▎ 摘　　要

NOVELTY - Macro-preparation of nitrogen-doped graphene involves uniformly mixing a precursor (a) which is a graphite-like phase carbonitride nanosheet, urea, melamine or cyanamide, with a metal magnesium powder, heating the formed mixture at 700-850 degrees C for 10-360 minutes under an argon atmosphere, naturally cooling to room temperature of 20-25 degrees C to form a brown-black powder, washing the brown-black powder with a diluted acid 2-3 times, and washing the brown-black powder with deionized water 2-3 times, and drying at 50-80 degrees C. When the precursor (a) is graphite-like phase carbonitride nanosheet, the mass ratio of graphite-like phase carbonitride nanosheet with respect to metal magnesium powder is 1:(0.1-1). When the precursor (a) is urea, melamine or cyanamide, the mass ratio of the urea, melamine or cyanamide with respect to metal magnesium powder is 1:(0.05-0.2). USE - Macro-preparation of nitrogen-doped graphene (claimed) used for supercapacitor, adsorption application and catalysis application. ADVANTAGE - The method enables simple, economical and large-scale macro-preparation of nitrogen-doped graphene with high yield, and low equipment requirements. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of nitrogen and sulfur co-doped graphene, which involves using a carbon-nitrogen-sulfur precursor. The carbon-nitrogen-sulfur precursor is a sulfur-doped graphite-like phase carbonitride nanosheet or a sulfur-carbon-nitrogen mixture. The mass ratio of the carbon-nitrogen-sulfur precursor with respect to magnesium metal powder is 1:(0.1-0.8).