title: Polypyrrole shell@3D-Ni metal core structured electrodes for high-performance supercapacitors.
abstract: Three-dimensional (3D) nanometal films serving as current collectors have attracted much interest recently owing to their promising application in high-performance supercapacitors. In the process of the electrochemical reaction, the 3D structure can provide a short diffusion path for fast ion transport, and the highly conductive nanometal may serve as a backbone for facile electron transfer. In this work, a novel polypyrrole (PPy) shell@3D-Ni-core composite is developed to enhance the electrochemical performance of conventional PPy. With the introduction of a Ni metal core, the as-prepared material exhibits a high specific capacitance (726 F g(-1) at a charge/discharge rate of 1 A g(-1)), good rate capability (a decay of 33% in Csp with charge/discharge rates increasing from 1 to 20 A g(-1)), and high cycle stability (only a small decrease of 4.2% in Csp after 1000 cycles at a scan rate of 100 mV s(-1)). Furthermore, an aqueous symmetric supercapacitor device is fabricated by using the as-prepared composite as electrodes; the device demonstrates a high energy density (≈21.2 Wh kg(-1)) and superior long-term cycle ability (only 4.4% and 18.6% loss in Csp after 2000 and 5000 cycles, respectively).
authors.affiliation: School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou Higher Education Mega Center, Waihuan Xi Road No. 230 510006 (P. R. China).
authors.forename: Gao-Feng
authors.initials: GF
authors.lastname: Chen
authors.forename: Yu-Zhi
authors.initials: YZ
authors.lastname: Su
authors.forename: Pan-Yong
authors.initials: PY
authors.lastname: Kuang
authors.forename: Zhao-Qing
authors.initials: ZQ
authors.lastname: Liu
authors.forename: Dao-Yi
authors.initials: DY
authors.lastname: Chen
authors.forename: Xu
authors.initials: X
authors.lastname: Wu
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.forename: Shi-Zhang
authors.initials: SZ
authors.lastname: Qiao
keywords: core-shell structures; electrochemistry; nickel; polypyrrole; supercapacitors