Porous nanosheet–nanosphere@nanosheet FeNi2-LDH@FeNi2S4 core–shell heterostructures for asymmetric supercapacitors

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 52; no. 34; pp. 12119 - 12129
• Main Authors: Min, Xiaoqin, Zhitao Bo, Xu, ZhiKun, Feng, Junhui, Lin, Xiaoyun, Ni, Yongnian
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 29.08.2023
• Subjects: Activated carbon; Asymmetry; Bimetals; Electrochemical analysis; Electrode materials; Electrodes; Flexible structures; Heterostructures; Metal foams; Nanosheets; Nanospheres; Oxidation; Supercapacitors
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d3dt01902k

Transition bimetallic sulphides have emerged as important electrode materials for supercapacitors owing to their low toxicity, environmental friendliness, cost-effectiveness, multiple oxidation states, high natural abundance, flexible structure, and high theoretical specific capacitance. Herein, a porous nanosheet–nanosphere@nanosheet FeNi2-LDH@FeNi2S4 (FNLDH@FNS) core–shell heterostructure was directly prepared on nickel foam (NF) via a two-step hydrothermal method. The prepared electrode material exhibits an outstanding electrochemical performance. The specific capacity (Cs) values are 806 and 450 C g−1 at current density (Dc) values of 1 and 6 A g−1, respectively, revealing a satisfactory magnification performance. In addition, the FNLDH@FNS electrode exhibits a long cycle life with an supercapacitor (SC) retention rate of 92.3% after 5000 cycles at a Dc of 6 A g−1. The FNLDH@FNS//activated carbon (AC) asymmetric SC assembled with FNLDH@FNS (positive electrode) and activated carbon (AC, negative electrode) displays an energy density (Ed) of 36.67 Wh kg−1 and a power density (Pd) of 775.17 W kg−1.