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 PO , the COFs (H PO @COFs) realize an ultrahigh proton conductivity of 1.13×10  S cm , 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 PO @COFs as the solid electrolyte membrane for proton exchange resulting in a maximum power density of 81 mW cm and a maximum current density of 456 mA cm , which exceeds all previously reported COF materials.

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http://dx.doi.org/10.1002/anie.201913802DOI Listing

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