Silicon-oxy-carbide intercalated three-dimensional graphene hybrid membrane for all-solid-state supercapacitors

Abstract

The demand for high-performance energy storage solutions has driven research towards advanced electrode materials. In this study, a graphene-based hybrid membrane, containing intercalated silicon-oxy-carbide (SiOC), was fabricated using a novel method that combines flow-directed assembly and vapour reduction. This hybrid membrane not only enhances electrolyte transport owing to its three-dimensional network structure but also capitalises on the synergistic advantages of graphene and SiOC owing to strong coupling forces. When compared to individual graphene and SiOC, the resulting flexible all-solid-state symmetric supercapacitor device (ASSSs) demonstrated superior capacitance performance, in terms of a high power density of 8000 W·kg−1 at an energy density of 17.5 W·h·kg−1 and a high energy density of 86.8 W·h·kg−1 at 600 W·kg−1, all within a wide potential window of 0–2.0 V. This innovative methodology has far-reaching implications, offering a straightforward and efficient strategy for designing and preparing three-dimensional (3D) graphene-based membrane electrodes with potential applications in flexible energy storage devices.