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《能源化学(英文版)》 2019-08
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Micro–meso-macroporous FeCo-N-C derived from hierarchical bimetallic FeCo-ZIFs as cathode catalysts for enhanced Li-O_2 batteries performance

Fufang Chao;Baoxing Wang;Jiaojiao Ren;Yingwei Lu;Wenrui Zhang;Xizhang Wang;Lin Cheng;Yongbing Lou;Jinxi Chen;School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Southeast University;Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Lab for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University;  
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 "MFeCo-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 O_2 capture as well as dictate the nucleation and early-stage deposition of Li_2O_2,the mesopores provided a channel for the electrolyte wetting, and the macroporous structure promoted more available active sites when used as cathode for Li-O_2 batteries. More importantly, M-Fe CoN-C-0.2 based cathode showed a high initial capacity(18,750 mAh g~(-1)@0.1 A g~(-1)), good rate capability(7900 m Ah g~(-1)@0.5 A g~(-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 mA h g~(-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 micro–meso-macroporous structure. The results showed that hierarchical FeCo-N-C architectures are promising cathode catalysts for Li-O_2 batteries.
【Fund】: sponsored by the National Natural Science Foundation of China(21475021 and 21427807);; the Fundamental Research Funds for the Central Universities(2242017 K41023)
【CateGory Index】: TM912;O643.36
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