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Core-shell-structured Co@Co4n nanoparticles encapsulated into MnO-modified porous n-doping carbon nanocubes as bifunctional catalysts for rechargeable Zn–air batteries

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Journal of Energy Chemistry 2020年第11期29卷 52-62页

作者： Fengmei Wang Huimin Zhao Yiru Ma Yu Yang Bin Li Yuanyuan Cui Ziyang Guo Lei Wang Key Laboratory of Eco-Chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai University.Tianjin 300071China Shimadzu China Co. LTD.Shanghai 200233China

Designing the highly catalytic activity and durable bifunctional catalysts toward oxygen reduction/evolution reaction(ORR/OER) is paramount for metal–air batteries. Metal–organic frameworks(MOFs)-based materials have attracted a great deal of attention as the potential candidate for effectively catalyzing ORR/OER due to their adjustable composition and porous structure. Herein, we first introduce the Mn species into zeolitic-imidazole frameworks(ZIFs) and then further pyrolyze the Mn-containing bimetallic ZIFs to synthesize core-shell-structured Co@Co4n nanoparticles embedded into MnO-modified porous n-doped carbon nanocubes(Co@Co4n/MnO–nC). Co@Co4n/MnO–nC exhibits the outstanding catalytic activity toward ORR and OER which is attributed to its abundant pyridinic/graphitic n and Co4n,the optimized content of MnO species, highly dispersed catalytic sites and porous carbon matrix. As a result, the Co@Co4n/MnO–nC-based Zn–air battery exhibits enhanced performances, including the high discharge capacity(762 mA h gZn-1), large power density(200.5 mW cm-2), stable potential profile over 72 h, low overpotential(nd superior cycling life(2800 cycles). Moreover, the belt-shaped Co@Co4n/MnO–nC cathode-based Zn–air batteries are also designed which exhibit the superb electrochemical properties at different bending/twisting conditions.

关键词： Co@Co4n nanoparticles n-doped carbon nanocubes MnO species Flexibility Zn–air battery

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