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Fast acid-leaching strategy treated hollow cobalt-carbon materials as highly efficient electrochemical catalysts for Zn-air batteries
Yang, Jun1; Long, Jilan1; Chen, Cheng1; Liang, Guangming1; Tang, Bing1; Liu, Xiaohong2; Zhang, Wei3
2021-11-30
摘要Metal-organic frameworks (MOFs) are employed as ideal calcining templates for the synthesis of highly efficient metal-carbon based oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts. However, owing to their high density of metal centers, MOFs derived metal-carbon based catalysts exhibit seriously aggregated metal nanoparticles, which greatly hinders their electrochemical performance. In this work, we synthesize a hollow Co@CN-P catalyst using in situ N,P-doped Co-MOF as a template and then post-treat it using a fast acid-leaching strategy [denoted as Co@CN-P-H+(D)] to remove aggregated, inefficient and unstable metal nanoparticles. In constrast, an impregnation acid-leaching strategy [denoted as Co@CN-P-H+(12 h)] is also investigated in this work. The optimal Co@CN-P-10-750-H+(D) catalyst exhibits enhanced electrochemical performance, with a potential difference between the ORR and OER of only 0.734 V. When used as a cathode catalyst, the Co@CN-P-10-750-H+(D) based liquid Zn-air battery (ZAB) exhibits the highest maximum power density and specific capacity (204.8 mW cm(-2), 790.4 mA h g(-1)). Moreover, the liquid ZAB also delivers a long-term cycling stability (>800 cycles). The Co@CN-P-10-750-H+(D) based solid-state battery also exhibits ultra-high maximum power density, specific capacity and long-term charge-discharge stability. In addition, the ZAB also displays strong practical application.
DOI10.1039/d1qm01293b
发表期刊MATERIALS CHEMISTRY FRONTIERS
页码13
通讯作者Long, Jilan(xlong612@126.com) ; Zhang, Wei(andyzhangwei@163.com)
收录类别SCI
WOS记录号WOS:000729538000001
语种英语