Biomass porous carbons with abundant pore structure, surface functional groups, and excellent electrical conductivity, are widely used for electrode materials. In this work, biomass carbon with 3D mesh structure was loaded with metal sulfide to synthesize porous carbon-based ultrathin Ni₃S₂ layered nanosheet structure supercapacitor composite material electrode. C/Ni₃S₂-16 showed 600 F g⁻¹ of high specific capacitance with 20 A g⁻¹ current density. After 5,000 charge and discharge cycles, 88.8% of the maximum (imital) specific capacitance was maintained at 10 A g⁻¹. The assembled C/Ni₃S₂-16//C asymmetric supercapacitor achieved an energy density of up to 35.7 Wh Kg⁻¹, which was remained at 27.9 Wh Kg⁻¹ with a high power density at 1500 W kg⁻¹. Developed pore structure of biomass porous carbon provide sufficient space for the electrolyte in and out of the electrode, therefore the potentially high electrochemical activity and energy density of the transition metal sulfide were fully exhibited.

生物质多孔碳具有丰富的孔结构、表面官能团和优异的导电性，被广泛用于电极材料。在这项工作中，具有3D网状结构的生物质碳负载金属硫化物以合成多孔碳基超薄Ni ₃ S ₂层状纳米片结构超级电容器复合材料电极。C/Ni ₃ S ₂ -16 显示出600 F g ^-1的高比电容和20 A g ^{-1 的}电流密度。在 5,000 次充电和放电循环后，最大（imital）比电容的 88.8% 保持在 10 A g ^-1。组装好的C/Ni ₃ S ₂-16//C 非对称超级电容器实现了高达 35.7 Wh Kg ^-1的能量密度，保持在 27.9 Wh Kg ^-1，具有 1500 W kg ^-1的高功率密度。生物质多孔碳发达的孔结构为电解液进出电极提供了足够的空间，因此充分展示了过渡金属硫化物潜在的高电化学活性和能量密度。