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

• 作者: Bo Lv Chao Zhang Chengfeng Zhu Jian Qiao Jiangtao Di Minghai Chen Qingwen Li Sha Zeng Wei Yang
• 来源期刊: 能源化学
• 年，卷（期）: 2019,（11）
• 页码范围: 170-176
• 页数: 7页
• 语种: 英文

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 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.