【摘 要】
：
Developing bifunctional catalysts that increase both the OER and ORR kinetics and transport reactants with high efficiency is desirable.Herein,micro-meso-macroporous FeCo-N-C-X (denoted as “M-FeCo-N-C-X”,X represents Fe/Co molar ratio in bimetallic zeolit
【机 构】
：
School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory of Smart Carbon-Rich Ma
论文部分内容阅读
Developing bifunctional catalysts that increase both the OER and ORR kinetics and transport reactants with high efficiency is desirable.Herein,micro-meso-macroporous FeCo-N-C-X (denoted as “M-FeCo-N-C-X”,X represents Fe/Co molar ratio in bimetallic zeolite imidazole frameworks FeCo-ZIFs) catalysts derived from hierarchical M-FeCo-ZIFs-X was prepared.The micropores in M-FeCo-N-C-X have strong capability in O2 capture as well as dictate the nucleation and early-stage deposition of Li2O2,the mesopores provided a channel for the electrolyte wetting,and the macroporous structure promoted more available active sites when used as cathode for Li-O2 batteries.More importantly,M-FeCoN-C-0.2 based cathode showed a high initial capacity (18,750mAhg 1@0.1Ag-1),good rate capability (7900mAhg 1@0.5Ag-1),and cycle stability up to 192 cycles.Interestingly,the FeCo-N-C-0.2 without macropores suffered relatively poorer stability with only 75 cycles,although its discharge capacity was still as high as 17,200 mAhg-1(@0.1 A g-1).The excellent performance attributed to the synergistic contribution of homogeneous Fe,Co nanoparticles and N co-doping carbon frameworks with special micromeso-macroporous structure.The results showed that hierarchical FeCo-N-C architectures are promising cathode catalysts for Li-O2 batteries.
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