A dual NiCo metal-organic frameworks derived NiCo2S4 core-shell nanorod arrays as high-performance electrodes for asymmetric supercapacitors. (1st April 2021)

• Record Type: Journal Article
• Authors: Gong, Jiaxu; Yang, Junxiao; Wang, Jiaheng; Lv, Linlin; Wang, Wei; Pu, Linyu; Zhang, Huan; Dai, Yatang
• Is Part Of: Electrochimica acta. Volume 374(2021)
• Publication Date: 2021-04-01
• Subjects: NiCo2S4 -- MOFs -- Core-shell -- Supercapacitor -- Confine expansion; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.137794
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The structural stability of electrode materials is the crux of significantly improve the electrochemical performance of pseudocapacitor electrodes. Herein, we demonstrate the preparation of NiCo2 S4 with core-shell and micro-porous structure on nickel foam as an efficient anode material for asymmetric supercapacitor (ASC) via hydrothermal and co-sulfurization processes. The NiCo2 S4 electrode shows a remarkable specific capacitance of 850.2 C g −1 at 1 A g −1, and retains 93.6 % original capacitance after 5000 cycles. Furthermore, the NiCo2 S4 electrode also have excellent electrochemical performance when used as an anode of asymmetric NiCo2 S4 //Active Carbon (AC) supercapacitor, which generates an energy density as 38.1Wh Kg −1 at 700 W kg −1 and 84.3% capacity retention after 5000 cycles. This work provide an efficiently method to suppress volume expansion during sulfuration reaction by core-shell structure, which potential application in transition metal sulfides electrode materials in electrochemical energy storage and conversion devices.