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Coordinatively unsaturated single Co atoms immobilized on C_(2)N for efficient oxygen reduction reaction

Nano Research 2023年第2期16卷 2294-2301页

作者： Wenjing Xu Yidong Sun Jiaqi Zhou Maoqi Cao Jun Luo Haili Mao Pengfei Hu Hongfei Gu Huazhang Zhai Huishan Shang Zhi Cai Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Efficient and Comprehensive Utilization of Biomass-based Agricultural and Forestry Wastes of Qiannan Qiannan Normal University for NationalitiesDuyun 558000China School of Physics and Technology and MOE Key Laboratory of Artificial Micro-and Nano-structuresWuhan UniversityWuhan 430072China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Physics Beihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 102206China

Developing cost-effective and high-efficiency oxygen reduction reaction(ORR)catalysts is imperative for promoting the substantial progress of fuel cells and metal-air *** coordination and geometric engineering of single-atom catalysts(SACs)occurred the promising approach to overcome the thermodynamics and kinetics problems in high-efficiency ***,we rationally constructed atomically dispersed Co atoms on porous N-enriched graphene material C_(2)N(CoSA-C2N)for efficient oxygen reduction reaction(ORR).Systematic characterizations demonstrated the active sites for CoSA-C2N is as identified as coordinatively unsaturated Co-N_(2)moiety,which exhibits ORR intrinsic ***,the porous N-enriched graphene framework in C_(2)N could effectively increase the accessibility to the active sites and promote mass transfer rate,contributing to improved ORR ***,CoSA-C_(2)N exhibited superior ORR performance in both acidic and alkaline conditions as well as impressive long-term *** coordination and geometric engineering of SACs will provide a novel approach to advanced catalysts for energy related applications.

关键词： single-atom catalysts unsaturated coordination geometric engineering oxygen reduction reaction porous graphene nitride

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