A dual NiCo metal-organic frameworks derived NiCo2S4 core-shell nanorod arrays as high-performance electrodes for asymmetric supercapacitors

• Published in: Electrochimica acta 2021-04, Vol.374, p.137794, Article 137794
• Main Authors: Gong, Jiaxu, Yang, Junxiao, Wang, Jiaheng, Lv, Linlin, Wang, Wei, Pu, Linyu, Zhang, Huan, Dai, Yatang
• Format: Article
• Language: English
• Subjects: Activated carbon; Anodes; Asymmetry; Capacitance; Confine expansion; Core-shell; Core-shell structure; Electrochemical analysis; Electrode materials; Electrodes; Energy storage; Flux density; Metal foams; Metal sulfides; Metal-organic frameworks; MOFs; Nanorods; NiCo2S4; Structural stability; Sulfurization; Supercapacitor; Supercapacitors; Transition metals
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2021.137794

The structural stability of electrode materials is the crux of significantly improve the electrochemical performance of pseudocapacitor electrodes. Herein, we demonstrate the preparation of NiCo2S4 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 NiCo2S4 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 NiCo2S4 electrode also have excellent electrochemical performance when used as an anode of asymmetric NiCo2S4//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.