用于超级电容器的MnO₂/PANI@CNT复合材料的制备及其电化学性能

Preparation and the Electrochemical Performance of MnO2/PANI@CNT Composite for Supercapacitors.

作者信息

Wang Hongjuan, Wang Xiaohui, Peng Cheng, Peng Feng, Yu Hao

出版信息

J Nanosci Nanotechnol. 2015 Jan;15(1):709-14. doi: 10.1166/jnn.2015.9166.

DOI:10.1166/jnn.2015.9166

Abstract

Polyaniline (PANI) was settled on the surface of CNTs in advance and then used as self-sacrifice reducing agent that would react with KMnO4 to prepare MnO2/PANI@CNT supercapacitor material. With PANI substituting for CNTs to participant the redox reaction, CNTs was protected from being destroyed and could maintain its original morphology and conductivity. The results of cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) show that the optimal capacitive performance can be reached at the MnO2 loading of 64.4 wt% and the pH of 1 during the deposition of MnO2. With the protective PANI, MnO2/PANI@CNT composite exhibits the superior specific capacitance of 215.8 F/g at a current density of 200 mA/g and remains 86.5% of its maximal specific capacitance at a current density of 1000 mA/g.

摘要

聚苯胺（PANI）预先沉积在碳纳米管（CNT）表面，然后用作自牺牲还原剂，与高锰酸钾反应制备MnO₂/PANI@CNT超级电容器材料。通过聚苯胺替代碳纳米管参与氧化还原反应，碳纳米管受到保护不被破坏，并能保持其原始形态和导电性。循环伏安法（CV）和恒电流充放电（GCD）结果表明，在MnO₂沉积过程中，MnO₂负载量为64.4 wt%且pH值为1时可达到最佳电容性能。在具有保护作用的聚苯胺存在下，MnO₂/PANI@CNT复合材料在电流密度为200 mA/g时表现出215.8 F/g的优异比电容，在电流密度为1000 mA/g时仍保持其最大比电容的86.5%。