▎ 摘　　要

NOVELTY - A heteroatom-doped layered graphene is prepared by sonicating boron carbide (B4C) and water at molar ratio of 0.5-3 for 1 hour, adding melamine to mixture at ratio of 1:0.2-2 of melamine to B4C, stirring, thermally treating homogeneous solution at 80 degrees C for 6 hours, filtering, air-drying thermally treated solution at 50 degrees C for 12 hours to obtain powder, thermally treating powder or B4C powder at 1000-1600 degrees C in nitrogen (N2) gas atmosphere for 30-180 minutes, cooling after 30 minutes under N2 gas atmosphere, and separating product from unreacted B4C using water dispersion technique. USE - Preparation of heteroatom-doped layered graphene from boron carbide for electronic and electrochemical devices, such as transparent displays, dye sensitized solar cells, energy storage devices, such as super capacitors, batteries, and fuel cells (all claimed). Can also be used for fabrication of cathode materials and catalysts for various electrochemical processes. ADVANTAGE - The carbide-derived heteroatom-doped graphene shows good electrocatalytic performance in oxygen reduction reaction and follows an energy efficient four-electron transfer pathway. The preparation process is a single step method which results in high yield of high quality heteroatom-doped graphene. Electrodes developed using the method can reduce cost, energy consumption, and weight of electrochemical cells significantly.