Preparation of ternary composite CF@γ-MnO2/PANI material in electrochemical supercapacitors

• Published in: Journal of materials science. Materials in electronics 2021-10, Vol.32 (20), p.25300-25317
• Main Authors: Zhu, Yuanqiang, Xu, Hui, Tang, Jing, Jiang, Xudong, Bao, Yuanhai, Chen, Yong
• Format: Article
• Language: English
• Subjects: Capacitance; Carbon fibers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Discharge measurement; Electrochemical analysis; Electrochemical impedance spectroscopy; Flux density; Manganese dioxide; Materials Science; Nanoparticles; Optical and Electronic Materials; Polyanilines; Supercapacitors
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-06989-x

In this paper, a ternary hybrid material carbon fiber/manganese dioxide/polyaniline (CF@γ-MnO 2 /PANI) is synthesized for its utility in supercapacitor application. γ-MnO 2 nanoparticles are loaded on the surface of CF under hydrothermal conditions to prepare CF@γ-MnO 2 . Subsequently, PANI in situ polymerized on the surface of CF@γ-MnO 2 to form CF@γ-MnO 2 /PANI ternary composite. The electrochemical performance of CF@γ-MnO 2 /PANI is investigated using cyclic voltammetry (CV), galvanostatic charge–discharge measurement (GCD), and electrochemical impedance spectroscopy (EIS). Compared with CF/PANI and PANI, the as-prepared ternary hybrid material exhibits the highest capacitance of 654.3 F g −1 at a current density of 1 A g −1 , its rate performance is 78.1% (10 A g −1 ), and 75.94% of the initial capacitance after 4000 charge–discharge cycles. The asymmetric supercapacitor shows a specific capacitance of 260 F g −1 and high energy density 30.9 Wh kg −1 at a power density of 750 W kg −1 , good cycling stability by maintaining 73.2% initial capacitance after 5000 cycles. The good capacitive behaviors demonstrated that the low-cost CF provides an excellent base for γ-MnO 2 and PANI. The nanoparticles γ-MnO 2 is supported on the surface of CF and coated by PANI, which effectively improves the utilization rate of MnO 2 and PANI. It could be a promising material for supercapacitors applications.