Hierarchical flower shaped nano-flakes shaped ZnCo2S4@GO for the high performance for asymmetric supercapacitor: Enhanced energy storage applications

Abstract

The great energy density that supercapacitors provide is in critical demand right now. In this work, flower-like nano-flakes shaped ZnCo2S4@GO (Graphene Oxide) by hydrothermal method. ZnCo2S4@GO is used because of its large electroactive surface area, flower-like morphology, and quick channels for ion diffusion and electron transport in the as-prepared hierarchical arrays. The GO-coated ZnCo2S4 delivers a capacity of about 1095F g−1 at 1 A g−1. An asymmetric supercapacitor is fabricated with the assembly of ZnCo2S4@GO (3%) as the positive electrode and activated carbon (AC) as the negative electrode, which delivers a capacity of about 164F g−1. The ASC (asymmetric supercapacitor) delivers a high energy density of about 43 Wh kg−1 with a power density of 38,497 W Kg−1 with a capacity retention of 91% after 10,000 cycles. The better electrochemical results show that ZnCo2S4@GO will be suitable for energy storage applications.