关键词: 水系非对称超级电容器, 二氧化锰, 活性炭电极

Abstract:

In this work, the manganese dioxide (MnO₂) materials were prepared by solution approach at low temperature, thermal decomposition and electrochemical deposition. The actived carbon (AC) and MnO₂ composite electrodes were used for aqueous supercapacitors. The morphologies and structures of the prepared materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the electrochemical behaviors were tested by cyclic voltammetry (CV) and galanostatic charge-discharge tests. Electrochemical test data show that the maximum specific capacitances of 151, 172 and 141 F•g^-1 were obtained with the contents of MnO₂ being 70, 60 and 70% in the composites, respectively. However, the influence of MnO₂powder on the electrode impedance was not straightforward.

Key words: aqueous asymmetic super capacitor, manganese oxide, activated carbon electrode