Superhigh intrinsic proton conductivity in densely carboxylic covalent organic framework

Herein, we developed for the first time two carboxylic acid based intrinsic proton conductors (COOHCOF-1 and COOH-COF-2) via pre-assembly approach. The obtained COOH-COF-1 and COOH-COF-2 not only show outstanding chemical and thermal stabilities, but also exhibit superhigh intrinsic proton conductive behaviors. Especially, the intrinsic proton conductivity of COOH-COF-2 is up to 2.6 x 10 -3 S/cm at 353 K and 98% RH, which is the highest value among all the reported acid functionalized COFs. This work lights up the way for the rational design of functional COFs with remarkably intrinsic proton conducting performance and related practical applications.& COPY; 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

Here, we report the development of two carboxylic acid based intrinsic proton conductors (COOHCOF-1 and COOH-COF-2) through a pre-assembly approach. The obtained COOH-COF-1 and COOH-COF-2 exhibit remarkable chemical and thermal stability, as well as superhigh intrinsic proton conductivity. COOH-COF-2, in particular, shows an intrinsic proton conductivity of up to 2.6 x 10 -3 S/cm at 353 K and 98% RH, the highest value among all reported acid functionalized COFs. This work provides insight into the rational design of functional COFs with exceptional intrinsic proton conducting performance and potential practical applications.