Controllable synthesis of Co/MnO heterointerfaces embedded in graphitic carbon for rechargeable Zn–air battery |
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| Affiliation: | 1. Institute of Advanced Optical Technologies − Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 8, 91052 Erlangen, Germany;2. Professorship Applied Thermodynamics, Faculty of Mechanical Engineering, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany;3. Institute of Chemical Reaction Engineering (CRT), Department of Chemical and Biological Engineering (CBI), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 3a, 91058 Erlangen, Germany;1. School of Rare Earths, University of Science and Technology of China, Hefei, 230026, PR China;2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, PR China;3. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, PR China;4. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., No. 2 of Tianhe nan 2nd Rd, Guangzhou, Guangdong Province, 510620, PR China;1. College of Electrical Engineering and Automation, Fuzhou University, 350108 Fuzhou, China;2. Fujian Smart Electrical Engineering Technology Research Center, Fuzhou University, 350108 Fuzhou, China;1. National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China;2. Key Laboratory of Fluid and Power Machinery, Xihua University, Ministry of Education, Chengdu 610039, China;3. Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang 212009, China;4. Wenling Fluid Machinery Technology Institute of Jiangsu University, Wenling 317525, China |
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| Abstract: | Owing to the unique geometric and electronic structure, design and synthesis of electrocatalysts with well defined heterointerfaces are essential for clean energy technologies, for instance water-splitting and Zn-air batteries. Herein, a bifunctional electrocatalyst assembled by Co/MnO nanoparticles and nitrogen doping double-sphere carbon (denoted as Co/MnO@N-DSC), was fabricated via a solvothermal and pyrolysis strategy. The Co/MnO@N-DSC catalysts exhibit an enhanced bifunctional oxygen electrocatalytic performance for Oxygen reduction reaction (ORR) (E1/2, 0.84 V vs. RHE) and oxygen evolution reaction (OER) (Eonset, 1.54 V vs. RHE). As an air cathode catalyst, the Co/MnO@N-DSC-based Zn-air battery can afford prime performance, over the commercial noble-metal-based Zn-air battery. Theoretical calculation results indicate that the synergism of Co (111)/MnO (200) heterointerfaces can enhance charge transfer and provide extra electrons for the reaction processes. This work provides a promising manoeuvre to uplift bifunctional catalytic activity by increasing the synergy from heterointerfaces of transition-metal/metal oxide in oxygen electrocatalysis. |
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| Keywords: | Bifunctional electrocatalyst Co/MnO Heterointerface Graphitic carbon Zn-air battery |
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