Enhanced cycling stability of NiCo2S4@NiO core-shell nanowire arrays for all-solid-state asymmetric supercapacitors

Yuanyuan Huang; Tielin Shi; Shulan Jiang; Siyi Cheng; Xiangxu Tao; Yan Zhong; Guanglan Liao; Zirong Tang

doi:10.1038/srep38620

Enhanced cycling stability of NiCo₂S₄@NiO core-shell nanowire arrays for all-solid-state asymmetric supercapacitors

Sci Rep. 2016 Dec 7:6:38620. doi: 10.1038/srep38620.

Authors

Yuanyuan Huang¹, Tielin Shi^{1

2}, Shulan Jiang³, Siyi Cheng¹, Xiangxu Tao¹, Yan Zhong¹, Guanglan Liao^{1

2}, Zirong Tang^{1

2}

Affiliations

¹ State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
² Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
³ Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China.

Abstract

As a new class of pseudocapacitive material, metal sulfides possess high electrochemical performance. However, their cycling performance as conventional electrodes is rather poor for practical applications. In this article, we report an original composite electrode based on NiCo₂S₄@NiO core-shell nanowire arrays (NWAs) with enhanced cycling stability. This three-dimensional electrode also has a high specific capacitance of 12.2 F cm^-2 at the current density of 1 mA cm^-2 and excellent cycling stability (about 89% retention after 10,000 cycles). Moreover, an all-solid-state asymmetric supercapacitor (ASC) device has been assembled with NiCo₂S₄@NiO NWAs as the positive electrode and active carbon (AC) as the negative electrode, delivering a high energy density of 30.38 W h kg^-1 at 0.288 KW kg^-1 and good cycling stability (about 109% retention after 5000 cycles). The results show that NiCo₂S₄@NiO NWAs are promising for high-performance supercapacitors with stable cycling based on the unique core-shell structure and well-designed combinations.

Publication types

Research Support, Non-U.S. Gov't