Abstract
Constructing suitable nanostructures can provide a large specific surface area for storing charge. A 3D layered CoS@CoS2 composite electrode film grown on activated shaddock peel‐derived carbon (ASPC‐CoS@CoS2) was prepared by a simple hydrothermal method in this work. The specific capacitance of the ASPC‐CoS@CoS2 is 1160 F g−1 at 1.0 A g−1. When assembled into a supercapacitor (ASC: ASPC‐CoS@CoS2//ASPC), the ASC device achieved an energy density of 40.4 Wh kg−1 at 364.5 W kg−1. This enhancement in performance can be ascribed to the unique layered porous structure.
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