Cation substituted Ni3S2 nanosheets wrapped Zn0.76Co0.24S nanowire arrays prepared with in-situ oxidative etching strategy for high performance solid-state asymmetric supercapacitors. (February 2022)

• Record Type: Journal Article
• Authors: Jia, Henan; Fan, Jiahang; Fan, Yuewen; Feng, Chenchen; Jin, Haize; Cai, Yifei; Liu, Mao-Cheng
• Is Part Of: Journal of energy storage. Volume 46(2022)
• Publication Date: 2022-02
• Subjects: In-situ oxidative etching -- Core-shell -- Zn0.76Co0.24S -- Ni3S2 -- Supercapacitor; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2021.103870
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: An interface bridging connection is constructed between the Zn0.76 Co0.24 S and Zn.Co-doped Ni3 S2 by in-situ oxidative etching ni foam to provide ni source and followed sulfidation process to form sulfides. The obtained ZCS@ZCNS-2 electrode exhibits the high capacitance of 6.4 f cm −2 at 2 mA cm −1, with high-rate capability of 64% due to the structural features. The possible structure and composition evolution mechanisms were presented. Abstract: Engineering the electrodes with multicomponent materials and rational structure are the most effective strategies for high-performance supercapacitors. However, one of the remained challenges is synchronously increasing the structural complexity and promoting redox kinetics. Herein, Zn0.76 Co0.24 [e-mail]-doped Ni3 S2 core-shell electrodes (ZCS@ZCNS) were synthesized through an in-situ oxidative etching and sulfidation process. This process realizes sulfidation and metal atoms doping at the same time, and maintains the efficient interface connection between core and shell materials, which can realize the synergistic effect of each component and hence not only induce more active sites but also enhance conductivity and structural stability. The obtained ZCS@ZCNS electrode exhibits the high specific capacitance of 6.4 F cm −2 at 2 mA cm −2, out-standing rate capabilities of 64% capacity retention at 40 mA cm −2, and excellent cycling stability. Moreover, the obtained ZCS@ZCNS//active carbon liquid-state and solid-state asymmetric supercapacitors can both deliver the high energy density of 50.8 W h kg −1 and 43.9 W h kg −1, respectively. This strategy offers a scalable, simple, and cost-effective approach for the large-scale fabrication of other high-performance metal-sulfide-based electrodes in next-generation electronics. Graphical abstract: Image, graphical abstract