能源化学(英文版) ›› 2019, Vol. 38 ›› Issue (11): 170-176.DOI: 10.1016/j.jechem.2019.04.005

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In-situ embedding zeolitic imidazolate framework derived Co-N-C bifunctional catalysts in carbon nanotube networks for flexible Zn-air batteries

Bo Lva,b, Sha Zenga,b, Wei Yangb, Jian Qiaob, Chao Zhanga,b, Chengfeng Zhua,b, Minghai Chena,b, Jiangtao Dia,b, Qingwen Lia,b   

  1. a School of Nano-Technology and Nano-Bionics, University of Science and Technology of China, Hefei 230026, Anhui, China;
    b Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, China
  • 收稿日期:2019-01-27 修回日期:2019-03-30 出版日期:2019-11-15 发布日期:2020-12-18
  • 通讯作者: Jiangtao Di, jtdi2009@sinano.ac.cn
  • 基金资助:
    The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (21776154) and the National High Technology Research and Development Program 863 (2012AA051203).

In-situ embedding zeolitic imidazolate framework derived Co-N-C bifunctional catalysts in carbon nanotube networks for flexible Zn-air batteries

Bo Lva,b, Sha Zenga,b, Wei Yangb, Jian Qiaob, Chao Zhanga,b, Chengfeng Zhua,b, Minghai Chena,b, Jiangtao Dia,b, Qingwen Lia,b   

  1. a School of Nano-Technology and Nano-Bionics, University of Science and Technology of China, Hefei 230026, Anhui, China;
    b Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, China
  • Received:2019-01-27 Revised:2019-03-30 Online:2019-11-15 Published:2020-12-18
  • Contact: Jiangtao Di, jtdi2009@sinano.ac.cn
  • Supported by:
    The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (21776154) and the National High Technology Research and Development Program 863 (2012AA051203).

摘要: Recently, the development of high-performance bifunctional oxygen catalysts integrated with flexible conductive scaffolds for rechargeable metal-air batteries has attracted considerable interest, driving by fastgrowing wearable electronics. Herein, we report a flexible bifunctional oxygen catalyst thin film consisting of Co-N-C bifunctional catalysts embedding in carbon nanotube (CNT) networks. The catalyst is readily prepared by pyrolysis of cobalt-based zeolitic imidazolate frameworks (ZIF-67) that are in-situ synthesized in CNT networks. Such catalyst film demonstrates very high catalytic activities for oxygen reduction (onset potential:0.91 V, and half-wave potential:0.87 V vs. RHE) and oxygen evolution (10 mA cm-2 at 1.58 V) reactions, high methanol tolerance property, and long-term stability (97% current retention). Moreover, our integrated catalyst film shows very good structure flexibility and robustness. Based on the obtained film air electrodes, flexible Zn-air batteries demonstrate low charging and discharging overpotentials (0.82 V at 1 mA cm-1) and excellent structure stability in the bending tests. These results indicate that presently reported catalyst films are potential air electrodes for flexible metal-air batteries.

关键词: Air electrodes, Carbon nanotube films, Bifunctional catalysts, Zn-air batteries, Zeolitic imidazolate framework

Abstract: Recently, the development of high-performance bifunctional oxygen catalysts integrated with flexible conductive scaffolds for rechargeable metal-air batteries has attracted considerable interest, driving by fastgrowing wearable electronics. Herein, we report a flexible bifunctional oxygen catalyst thin film consisting of Co-N-C bifunctional catalysts embedding in carbon nanotube (CNT) networks. The catalyst is readily prepared by pyrolysis of cobalt-based zeolitic imidazolate frameworks (ZIF-67) that are in-situ synthesized in CNT networks. Such catalyst film demonstrates very high catalytic activities for oxygen reduction (onset potential:0.91 V, and half-wave potential:0.87 V vs. RHE) and oxygen evolution (10 mA cm-2 at 1.58 V) reactions, high methanol tolerance property, and long-term stability (97% current retention). Moreover, our integrated catalyst film shows very good structure flexibility and robustness. Based on the obtained film air electrodes, flexible Zn-air batteries demonstrate low charging and discharging overpotentials (0.82 V at 1 mA cm-1) and excellent structure stability in the bending tests. These results indicate that presently reported catalyst films are potential air electrodes for flexible metal-air batteries.

Key words: Air electrodes, Carbon nanotube films, Bifunctional catalysts, Zn-air batteries, Zeolitic imidazolate framework