▎ 摘　　要

NOVELTY - Nitrogen-doped graphene contains 3-12 wt.%, preferably 4-12 wt.% of nitrogen, calculated as N, based on the total weight of carbon and nitrogen contained in the nitrogen-doped graphene. USE - The nitrogen-doped graphene is useful for producing an aerogel, an electrode (where the electrode is an electrode for fuel cells, preferably for fuel cells operating under acidic conditions, or, alternatively preferably, for fuel cells operating under alkaline conditions), a battery, a supercapacitor, preferably an all solid state supercapacitor, or a catalyst, preferably an electrocatalyst for oxygen reduction reactions (all claimed). ADVANTAGE - The nitrogen-doped graphene can be effectively and efficiently used as catalyst, preferably as electrocatalyst for oxygen reduction reactions, as or in electrodes, in supercapacitors or in batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparing nitrogen-doped graphene, which involves: (i) treating graphene oxide with a nitrogen-containing compound selected from cyanamide, dicyandiamide, melamine, melam, melem, melon, urea, ethylene diamine, ammonia, mixtures of these compounds and mixtures of these compounds with barbituric acid, cyanuric acid and/or cyanuric chloride; and (ii) heating the resulting mixture; (2) nitrogen-doped graphene, obtainable by the process above; (3) an aerogel based on nitrogen-doped graphene; (4) use of the aerogel as or in electrodes, in batteries, in supercapacitors, preferably in all solid state supercapacitors, or as catalysts, preferably as electrocatalysts for oxygen reduction reactions; (5) an electrode comprising nitrogen-doped graphene and/or the aerogel; (6) a catalyst comprising nitrogen-doped graphene and/or the aerogel; and (7) an all solid state supercapacitor (ASSS) comprising nitrogen-doped graphene and/or the aerogel and/or the electrode.