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首页> 外文期刊>International Journal of Electrochemistry >The Capacitive Behaviors of Manganese Dioxide Thin-Film Electrochemical Capacitor Prototypes
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The Capacitive Behaviors of Manganese Dioxide Thin-Film Electrochemical Capacitor Prototypes

机译：二氧化锰薄膜电化学电容器原型的电容行为

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摘要

We have documented the fabrication of manganese dioxide (MnO2) thin-film electrochemical capacitor (EC) prototypes with dual-planar electrode configuration. These EC prototypes exhibited good capacitive behaviors in mild Na2SO4aqueous electrolyte. Enhanced capacitive behaviors of EC prototypes were observed upon prolonged voltammetric cycling which could be associated with microstructural transformation of MnO2thin-film electrodes from densely packed plate-like to irregular petal-like surface morphology. Effects of voltammetric scan rates, prolonged voltammetric cycling, electrolyte composition, and electrolyte concentration on the surface morphology of MnO2thin-film electrodes, and associated capacitive behaviors of MnO2thin-film EC prototypes were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) techniques. Results of both CV and EIS indicated that thin-film MnO2EC prototypes exhibited the highest specific capacitance of 327 F/g in 0.2 M Na2SO4aqueous electrolyte. Being environmentally benign and cheap, MnO2thin-film electrochemical capacitors have high potential utility as pulsed power sources, as well as load-leveling functions in various consumer electronic devices.
机译：我们已经记录了具有双平面电极配置的二氧化锰（MnO2）薄膜电化学电容器（EC）原型的制造。这些EC原型在温和的Na2SO4水溶液中表现出良好的电容性能。长时间的伏安循环观察到EC原型的增强的电容行为，这可能与MnO2薄膜电极的微观结构从密堆积的板状到不规则的花瓣状表面形态有关。通过循环伏安法（CV），电化学阻抗谱（EIS）研究了伏安扫描速率，延长的伏安循环，电解液成分和电解液浓度对MnO2薄膜电极表面形态的影响以及MnO2薄膜EC原型的相关电容行为。 ）以及恒电流充电/放电（GCD）技术。 CV和EIS的结果都表明，薄膜MnO2EC原型在0.2µM Na2SO4水溶液中显示出最高的比电容327 specificF / g。 MnO2薄膜电化学电容器具有良好的环境效益和价格便宜，作为脉冲电源具有很高的潜力，并在各种消费电子设备中具有负载均衡功能。

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