Controllable synthesis of cross-linked CoAl-LDH/NiCo2S4 sheets for high performance asymmetric supercapacitors. Issue 16 (November 2017)

• Record Type: Journal Article
• Authors: Zhang, Xiao; Wang, Senlin; Xu, Lin; He, Taobin; Lu, Fengxia; Li, Huichang; Ye, Junhui
• Is Part Of: Ceramics international. Volume 43:Issue 16(2017)
• Page Start: 14168
• Page End: 14175
• Publication Date: 2017-11
• Subjects: Cross-linked CoAl-LDH/NiCo2S4 sheets -- Hydrothermal -- Electrodeposition -- Asymmetric supercapacitor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.07.159
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Cross-linked CoAl-LDH/NiCo2 S4 sheets hybrids hold a promising electrochemical material for high-performance supercapacitors. In this paper, we report a simple strategy for fabricating flocculent NiCo2 S4 decorated on CoAl-LDH nanosheets to form integrated hybrid architectures (CoAl-LDH/NiCo2 S4 ) via hydrothermal and electrodeposition method. Benefiting from the integrated structures of CoAl-LDH/NiCo2 S4 sheets, which can provide a short diffusion path for electrolyte ions and a high utilization rate for electrode materials, the resultant CoAl-LDH/NiCo2 S4 hybrid electrode exhibits a high specific capacity of 1.52 C cm −2 （760 C g −1 ）at the current density of 2 mA cm −2, a superior rate capability of 78.94% when the current density is increased to 10 mA cm −2, much higher than the simple CoAl-LDH nanosheets electrode. An asymmetric supercapacitor fabricated using the cross-linked CoAl-LDH/NiCo2 S4 hybrids as the positive electrode and 3D reduced graphene oxide (rGO) aerogel as negative electrode shows a high energy density of 44.67 W h kg −1 at a power density of 0.4 kW kg −1, and an energy density of 24.4 W h kg −1 can be retained even at a high power density of 4.0 kW kg −1 .