title: Three-dimensional hierarchical NiCo2O4 nanowire@Ni3S2 nanosheet core/shell arrays for flexible asymmetric supercapacitors.
abstract: Three-dimensional (3D) hierarchical NiCo2O4@Ni3S2 core/shell arrays on Ni foam were synthesized by a facile, stepwise synthesis approach. The 3D heterogeneous NiCo2O4 nanostructure forms an interconnected web-like scaffold and serves as the core for the Ni3S2 shell. The as-prepared NiCo2O4@Ni3S2 nanowire array (NWA) electrodes exhibited excellent electrochemical performance, such as high specific areal capacitance and excellent cycling stability. The specific areal capacitance of 3.0 F cm(-2) at a current density of 5 mA cm(-2) is among the highest values and the only 6.7% capacitance decay after 10 000 cycles demonstrates the excellent cycling stability. A flexible asymmetric supercapacitor (ASC) was fabricated with activated carbon (AC) as the anode and the obtained NiCo2O4@Ni3S2 NWAs as the cathode. The ASC device exhibited a high energy density of 1.89 mW h cm(-3) at 5.81 W cm(-3) and a high power density of 56.33 W cm(-3) at 0.94 mW h cm(-3). As a result, the hybrid nanoarchitecture opens a new way to design high performance electrodes for electrochemical energy storage applications.
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
authors.forename: Dezhi
authors.initials: D
authors.lastname: Kong
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg.
authors.forename: Zhi Xiang
authors.initials: ZX
authors.lastname: Huang
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg.
authors.forename: Runwei
authors.initials: R
authors.lastname: Mo
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg.
authors.forename: Ye
authors.initials: Y
authors.lastname: Wang
authors.affiliation: CSIRO Manufacturing Flagship, P.O. Box 218, Bradfield Road, Lindfield, New South Wales 2070, Australia.
authors.forename: Zhaojun
authors.initials: Z
authors.lastname: Han
authors.affiliation: Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Cheng
authors.affiliation: Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. yanghuiying@sutd.edu.sg.
authors.forename: Hui Ying
authors.initials: HY
authors.lastname: Yang