Journal
DALTON TRANSACTIONS
Volume 52, Issue 34, Pages 12119-12129Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3dt01902k
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A porous core-shell heterostructure of FeNi2-LDH@FeNi2S4 (FNLDH@FNS) was prepared on nickel foam via a two-step hydrothermal method. The electrode material exhibited excellent electrochemical performance, with high specific capacity values and long cycle life. An asymmetric supercapacitor assembled with FNLDH@FNS and activated carbon (AC) showed high energy density and power density.
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 (C-s) values are 806 and 450 C g(-1) at current density (D-c) 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 D-c 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 (E-d) of 36.67 Wh kg(-1) and a power density (P-d) of 775.17 W kg(-1).
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