Pyrolysis-Free Covalent Organic Polymer Efficiently Driving Proton-Exchange-Membrane Fuel Cells by Covalent Grafting Strategy

Pyrolysis-Free Covalent Organic Polymer Efficiently Driving Proton-Exchange-Membrane Fuel Cells by Covalent Grafting Strategy

© 2025 Wiley‐VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 37(2025), 34 vom: 02. Aug., Seite e2507549
Auteur principal: Li, Xueli (Auteur)
Autres auteurs: Hou, Jingkui, Leng, Yiming, Liu, Shizhen, Xiang, Zhonghua
Format: Article en ligne
Langue:English
Publié: 2025
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article covalent grafting strategy covalent organic polymer proton exchange membrane fuel cells pyrolysis‐free preparation
Description
Résumé:© 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
Description:Date Revised 28.08.2025
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202507549