由碳还原KMnO4制备氧化锰/碳超级电容材料

以碳粉为还原剂，在酸性条件下与KMnO₄反应制备了粉末状氧化锰/碳复合材料，研究了碳还原剂种类（活性炭、石墨化中间相碳微球和膨胀石墨）以及镍、钴、铒离子对制备的氧化锰/碳粉末结构及电化学性能的影响。采用X-衍射技术和扫描电子显微镜（SEM）分析了氧化锰/碳的结晶结构及表面形态。结果表明，活性炭具有较强的还原能力，氧化锰/碳材料具有良好的电化学电容行为，其中以活性炭为还原剂制备的氧化锰/碳具有较高的电容量，质量比容量达117F/g，掺杂镍、钴后质量比容量达到185F/g。

Synthesis of manganese oxide/carbon composites by reduction of KMnO4 with carbon

Manganese oxide/carbon powders have been prepared by reduction of acidic KMnO4 by carbon. The influence of the type of carbon [active carbon (AC), meso-carbon microbeads (MCMB), and flexible graphite (FG)] as well as the presence of Ni2 , Co2 or Er2 /Er3 ions on the structure and electrochemical properties of the resulting manganese oxide/carbon powders was investigated. The structure and surface morphology of the manganese oxide/carbon powders were examined by X-ray diffraction and scanning electron microscopy. It was shown that AC has a higher reducing power than either FG or MCMB. Results of CV experiments showed that the manganese oxide/carbon powders possess excellent capacitive properties, with the specific capacitance measured by cyclic voltammograms reaching a maximum of 117 F/g before doping. After doping with Ni2 and Co2 ions, the specific capacitance showed an increased value of 185 F/g.