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

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

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.

Suggested Citation

  • Chen, Fenglong & Meng, Lingxin & Xu, Jingmei & Liang, Hongqi & Feng, Kuirong & Lan, Tian & Wang, Jiayin & Shi, Qingyuan, 2025. "Enhanced proton conductivity of sulfonated poly(aryl ether ketone sulfone) containing fluorene group by inserting bifunctionalized MOFs," Renewable Energy, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:renene:v:247:y:2025:i:c:s0960148125007086
    DOI: 10.1016/j.renene.2025.123046
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    References listed on IDEAS

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    1. Pal, Sandip & Mondal, Rakhi & Chatterjee, Uma, 2021. "Sulfonated polyvinylidene fluoride and functional copolymer based blend proton exchange membrane for fuel cell application and studies on methanol crossover," Renewable Energy, Elsevier, vol. 170(C), pages 974-984.
    2. Khomein, Piyachai & Ketelaars, Wesley & Lap, Tijs & Liu, Gao, 2021. "Sulfonated aromatic polymer as a future proton exchange membrane: A review of sulfonation and crosslinking methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    3. Nagar, Harsha & Sahu, Nivedita & Basava Rao, V.V. & Sridhar, S., 2020. "Surface modification of sulfonated polyethersulfone membrane with polyaniline nanoparticles for application in direct methanol fuel cell," Renewable Energy, Elsevier, vol. 146(C), pages 1262-1277.
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