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Mn, N co-doped Co nanoparticles/porous carbon as air cathode for highly efficient rechargeable Zn-air batteries

Hanzhen Zheng1,§, Fei Ma1,§, Hongcen Yang1, Xiaogang Wu1, Rui Wang1, Dali Jia1, Zhixia Wang1, Niandi Lu1, Fen Ran2, and Shanglong Peng1 (✉)

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1 National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Keywords: bifunctional electrocatalysts, Co-N-C, Mn-doped, Zn-air batteries
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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are generally catalyzed by precious metals (Pt) and metal oxides (IrO2) which still have many shortages including expensive price, poor selectivity and undesirable stability. In this work, we report a Mn0-doped CoNx on N-doped porous carbon (Mn-CoNx/N-PC) composite from carbonizing metal-organic framework (MOF) derivative as the dual-functional catalyst to boost both the ORR and OER performances. Owing to the strong coordination effect between nitrogen and metal elements, the introduction of N can obviously improve the content of Co-N-C active sites for ORR. Meanwhile, the Mn-doping significantly regulates the electronic structure of the Co element and increases the content of Co0 which provide efficient OER active sites. Mn-CoNx/N-PC catalyst delivers super dual-functional activity with a half-wave potential of 0.85 V, better than the 20% Pt/C catalyst (0.82 V). When used in Zn-air batteries for testing, Mn-CoNx/NPC electrocatalyst shows a high power density (145 mW·cm−2) and good cycle performance.
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Mn, N co-doped Co nanoparticles/porous carbon as air cathode for highly efficient rechargeable Zn-air batteries. Nano Res.

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