Pyrolysis-Free Covalent Organic Polymer Efficiently Driving Proton-Exchange-Membrane Fuel Cells by Covalent Grafting Strategy
© 2025 Wiley‐VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 37(2025), 34 vom: 02. Aug., Seite e2507549 |
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| Weitere Verfasser: | , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article covalent grafting strategy covalent organic polymer proton exchange membrane fuel cells pyrolysis‐free preparation |
| Zusammenfassung: | © 2025 Wiley‐VCH GmbH. Covalent organic polymers (COPs) have emerged as promising oxygen reduction reaction (ORR) catalysts due to their structural tunability and well-defined active sites. However, their practical application is hindered by inherent electrical conductivity and restricted active site accessibility in bulk configurations. While van der Waals-assembled COP-carbon composites enhance conductivity, persistent stacking, and weak interfaces still impede electron/mass transport during ORR. Herein, a covalent grafting strategy is proposed to fabricate a lamellar COP network COPG, which is achieved by edge-functionalizing COP with aromatic primary amine groups, followed by diazotization reactions and covalent attachment of graphene dispersions. The resulting hybrid exhibits significantly improved active site accessibility and a tenfold increase in conductivity compared to pristine COP. As a result, in 0.1 M HClO4, COP@G delivers an exceptional acidic ORR performance, with a record half-wave potential of 801 mV, surpassing van der Waals-assembled COP-G by 194 mV. When integrated into proton-exchange-membrane fuel cell (PEMFC) cathodes, COP@G demonstrates an order-of-magnitude enhancement in maximum power density compared to conventional COP-carbon composites |
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| Beschreibung: | Date Revised 28.08.2025 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202507549 |