【摘 要】
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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
【机 构】
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School of Nano-Technology and Nano-Bionics, University of Science and Technology of China, Hefei 230
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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 mAcm-2 at 1.58V) 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 overpo tentials (0.82 V at 1 mAcm-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.
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