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Combined Intrinsic and Extrinsic Proton Conduction in Robust Covalent Organic Frameworks for Hydrogen Fuel Cell Applications
Author(s) -
Yang Yi,
He Xueyi,
Zhang Penghui,
Andaloussi Yassin H.,
Zhang Hailu,
Jiang Zhongyi,
Chen Yao,
Ma Shengqian,
Cheng Peng,
Zhang Zhenjie
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913802
Subject(s) - covalent organic framework , membrane , proton exchange membrane fuel cell , electrolyte , conductivity , proton , covalent bond , chemical engineering , materials science , fabrication , proton transport , hydrogen , nanotechnology , chemistry , electrode , organic chemistry , medicine , biochemistry , physics , alternative medicine , quantum mechanics , pathology , engineering
Developing new materials for the fabrication of proton exchange membranes (PEMs) for fuel cells is of great significance. Herein, a series of highly crystalline, porous, and stable new covalent organic frameworks (COFs) have been developed by a stepwise synthesis strategy. The synthesized COFs exhibit high hydrophilicity and excellent stability in strong acid or base (e.g., 12 m NaOH or HCl) and boiling water. These features make them ideal platforms for proton conduction applications. Upon loading with H 3 PO 4 , the COFs (H 3 PO 4 @COFs) realize an ultrahigh proton conductivity of 1.13×10 −1 S cm −1 , the highest among all COF materials, and maintain high proton conductivity across a wide relative humidity (40–100 %) and temperature range (20–80 °C). Furthermore, membrane electrode assemblies were fabricated using H 3 PO 4 @COFs as the solid electrolyte membrane for proton exchange resulting in a maximum power density of 81 mW cm −2 and a maximum current density of 456 mA cm −2 , which exceeds all previously reported COF materials.