Core-shell structured carbon nanofibers yarn@polypyrrole@graphene for high performance all-solid-state fiber supercapacitors
2018
Chen, Long | Li, Deping | Chen, Lina | Si, Pengchao | Feng, Jinkui | Zhang, Lin | Li, Yanhui | Lou, Jun | Ci, Lijie
Carbon nanofibers yarns (CNY) have been prepared by carbonizing twisted electrospun PAN nanofibers, which can be used as the electrode of fiber-shaped all-solid-state supercapacitor after depositing conductive polymer of polypyrrole (PPy) and reduced graphene oxide (rGO) on their surface to form a core-shell structure (CNY@PPy@rGO). The flexible and binder-free fiber supercapacitors with PVA/H₃PO₄ gel electrolyte have a high specific capacitance (92.57 F/g, 80.46 F/cm³, 836.87 mF/cm², and 111.46 mF/cm of CM, CV, CA, and CL, respectively, at the scan rate of 2 mV/s) thanks to the core-shell structure and synergistic effects of three conponents. It also shows high cycling performance with 86% capacitance retention after 10000 cycles with excellent flexibility and stability at different bending angles.
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