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Lin, Chao; Ma, Huayun; He, Jun‐Ru; Xu, Qing; Song, Meng; Cui, Cheng‐Xing; Chen, Yong; Li, Chun‐Xiang; Jiao, Mingli; Zhai, Lipeng
Small (Weinheim an der Bergstrasse, Germany), 07/2024Journal Article
Abstract Despite the challenges associated with the synthesis of flexible metal‐covalent organic frameworks (MCOFs), these offer the unique advantage of maximizing the atomic utilization efficiency. However, the construction of flexible MCOFs with flexible building units or linkages has rarely been reported. In this study, novel flexible MCOFs are constructed using flexible building blocks and copper clusters with hydrazone linkages. The heterometallic frameworks (Cu, Co) are prepared through the hydrazone linkage coordination method and evaluated as catalysts for the oxygen evolution reaction (OER). Owing to the spatial separation and functional cooperation of the heterometallic MCOF catalysts, the as‐synthesized MCOFs exhibited outstanding catalytic activities with an overpotential of 268.8 mV at 10 mA cm –2 for the OER in 1 M KOH, which is superior to those of the reported covalent organic frameworks (COFs)‐based OER catalysts. Theoretical calculations further elucidated the synergistic effect of heterometallic active sites within the linkages and frameworks, contributing to the enhanced OER activity. This study thus introduces a novel approach to the fundamental design of flexible MCOF catalysts for the OER, emphasizing their enhanced atomic utilization efficiency.
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