1. Preparation of flexible and free-standing polypyrrole/graphene film electrodes for supercapacitors.
- Author
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Li, Zhimin, Yao, Mingxiang, Zhang, Lantian, Gou, Shuqi, Zhang, Ziyu, Yang, Yuying, and Hu, Zhongai
- Subjects
SUPERCAPACITOR electrodes ,GRAPHENE ,SUPERCAPACITORS ,ENERGY density ,GRAPHENE oxide ,ELECTRODES ,POLYPYRROLE - Abstract
A flexible self-supporting and binder-free supercapacitor electrode is fabricated by embedding a polypyrrole (PPy) nanostructured network into only one side of a graphene thin film via a spin coating method and a subsequent hydrothermal process. Based on the amphiphilic nature of the graphene oxide (GO) thin film, the well-defined PPy nanoparticles are well dispersed and form a reticular structure on the thin film surface. After reduction treatment at a temperature of 180 °C, the reduced graphene oxide (rGO) thin film not only provides a large accessible surface area for the dispersion of PPy nanoparticles but also acts as a binder-free conductive current collector. The polypyrrole/graphene film (PGF) electrode material exhibits an excellent electrochemical performance in the three-electrode configuration, including a high specific capacitance of up to 455 F g
−1 at 1 A g−1 and outstanding cycling stability (97% capacitance retention after 1000 cycles). In addition, the symmetric PGF supercapacitor shows a specific capacitance of up to 49.3 F g−1 at a cell voltage of 1.4 V and exhibits a maximum energy density of 13.4 W h kg−1 at a power density of 700 W kg−1 , with 96% capacitance retention after 1000 cycles. This work shows impressive potential in fabricating high-performance flexible electrodes for supercapacitors. [ABSTRACT FROM AUTHOR]- Published
- 2022
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