Typical functionalization treatment by strong acid is used to introduce functional groups into/onto the multiwall carbon nanotubes (MWCNTs), to enhance the desired redox activity for electrochemical applications. The influence of various functional groups on the redox of MWCNT has been studied in recent years. Different functional groups on MWCNT can be removed selectively using different thermal annealing temperatures. By this method, it is recognized that carboxyl, anhydride, and phenol groups play essential roles in the redox reaction. A designed carboxyl/anhydride-rich defective MWCNT is fabricated with a superior specific areal capacitance of 34.55 mF/cm². These results provide more information for the study of the MWCNTs' electrochemical applications toward supercapacitors and batteries.

通过强酸进行的典型官能化处理用于将官能团引入多壁碳纳米管（MWCNT）中/之上，以增强电化学应用所需的氧化还原活性。近年来已经研究了各种官能团对MWCNT的氧化还原的影响。可以使用不同的热退火温度选择性去除MWCNT上的不同官能团。通过这种方法，认识到羧基，酸酐和酚基在氧化还原反应中起着重要的作用。所设计的富含羧基/酸酐的缺陷MWCNT的比表面积电容为34.55 mF / cm ²。这些结果为研究多壁碳纳米管在超级电容器和电池中的电化学应用提供了更多信息。