Abstract
Highly efficient supercapacitance performance requires electrode materials to have large electrochemical reaction interfaces due to the surface reaction properties. In this work, a hollow-structured NiCo2S4 spinel is synthesized via an in situ preparation strategy. First, NiCo-glycolate solid spheres are obtained via a simple solvothermal method. The hollow structure is formed through a liquid sulfidation approach using NiCo-glycolate solid spheres as a self-sacrificing template, according to the Kirkendall effect. NiCo2S4 with hollow-structured spheres as supercapacitor electrodes exhibits an excellent specific capacitance of 1387.5 F·g–1 at 1 A·g–1 and a highly efficient cycling stability for over 4500 cycles. Moreover, when served as an all-solid-state asymmetric supercapacitor electrode, superior energy density (39 Wh·kg–1) is achieved at the power density of 215 W·kg–1. The superior energy storage performance is ascribed to the unique properties of the NiCo2S4 spinel, the mesoporous structure, and the large hollow space for alleviating the structure strain.
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