Mn/Cu nanoclusters-grafted N-doped carbon nanotubes: Robust oxygen electrode catalysts for Zn-air batteries |
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| Affiliation: | 1. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, 7186 Weixing Road, Changchun, 130022, PR China;2. School of Materials Science and Engineering & Electron Microscopy Center, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China;3. Department of Chemistry and Chemical Biology & Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ, 08854, USA;1. State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin Campus, Panjin, 124221, China;2. Department of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China;3. Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 808-0196, Japan;4. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan;5. Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou, 450007, China;1. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China;2. Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang University of Science and Technology, Shouguang 262700, PR China;3. Key Laboratory of Fuel Cell Technology of Guangdong Province, South China University of Technology, Guangzhou 510640, PR China;4. Department of Physics, Hamline University, St. Paul 55104, USA |
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| Abstract: | Developing efficient nonprecious electrocatalysts that can drive the oxygen electrode reactions in zinc-air batteries (ZABs) is important but remains challenging. In this work, novel materials comprising Mn/Cu nanoclusters-grafted N-doped carbon nanotubes are synthesized by preparing and then pyrolyzing Mn/Cu polyphthalocyanine-encapsulated carbon nanotubes (CNTs), followed by treating the products with acidic solution. The materials are named CNTs@(Mn,Cu)PPc-T, where T denotes the pyrolysis temperature in °C, and they are demonstrated to serve as efficient oxygen electrode catalysts for zinc-air batteries (ZABs). Among them, the one synthesized at 900 °C, CNTs@(Mn,Cu)PPc-900, requires more positive onset and half-wave potentials for reduction of oxygen and a low overpotential for the evolution of oxygen. A rechargeable ZAB assembled with CNTs@(Mn,Cu)PPc-900 electrocatalyst delivers a high power density (158.5 mW cm−2) and displays an excellent stability in 200 cycles of charge/discharge (in over 33 h). Such performance is even superior to that of a ZAB containing the benchmark Pt/C + RuO2 catalyst as an air cathode under identical testing condition. |
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| Keywords: | Zinc-air battery Mn/Cu nanocluster Polyphthalocyanine Oxygen electrocatalyst Carbon nanotubes |
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