▎ 摘　　要

NOVELTY - Preparation of nitrogen-functionalized porous graphene involves synthesizing porous graphene by chemical vapor deposition (CVD) using a CVD system, using ethylene as carbon source and a commercial-grade nickel frame having a thickness of 1.6 mu m and a porosity of 70% as mold, controlling process until the graphene structures completely occupy the nickel frame, removing the frame, obtaining an independent porous graphene, transferring and purifying the porous graphene using 37% Merck hydrochloric acid having concentration of 18.2 M and distilled water, resulting in samples having a thickness of 1.6 mm and a mass density of 12 mg/cm3 with respect to an area of 49 cm2, preparing nitrogen-doped porous graphene by a hydrothermal method, dissolving 0.2135 g urea and 0.4144 g urea in 80 ml deionized water, stirring the solution for 5 minutes in a Teflon (RTM: PTFE)-coated enclosure, and dripping ammonia until the solution pH reaches up to 10. USE - Preparation of nitrogen-functionalized porous graphene for electrochemical devices e.g. fuel cell and electrolyzer for producing electricity. DETAILED DESCRIPTION - Preparation of nitrogen-functionalized porous graphene involves synthesizing porous graphene by chemical vapor deposition (CVD) using a CVD system, using ethylene as carbon source and a commercial-grade nickel frame having a thickness of 1.6 mu m and a porosity of 70% as mold, controlling process until the graphene structures completely occupy the nickel frame, removing the frame, obtaining an independent porous graphene, transferring and purifying the porous graphene using 37% Merck hydrochloric acid having concentration of 18.2 M and distilled water, resulting samples having a thickness of 1.6 mm and a mass density of 12 mg/cm3 with respect to an area of 49 cm2, preparing nitrogen-doped porous graphene by a hydrothermal method, dissolving 0.2135 g urea and 0.4144 g urea in 80 ml deionized water, stirring the solution for 5 minutes in a Teflon (RTM: PTFE)-coated enclosure, dripping ammonia until the solution pH reaches up to 10, adding 2 ml hydrated hydrazine as a reducing agent, introducing the obtained solution into a stainless steel autoclave containing the enclosure, immersing the porous graphene in the solution within the enclosure, heating the autoclave in an oven at 180 degrees C for 3 hours, cooling, removing the porous graphene from the solution, and heat-treating in a controlled nitrogen atmosphere at 200 degrees C for 1 hour and at 600 degrees C for 3 hours.