▎ 摘　　要

NOVELTY - Preparing porous graphene material, comprises cleaning straw with ethanol and deionized water, drying, cutting, adding dilute sulfuric acid, reacting, allowing to cool to room temperature, filtering, washing to neutral, drying, to obtain pre-carbonized straw, stirring or dispersing pre-carbonized straw in iron salt- and nickel salt- solution, adding zinc salt, evaporating water, baking, drying, washing using 2 M hydrochloric acid, taking out iron and zinc oxide, washing with deionized water, drying, to obtain porous graphene material, and calcining under high-temperature inert gas protection. USE - The porous graphene material is useful for super-capacitor, capacitance-type desalting and lithium-ion battery electrochemical fields. ADVANTAGE - The method produces product having high specific surface area, high graphitization degree, and grading porous structure; is simple, and economical; and has easily controllable conditions. DETAILED DESCRIPTION - Preparing porous graphene material, comprises cleaning straw with ethanol and deionized water, drying, cutting, adding straw with 1-5 wt.% dilute sulfuric acid, where the mass ratio of sulfuric acid and straw is 1-5:5, stirring until hot in a reactor, reacting at 150-180 degrees C for 12-48 hours, allowing to cool to room temperature, filtering, and washing to neutral, drying at 80 degrees C for 12 hours, to obtain a pre-carbonized straw, stirring or dispersing pre-carbonized straw in iron salt- and nickel salt- solution, adding zinc salt, where the ratio of pre-carbonized straw, zinc salt and iron salts or zinc nickel salt, is 1:1-3:6-8, evaporating water at 60 degrees C, baking at 60 degrees C, drying, washing the materials using 2 M hydrochloric acid, taking out iron and zinc oxide, and washing with deionized water to neutral, drying, to obtain porous graphene material, placing the porous graphene material into a tubular furnace, and calcining under high-temperature inert gas protection.