Enhanced proton conductivity of sulfonated poly(aryl ether ketone sulfone) containing fluorene group by inserting bifunctionalized MOFs

Fenglong Chen, Lingxin Meng, Jingmei Xu, Hongqi Liang, Kuirong Feng, Tian Lan, Jiayin Wang and Qingyuan Shi

Renewable Energy, 2025, vol. 247, issue C

Abstract: The sulfonated poly(aryl ether ketone sulfone) which contains fluorene groups (F-SPAEKS) as proton exchange membranes (PEMs) matrix is prepared. UiO-66-NH2-PO4H2 (PUIN) is synthesized based on UiO-66-NH2 as a template for immobilizing phosphate groups onto MOFs by chemical bonding via Schiff base reaction. UiO-66-SO3H-PO4H2 (SPUIN) is prepared via ring-opening of 1,3-propanesulfonolactone, where -SO3H is introduced at the -NH2 site of PUIN. The hybridized PEMs (FSSPU-X) are obtained by adding SPUIN as fillers into F-SPAEKS polymers. From all prepared PEMs, FSSPU-7 which means the weight ratio of SPUIN is 7 % shows the best performances in comprehensive aspects. The H+ conductivity of FSSPU-7 is enhanced to 247.38 mS cm−1 and the peak power density is 1140 mW cm−2 with 0.48 mg cm−2 Pt/C loading. At the same time, the swelling ratio of FSSPU-7 remains below 17 %. Besides, FSSPU-7 has a maximum tensile strength up to 32.37 MPa. And the proton conductivity of FSSPU-7 is consistently maintained at about 240 mS cm−1 after 144 h of long-term stability test. Therefore, the preparation of PEMs with a high level of performance is expected by introducing phosphoric acid and sulfonic acid bi-functionalized UiO-66 into F-SPAEKS.

Keywords: Sulfonated poly(aryl ether ketone sulfone); UiO-66-SO3H-PO4H2; Proton conductivity; Proton exchange membranes; Fuel cells (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:247:y:2025:i:c:s0960148125007086

DOI: 10.1016/j.renene.2025.123046

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