Designing a novel ternary transition metal sulfide electrode for high-performance structural supercapacitors

Structure supercapacitors (SSC) have aroused tremendous interest in building energy storage due to their dual function of electrochemical-mechanical properties. As well known, the low energy storage capacity limits their development. To enhance the energy density of SSC, lots of high-performance structural electrodes were developed. Herein, Mg and S elements were used to regulate the microstructure of the binary metal hydroxide, which could improve the electrode’s electrochemical performance. As we expected, rGO/N₁C₃Mg-S₄′ electrode exhibits high areal capacitance (10.20F/cm²), which boosts the electrochemical capacitance of SSC. Our device based on rGO/N₁C₃Mg-S₄′ electrode exhibits a high areal capacitance (179.21 mF/cm²) and a high energy density (56 μWh/cm²) at 3 mA/cm². More importantly, the electrochemical performance of our device doesn’t change obviously under a certain amount of pressure, demonstrating its good practical application potential in buildings.