A self-supported, flexible, binder-free pseudo-supercapacitor electrode material with high capacitance and cycling stability from hollow, capsular polypyrrole fibers

作者：Li, Zhenyu; Cai, Jie; Cizek, Pavel; Niu, Haitao; Dua, Yong; Lin, Tong^*

来源：Journal of Materials Chemistry A, 2015, 3(31): 16162-16167.

DOI：10.1039/c5ta03585f

• HIGH-PERFORMANCE SUPERCAPACITOR
• SYMMETRIC REDOX SUPERCAPACITOR
• ENERGY-STORAGE
• CONDUCTING POLYANILINE
• CARBON NANOTUBE
• GRAPHENE OXIDE
• THIN-FILM
• ELECTROCHEMICAL SUPERCAPACITOR
• ASYMMETRIC SUPERCAPACITOR
• FORMATION MECHANISM

Flexible energy devices with high performance and long-term stability are highly promising for applications in portable electronics, but remain challenging to develop. As an electrode material for pseudo-supercapacitors, conducting polymers typically show higher energy storage ability over carbon materials and larger conductivity than transition-metal oxides. However, conducting polymer-based supercapacitors often have poor cycling stability, attributable to the structural rupture caused by the large volume contrast between doping and de-doping states, which has been the main obstacle to their practical applications. Herein, we report a simple method to prepare a flexible, binder-free, self-supported polypyrrole (PPy) supercapacitor electrode with high cycling stability through using novel, hollow PPy nanofibers with porous capsular walls as a film-forming material. The unique fiber structure and capsular walls provide the PPy film with enough free-space to adapt to volume variation during doping/de-doping, leading to super-high cycling stability (capacitance retention > 90% after 11 000 charge-discharge cycles at a high current density of 10 A g(-1)) and high rate capability (capacitance retention similar to 82.1% at a current density in the range of 0.25-10 A g(-1)).

• 出版日期2015
• 单位迪肯大学; 华中农业大学; 吉林大学