A flexible asymmetric supercapacitor assembled by dahlia-like core–shell cobalt/tin-based chalcogenide@nickel hydroxide grown on reduced graphene oxide

Abstract

Tin-based chalcogenides are generally supposed to be some of the most promising electrode materials with their unique characteristics like facile synthesis, low cost, and eco-friendliness. Nevertheless, the tin-based chalcogenides have low intrinsic conductivity, severe volume effect and electrochemical driven hysteresis, as applied directly to the materials used as supercapacitor electrodes, impeding additional advancements in their electrochemical properties. Therefore, tin-based chalcogenides, especially stannous sulfide, are less reported in the field of supercapacitors. To alleviate these problems, a dahlia-like stannous sulfide-based composite (rCSCTN) has been achieved by in situ growth of dahlia-like core–shell cobalt/tin-based chalcogenide@nickel hydroxide on graphene layers. The synthesis strategy can effectively enhance the electrochemical reaction kinetics of the material for electrodes while also improving the supercapacitor properties of the electrode materials by means of the mechanisms of energy storage active site intervention and multi-component synergistic effect. Furthermore, a PVA/KOH gel-electrolyte can be used to create a malleable and highly tensile rCSCTN/PVA/KOH film electrode that can curve at a variety of angles. The constructed supercapacitor apparatus can operate a multipurpose display for more than 12 min in real-world applications. As a result, this innovative study provides fresh motivation for creating composite electrodes for flexible asymmetric supercapacitors that are based on tin-based chalcogenides.