摘要
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,质量比容量达到117F/g,掺杂镍、钴后质量比容量达到185F/g。
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 Ni^2＋, Co^2＋ or Er^2＋/Er^3＋ 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 Ni^2＋ and Co^2＋ ions, the specific capacitance showed an increased value of 185 F/g.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第2期150-153,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家"863"计划(2001AA501234)
关键词
超级电容器
氧化锰/碳
循环伏安
supercapacitor
manganese oxide/carbon cyclic voltammetry
