Alkoxy phosphonic acid-functionalized conjugated microporous polymers for efficient and multi-environmental proton conduction

Abstract

Proton-conducting materials are key components of proton exchange membrane fuel cells that can convert chemical fuel into electrical energy directly, efficiently, and without pollution. Despite the creation of various proton-conducting polyelectrolytes over the past decade, there is still a lack of robust electrolytes that can simultaneously satisfy high proton conductivity and multi-environmental conditions. Herein, we designed and synthesized a series of alkoxy phosphonic acid-functionalized conjugated microporous polymers (CMPs) through side-chain engineering and Sonogashira–Hagihara cross coupling. With superior stability, hydrophilic nature and high side-chain mobility, the phosphonated CMPs further serve as robust hosts to accommodate a large number of H3PO4 molecules through hydrogen-bonding, and exhibit high proton conductivity in pelletized powder samples under multi-environment conditions, such as wide temperature range anhydrous proton conductivities of 2.15 × 10−2 and 1.15 × 10−5 S cm−1 at 130 and −40 °C, respectively, and a wide humidity range proton conductivity of 1.87 × 10−2 and 9.93 × 10−2 S cm−1 at 30 °C under 32% relative humidity and 90 °C under 98% relative humidity, respectively. To the best of our knowledge, this is the first example of constructing multi-environmentally adaptable porous organic polymer proton-conducting materials for both humid and anhydrous conditions within a wide temperature range (−40 to 130 °C).

Graphical abstract: Alkoxy phosphonic acid-functionalized conjugated microporous polymers for efficient and multi-environmental proton conduction

Supplementary files

Article information

Article type
Paper
Submitted
19 Sep 2022
Accepted
09 Nov 2022
First published
15 Nov 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2023, Advance Article

Alkoxy phosphonic acid-functionalized conjugated microporous polymers for efficient and multi-environmental proton conduction

K. Yang, Y. Wang, Z. Ling, X. Pan, G. Zhang and J. Su, Mater. Adv., 2023, Advance Article , DOI: 10.1039/D2MA00909A

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