Abstract: A nitrogen-doped porous carbon material and a preparation method and an application thereof; wherein the nitrogen-doped porous carbon material has a specific surface area of 1600-3500 m2·g?1, mesopores with a pore size of 2-50 nm account for 20-40% of all pores, an average pore size is 2-20 nm, and a mass fraction of nitrogen atoms in the porous carbon material is 13.6-19.3 wt %. When being used as a supercapacitor material, the porous carbon material has a larger specific capacitance and a better capacitance retention rate. At a current density of 0.1 A·g?1, the porous carbon material has a specific capacitance of about 847 F·g?1. After 5000 cycles of charging and discharging, the capacitance retention rate is about 99.7%. Moreover, the porous carbon material features an excellent pore structure distribution, thus providing good CO2 adsorption performance.

Abstract: A device for flexibly separating cold and hot fluid media, including: a tank body, where the tank body is cylindrical and disposed vertically, upper and lower ends of the tank body are respectively provided with a hot fluid inlet and a cold fluid inlet to provide storage space for hot and cold fluids, at least one adsorption layer is provided on a side wall of the tank body, and the adsorption layer is made of a ferromagnetic material or iron; and a thermal insulation board, where the thermal insulation board is of a plate structure and set on a horizontal cross-section of the tank body, with a shape and area matching a horizontal cross-section of the tank body, a sealing strip is arranged along a circumferential direction of the thermal insulation board, the sealing strip is of a hollow structure, the hollow part is evenly filled with adsorption blocks.