泡沫镍基α-MnO2/Ni电极的原位合成与电化学性能研究

α-MnO2 was in-situ deposited on the current collector of nickel foam by using the raw materials of MnSO4﹒H2O and KMnO4 through hydrothermal treatment. The crystal structure, surface morphology and electrochemical performance of the electrode materials of α-MnO2/Ni were investigated, respectively. Experimental results of XRD and SEM showed that α-MnO2 can be deposited on electrode materials with bulk morphology and imperfect crystal structure in reaction time of 8 h. As prolonging the reaction time from 10 h to 14 h, the growth of α-MnO2 was improved and a plush-sphere-like morphology (500 nm ~1μm) for 10 h changed to a sea-urchin-like morphology (~7μm) for 14 h. Meanwhile, the tests of cyclic voltammetry and galvanostatic charge-discharge indicated that the electrochemical performance of electrode material obtained with reaction time of 8 h was not good (132.2 F/g). The specific capacitance of α-MnO2 prepared in 10 h, however, rapidly increased to 256.5 F/g and then decreased as prolonging the reaction time further. The fact, electrochemical performance of α-MnO2 related to the grain size, indicated the specific surface area of active electrode material is one of important factors for improving the specific capacitance of electrode materials.