▎ 摘　　要

A 3D hierarchically porous carbon nanocomposite constituting of graphitic carbon nitride (g-C3N4) chemically integrated with reduced graphene oxide (rGO) via covalent CN bonds is reported. This porous nanocomposite has high nitrogen content, large surface area, interconnected porous networks, and good electrical conductivity, and is used to load Pt nanoparticles to form 3D Pt-g-C3N4-rGO catalyst for direct methanol fuel cell anode. The catalyst shows an unusual electrocatalytic ability toward methanol electrooxidation, such as high activity, intriguing poison tolerance, and reliable long-term stability, especially, impressively high electrochemically active specific surface area value of 80.3 m(2) g(-1), which is much higher than those of other catalysts studied in this work and recent state-of-the-art Pt-based nanostructures. The outstanding electrochemical performance may originate from the distinctive advantages of the unique 3D hierarchically porous carbon nanostructure of Pt-g-C3N4-rGO and the synergetic effects of the individual components, for instance, superlative structural stability owing to the covalent interactions between g-C3N4 and rGO, good conductivity and high specific surface area of g-C3N4-rGO, and the large triple-phase boundaries caused by the highly dispersed Pt nanoparticles.