Polyaniline-supported Al-doped MnO2@carbon cloth-based electrode material for quasi-solid-state flexible supercapacitor

• Published in: Journal of materials science. Materials in electronics 2021-07, Vol.32 (14), p.19820-19831
• Main Authors: Zeng, Jiamin, Wang, Ruilan, Xu, Mengyao, Wang, Xiaodong, Zhou, An’an, Yang, Zhenglong
• Format: Article
• Language: English
• Subjects: Capacitance; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cloth; Electrode materials; Electrodes; Flux density; Hydrothermal reactions; Low voltage; Manganese dioxide; Materials Science; Optical and Electronic Materials; Polyanilines; Supercapacitors
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-06505-1

As one of the most promising electrode materials for supercapacitors, MnO 2 has the problems of low voltage window and poor conductivity. It has been shown that Al-doped MnO 2 can effectively improve the voltage window and specific capacitance, and polyaniline loading can further bring higher specific capacitance. Polyaniline-supported Al-doped MnO 2 carbon cloth-based flexible electrode material (PANI@Al-MnO 2 @CC) was prepared by hydrothermal reaction and in-situ polymerization. Compared with MnO 2 electrode material, the working voltage window of PANI@Al-MnO 2 @CC is increases to 1.25 V, the area specific capacitance can be as high as 1016 mF cm −2 , and still maintain 80.1% of the original value at 20 mA cm −2 after 5000 cycles. Furthermore, the voltage window of the flexible symmetrical supercapacitor made of the material can reach 0–2.4 V, and has a super large area specific capacitance of 149.75 mF cm −2 and a high energy density of 1.60 mWh cm −3 at 6 mA cm −2 .