Construction of cobalt sulfide/nickel core-branch arrays and their application as advanced electrodes for electrochemical energy storage. (20th March 2016)

• Record Type: Journal Article
• Authors: Chen, Minghua; Zhang, Jiawei; Xia, Xinhui; Qi, Meili; Yin, Jinghua; Chen, Qingguo
• Is Part Of: Electrochimica acta. Volume 195(2016)
• Page Start: 184
• Page End: 191
• Publication Date: 2016-03-20
• Subjects: Core/shell structure -- cobalt sulfide -- Porous films -- Arrays -- Metal branch; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.02.143
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Self-supported CoS/Ni core-branch arrays prepared by the combination of hydrothermal and electrodeposition methods demonstrate with high specific capacity and good cycling stability. Highlights: Construct porous CoS/Ni core-branch arrays. Core-branch arrays show high Li storage properties. Core-branch structure is favorable for fast ion and electron transfer. Porous conductive metal branch can keep structure stable. Abstract: Design/fabrication of advanced electrodes with tailored functionality is critical for the development of advanced electrochemical devices. Herein, we report a powerful strategy for construction of high-quality cobalt sulfide (CoS)/Ni core-branch arrays via combined methods of hydrothermal and electro-deposition. Electrodeposited thin porous Ni branch is successfully decorated on the CoS nanowires arrays with the help of hydrothermal ZnO nanorods template. Enhanced mechanical stability and improved ion/electron transfer characteristics are achieved in this composite system. As compared to the pure CoS nanowires arrays, the CoS/Ni core-branch arrays show enhanced electrochemical performance with lower polarization, better high-rate capability and superior cycling life. A high capacity of 605 mAh g −1 at 2C and 371 mAh g −1 at 6C is obtained in the composite core-branch system, respectively. Our developed electrode design protocol can be applicable for fabrication of other advanced metal sulfides electrodes for applications in solar cells, batteries and supercapacitors.