添加多壁纳米碳管活性炭电极材料的电化学电容特性

The electrochemical capacitance characteristics of activated carbon electrode material with a multi-walled carbon nanotube additive

在活性炭电极材料中,用多壁纳米碳管作导电添加剂替代传统的炭黑、石墨粉等可较大地改善电极材料的性能。当添加质量分数为5%的多壁纳米碳管时,活性炭电化学电容器的比电容量由添加同量炭黑的130 F/g增加到185 F/g,同时提高了活性炭电容器的频率响应性能。基于该研究结果试制出不同规格的添加多壁纳米碳管的活性炭电化学电容器样品,结果表明添加多壁纳米碳管的活性炭电极材料具有良好的电化学电容特性。

Multi-walled carbon nanotubes （MWNTs） were used as a conducting additive in activated carbon electrode materials instead of the commonly used carbon black and graphite powder conducting additive. It was found that MWNTs can greatly improve the capacitor performance. When 5 w/% MWNT conducting additive was used, the specific capacitance of activated carbon can be increased to 185 F/g compared with 130 F/g of activated carbon with 5 w/% carbon black conducting additive, and the frequency response characteristic of the MWNT-added activated carbon electrochemical capacitor is much better than that of one with added carbon black. Moreover, some prototype electrochemical capacitors were fabricated on the basis of the research results. All these show that activated carbon with added MWNTs has a good capacitance performance and is suitable for application in electrochemical capacitors.