Excellent Electrochemical Performance Hierarchical Co3O4@Ni3S2 core/shell nanowire arrays for Asymmetric Supercapacitors. (20th July 2016)

• Record Type: Journal Article
• Authors: Zhang, Jinfang; Lin, Jianming; Wu, Jihuai; Xu, Rui; Lai, Min; Gong, Chao; Chen, Xin; Zhou, Pei
• Is Part Of: Electrochimica acta. Volume 207(2016)
• Page Start: 87
• Page End: 96
• Publication Date: 2016-07-20
• Subjects: core/shell -- nanowire arrays -- hierarchical -- nickel foam -- asymmetric supercapacitors; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.04.068
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: 3D hierarchical Co3 O4 @Ni3 S2 core(*)/shell nanowire arrays were designed and fabricated. A facile two-step route containing hydrothermal and electrodeposition method was applied. The Co3 O4 @Ni3 S2 //AC asymmetric supercapacitor was successfully assembled and the high energy and power density were achieved. Abstract: Three-dimensional hierarchical Co3 O4 @Ni3 S2 core/shell nanowire arrays were designed and fabricated on nickel foam via a facile two-step route for supercapacitor applications. Compared with the pristine Co3 O4 nanowire arrays and Ni3 S2 nanosheets, the hierarchical nanostructure demonstrates much more excellent capacitive behaviors. The Co3 O4 @Ni3 S2 electrode exhibited an ultrahigh specific capacitance of 1710 F g −1 at 1 A g −1 and 1474 F g −1 at 10 A g −1 . An asymmetric supercapacitor based on Co3 O4 @Ni3 S2 core/shell nanowire arrays on nickel foam as the positive electrode and activated carbon (AC) as negative electrode was successfully assembled. A specific capacitance of 126.6 F g −1 at 1 A g −1 (retaining 83.5% capacity after 5000 cycles at a current density of 2 A g −1 ) and an outstanding energy density of 44.9 Wh kg −1 was achieved. The remarkable electrochemical properties could be attributed to the unique hierarchical architectures of Co3 O4 @Ni3 S2 core–shell nanowire arrays on 3D on nickel foam and a rational combination of two electrochemical pseudocapacitor materials. The results indicate that our asymmetric supercapacitors have great potential in energy storage device applications.