添加硅氧化物对活性碳结构及电容性能的影响  

Influences of adding silica on structure and capacitive performance of activated carbon

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作  者:刘皓[1] 薛锐生[1] 于建民[1] 沈曾民[1] 

机构地区:[1]北京化工大学材料学院,北京100029

出  处:《电源技术》2009年第3期204-206,212,共4页Chinese Journal of Power Sources

摘  要:从煤沥青出发,制备出中间相沥青与含有硅氧化物的中间相沥青。以这两种中间相沥青为原料,KOH为活化剂制备活性碳,通过比较两种活性碳结构与电容性能,来研究添加硅氧化物对中间相沥青基活性碳结构及电容性能的影响。研究结果表明:含有硅氧化物的中间相沥青在活化时更容易生成高表面积活性碳,在相同碱/碳比例下,硅氧化物的存在导致生成的活性碳比表面积与孔容增加,平均孔径降低,比容量增加。在碱/碳比为5时,添加硅氧化物后,使活性碳的比表面积由3015m2/g增加到3132m2/g,比容量由221.04F/g增加到269.28F/g。The mesophase pitch and mesophase pitch containing silica were produced from coal pitch. The activated carbons were prepared by these two kinds of mesophase pitch with KOH as activator. The effects of adding silica on the structure and capacitive performance of the mesophase pitch based activated carbon were studied by comparing the structure and capacitive performance of these two kinds of activated carbons. The results show that adding silica to mesophase pitch is helpful to obtain the high specific surface area activated carbon. At the same alkali/carbon ratio, adding silica to mesophase pitch can increase the specific surface area, the pore volume and the specific capacitance of activated carbon and decrease the average pore size. At the alkali/carbon ratio of 5, the specific surface area increases from 3 015 m2/g to 3 132 m2/g and the specific capacitance increases from 221.04 F/g to 269.28 F/g by adding silica.

关 键 词:活性碳 中间相沥青 超级电容器 电化学性能 

分 类 号:TM53[电气工程—电器]

 

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