Preparation of Activated Carbon/MnO2 Composite Electrode Materials and Its Electrochemical Performance
LI Xiang1, ZHENG Feng2, LUO Yuan1, LUO Yongmei1
1 School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550003; 2 School of Materials Science and Engineering, Central South University, Changsha 410083
Abstract: KMnO4 reacted with MnCl2 while doped different activated carbon in reaction kettle at 140 ℃ for 6 h, then compo-site electrode materials for supercapacitor were prepared after ball mill. Specific surface area of 451 m2/g was obtained through BET mehtod for content of 29wt% activated carbon. XRD result revealed that MnO2/activated carbon composite were hydrated and amorphous. Morphology of composite was tiny and surrounded micro-nanometer pompon globe by SEM. XPS spectrum showed composite existence of Mn4+ in oxide form. Specific capacitance of the electrode reached 365 F/g when scan rate was 50 mV/s, and charge-discharge efficiency was 93% as well as equivalent series resistance value of 0.87 Ω. Composite electrode appeared crystal phase with different degree after 3 000 cycles, meanwhile, morphology of the electrode turned into particles and block, and capacitance value of the electrode decayed to only approximate 6%.
李祥,郑峰,罗援,罗泳梅. 超级电容器活性炭／MnO2复合电极材料的制备及性能[J]. 《材料导报》期刊社, 2018, 32(12): 1949-1954.
LI Xiang, ZHENG Feng, LUO Yuan, LUO Yongmei. Preparation of Activated Carbon/MnO2 Composite Electrode Materials and Its Electrochemical Performance. Materials Reports, 2018, 32(12): 1949-1954.
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2018, Vol. 32 
