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Large-area Free-standing Metalloporphyrin-based Covalent Organic Framework Films by Liquid-air Interfacial Polymerization for Oxygen Electrocatalysis |
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| Authors: | Jiaqi Tang Dr. Zuozhong Liang Haonan Qin Xiangquan Liu Binbin Zhai Zhen Su Qianqian Liu Dr. Haitao Lei Prof. Dr. Kaiqiang Liu Prof. Dr. Chuan Zhao Prof. Dr. Rui Cao Prof. Dr. Yu Fang |
| Affiliation: | 1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119 China These authors contributed equally to this work.;2. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119 China;3. School of Chemistry, The University of New South Wales, Sydney, NSW 2052 Australia |
| Abstract: | Synthesizing large-area free-standing covalent organic framework (COF) films is of vital importance for their applications but is still a big challenge. Herein, we reported the synthesis of large metalloporphyrin-based COF films and their applications for oxygen electrocatalysis. The reaction of meso-benzohydrazide-substituted metal porphyrins with tris-aldehyde linkers afforded free-standing COF films at the liquid-air interface. These films can be scaled up to 3000 cm2 area and display great mechanical stability and structural integrity. Importantly, the Co-porphyrin-based films are efficient for electrocatalytic O2 reduction and evolution reactions. A flexible, all-solid-state Zn-air battery was assembled using the films and showed high performance with a charge–discharge voltage gap of 0.88 V at 1 mA cm−2 and high stability under bent conditions (0° to 180°). This work thus presents a strategy to synthesize functionalized COF films with high quality for uses in flexible electronics. |
| Keywords: | Covalent Organic Framework Film Flexible Zn-Air Battery Metal Porphyrin Oxygen Electrocatalysis |