specific capacitances of 1720 F g−1 and 2433 F g−1 respectively are obtained due to extra pseudocapacitive effect of redox reaction. It is worth noting that the semicircle diameter in the EIS plot is highest for Na2SO4 and lowest for Na2SO4 (with Hq) electrolyte. The Rct value depends on the type of electrode and the interaction between electrolyte ions with the electrode.

中文翻译：

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用于储能应用的具有形态层次的 Co3O4 增强的电化学性能：与不同电解质的比较研究

摘要 一种简便的水热途径合成了具有海胆棘状形态的 Co3O4 纳米晶体。进行样品的结构和微观结构表征。已经在不同电解质的存在下探索了电化学性质。为了找出最佳电解质，使用固定浓度（1 M）的三种电解质（Na2SO4、NaOH 和 Na2SO4 with Hq）记录循环伏安数据。在存在 Na2SO4 作为电解质的情况下，比电容变为 218 F g-1，可能是因为 SO42- 的离子电导率低，电荷转移电阻更高。当 NaOH 和 Na2SO4（含 Hq）用作电解质时，由于氧化还原反应的额外赝电容效应，分别获得了 1720 F g-1 和 2433 F g-1 的高比电容。值得注意的是，EIS 图中的半圆直径对于 Na2SO4 最高，对于 Na2SO4（含 Hq）电解质最低。Rct 值取决于电极的类型以及电解质离子与电极之间的相互作用。