09:30 〜 11:30
▲ [12a-PA2-32] Synergetic pore structure optimization and nitrogen doping of 3D porous graphene for high performance Oxygen Reduction Reaction
キーワード：ORR, hierarchical porosity, nitrogen doped graphene
Efficient nonprecious metal oxygen reduction reaction (ORR) is key for the commercial viability of fuel cells, metal air batteries, and water splitting systems. Herein, we report a new approach to design and prepare a 3D N doped porous carbon that exhibits outstanding ORR activities. A facile strategy is demonstrated to prepare 3 dimensional hierarchical porous nitrogen doped graphene as a ORR caralyst, where urea is employed as both nitrogen doping source and self-removed template for pore structure optimization. The resultant material possesses high surface doping nitrogen content to increase the number of active sites, 3 dimentional interconnected hierarchical porosity for efficient mass transport and conductive network and robust mechanical structure, which give rise to a comprehensive ability for multiscale electron/ion transfer.The oxygen reduction reaction (ORR) catalyzed on 3D porous graphene proceeded via the co existence of two and four electron pathways in alkaline solution, with the four electron pathway being found to be more dominant. Moreover, 3D porous graphene exhibited long term durability and high resistance to methanol oxidation in comparison with the commercial Pt/C catalyst.