The sandwich structure of ZIF-8 and polydopamine: Preparation of high-performance wood-derived carbon supercapacitor electrodes

Wood-derived carbon is an ideal material for self-supporting electrode supercapacitors based on its anisotropic porous structure and excellent electrical conductivity from natural wood. However, the low specific surface area and space utilization limit the development of performance. This study reports efficient Polydopamine(PDA)/ Metal-organic frameworks (MOF)/Wood supercapacitor electrodes with a sandwich channel structure and a one-step composite method. The assembled supercapacitor electrodes exhibit effect energy density (0.40 mW h cm −2 ), power density (1000 mW cm −2 ), and recycling stability(10,000 cycles - 81.53 %). The fabrication of these sandwich channel structures with 2-methylimidazole zinc salt (ZIF-8) derived carbon increased the specific surface area, which is not only simple and precisely controllable, but SCnitrogen doping was introduced to improve the electrochemical performance by PDA. The one-step composite method could link the wood-derived carbon framework and ZIF-8 interface by PDA enhancement. This study promises prospects for developing high-performance supercapacitors to ensure clean fuel and green energy storage devices.