Abstract
Abstract High electrical conductivity and rational design of structures are two crucial routes to improving the electrochemical performance of electrode materials. However, highly conductive electrode materials with short ion-transport paths remain a challenge in energy storage. Here, we propose manganese cobalt sulfide (MnCo 2 S 4 ) nanowire wrapping by a flocculent shell layer using a facile hydrothermal method with post-sulfurization treatment. The resultant MnCo 2 S 4 electrode employed for supercapacitor delivered a remarkable specific capacitance of 2067 F g −1 at the current density of 1 A g −1 , good rate capability, and excellent cycling stability. Moreover, an asymmetric supercapacitor device was successfully assembled using MnCo 2 S 4 and reduced graphene oxide (rGO) as electrodes, achieving a high energy density of 31.3 W kg −1 at a power density of 800 W kg −1 . With such outstanding electrochemical performance, this asymmetric supercapacitor device holds great potential in developing high-energy-storage applications.
Published Version
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