Molecular Bridging Enables Isolated Iron Atoms on Stereoassembled Carbon Framework To Boost Oxygen Reduction for Zinc-Air Batteries |
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| Authors: | Wenqing Wang Dr. Kun Rui Kaili Wu Yisha Wang Longwei Ke Xin Wang Feng Xu Prof. Yan Lu Prof. Jixin Zhu |
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| Affiliation: | 1. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816 P. R. China;2. Institute of Flexible Electronics (IFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072 P. R. China;3. Center of Nanoelectronics, School of Microelectronics, Shandong University, Jinan, 250100 P. R. China;4. State Key Laboratory of Fire Science, University of Science and Technology of China, 443 Huangshan Road, Hefei, 230027 P. R. China |
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| Abstract: | Realizing the synergy between active site regulation and rational structural engineering is essential in the electrocatalysis community but still challenging. Here, a matrix-confined co-pyrolysis strategy based on molecular bridging is demonstrated to realize highly dispersed Fe atoms on stereoassembled carbon framework. Both polyacrylonitrile matrix and organic linker from metal–organic frameworks (MOFs) provide sufficient N-anchoring sites for the generation of Fe−N4 moieties. A high Fe loading of 2.9 wt.% is readily achieved based on the scalable approach without post-treatment. Owing to the presence of highly exposed Fe−N−C sites and well-tuned pore structures, isolated Fe atoms on porous carbon nanofiber framework (Fe−SA/NCF) exhibits decent oxygen reduction activity and stability in alkaline conditions via a near four-electron path, demonstrating superior performance as air cathode for zinc-air batteries (ZABs) to commercial Pt/C catalyst. |
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| Keywords: | electrospinning MOFs oxygen reduction reaction single atoms zinc-air battery |
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