Abstract The energy density of a rechargeable device may be determined by the specific capacity of electrodes and the potential difference between the anode and cathode. Therefore, high specific capacitances are required for energy storage devices with high energy densities. Electrodes with high surface areas generally provide good contact between the electrode and electrolyte, hence, the electrode material is important for supercapacitor applications. The structure and surface area of the electrodes may be affected by fabrication parameters and processes used. As the structure of the electrode is related to the performance of energy storage devices, electrodeposition parameters of electrodes were studied. In this research, the effect of electrodeposition potential on cobalt structure and capacitive performance of resulting electrodes were reported. Co-based film was cathodically electrodeposited by applying different potentials (−1.3 V to −1.7 V) on the graphite electrode. Morphological and structural characteristics of coatings were examined by SEM and FTIR. The electrodes were then immersed in an alkaline (KOH) bath for capacitance measurements. The rate limiting reactions of the electrodes in KOH depending on deposition potential was studied. The galvanostatic charge-discharge curves for the negative graphite electrode and positive cobalt-based electrode were obtained. Electrochemical performances of the nano-composite electrodes varied with the applied voltages. The electrode showed a maximum specific capacity of 1692 F g−1 at 5 mV s−1. Capacitance retention of Co-based films after 1000 cycles in KOH varied from 26% to 108% depending on the deposition potentials.

中文翻译：

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阴极沉积电位对用于非对称超级电容器制造的纳米结构钴基薄膜性能的影响

摘要 可充电设备的能量密度可由电极的比容量和正负极之间的电位差决定。因此，具有高能量密度的储能装置需要高比电容。具有高表面积的电极通常在电极和电解质之间提供良好的接触，因此，电极材料对于超级电容器应用很重要。电极的结构和表面积可能受制造参数和所用工艺的影响。由于电极的结构关系到储能器件的性能，因此对电极的电沉积参数进行了研究。在这项研究中，报告了电沉积电位对所得电极的钴结构和电容性能的影响。通过在石墨电极上施加不同的电位（-1.3 V 至 -1.7 V），对 Co 基薄膜进行阴极电沉积。通过SEM和FTIR检查涂层的形态和结构特征。然后将电极浸入碱性 (KOH) 浴中以进行电容测量。研究了电极在 KOH 中的限速反应取决于沉积电位。获得了石墨负极和钴基正极的恒电流充放电曲线。纳米复合电极的电化学性能随施加的电压而变化。该电极在 5 mV s-1 时显示出最大比容量为 1692 F g-1。