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Porous nanosheet-nanosphere@nanosheet FeNi 2 -LDH@FeNi 2 S 4 core-shell heterostructures for asymmetric supercapacitors.

Xiaoqin MinZhitao BoZhiKun XuJunhui FengXiaoyun LinYongnian Ni
Published in: Dalton transactions (Cambridge, England : 2003) (2023)
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 FeNi 2 -LDH@FeNi 2 S 4 (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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