The influence of pretreatment on multi-wall carbon nanotubes for electrochemical capacitors
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摘要: 对化学气相沉积法制备的多壁碳纳米管（MWCNTs）依次进行球磨、化学活化和氨化预处理，探讨预处理方法对MWCNTs双电层电容的影响。结果表明，球磨、化学活化可剪短MWCNTs，提高比表面积和孔容，氨化则降低已活化MWCNTs的比表面积；电化学性能测试显示经过球磨、化学活化和氨化处理，MWCNTs的导电性依次提高，球磨和化学活化由循环伏安测得的比容量相当，高于氨化；放电电流密度由5mA/g增至100mA/g，球磨、化学活化和氨化预处理后MWCNTs的放电容量分别衰减了17%、27%、13%。Abstract: Multi-wall carbon nanotubes (MWCNTs) prepared by chemical vapor deposition, were pretreated by ball milling, chemical activation and ammoxidation and the influence of the pretreatment on their electrochemical capacitance was investigated. Results show that MWCNTs can be shortened and broken by ball milling and chemical activation, and as a result their surface area and pore volume are increased. However, ammoxidation decreases the surface area of the activated MWCNTs. The electrical conductivity of the ball-milled MWCNTs is the smallest while that of the ammoxidated is the largest. The specific capacitances of the ball-milled and the activated MWCNTs are close, but higher than that of the ammoxidated MWCNTs. The capacitances of the MWCNTs pretreated by ball milling, chemical activation and ammoxidation are reduced by 17, 27 and 13% respectively when the discharge current density is increased from 5 to 100mA/g.
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