title: Extremely Stable Polypyrrole Achieved via Molecular Ordering for Highly Flexible Supercapacitors.
abstract: The cycling stability of flexible supercapacitors with conducting polymers as electrodes is limited by the structural breakdown arising from repetitive counterion flow during charging/discharging. Supercapacitors made of facilely electropolymerized polypyrrole (e-PPy) have ultrahigh capacitance retentions of more than 97, 91, and 86% after 15000, 50000, and 100000 charging/discharging cycles, respectively, and can sustain more than 230000 charging/discharging cycles with still approximately half of the initial capacitance retained. To the best of our knowledge, such excellent long-term cycling stability was never reported. The fully controllable electropolymerization shows superiority in molecular ordering, favoring uniform stress distribution and charge transfer. Being left at ambient conditions for even 8 months, e-PPy supercapacitors completely retain the good electrochemical performance. The extremely stable supercapacitors with excellent flexibility and scalability hold considerable promise for the commerical application of flexible and wearable electronics.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Hong Kong, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Hong Kong, China.
authors.forename: Minshen
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Hong Kong, China.
authors.forename: Zengxia
authors.initials: Z
authors.lastname: Pei
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Hong Kong, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Advance Welding and Joining, Harbin Institute of Technology , Harbin 150001, China.
authors.forename: Huiyuan
authors.initials: H
authors.lastname: Geng
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Hong Kong, China.|Shenzhen Research Institute, City University of Hong Kong , Shenzhen 518000, China.
authors.forename: Chunyi
authors.initials: C
authors.lastname: Zhi
keywords: cycling stability; electropolymerization; flexible supercapacitors; molecular ordering; polypyrrole