Crosslinked norbornene copolymer anion exchange membrane for fuel cells

By Chao Wang, Biming Mo, Zhenfeng He, Qian Shao, Duo Pan, Evan Wujick, Jiang Guo, Xinling Xie, Xiaofeng Xie, Zhanhu Guo. Journal of Membrane Science, 2018

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Abstract A series of crosslinked anion exchange membranes (AEMs) were prepared through ring-opening metathesis polymerization (ROMP) of tetraalkylammonium-functionalized norbornene derivatives. Dimensional stability and mechanical properties were enhanced by the crosslinker of 2, 2′-(hexane-1,6-diyl) bis(2-methyl-2, 3, 3a, 4, 7, 7a-hexahydro-1H-4, 7-methanoisoindol-2-ium) iodide (b3). The thermal stability, ion exchange capacity (IEC), water uptake, swelling ratio, ion conductivity and mechanic property of the membranes were investigated. The molar ratios of monomer (3aR, 4 S, 7 R, 7aS)− 2-methyl-2-(3-(trimethylammonio)propyl)−2, 3, 3a, 4, 7, 7a-hexahydro-1H-4,7-methanoisoindol-2-ium iodide (a3): norbornene: monomer b3 was 1:6:3, 2:6:2, 3:6:1 in AEM-1, AEM-2, AEM-3. The resultant AEM-3 membrane had an IEC of 2.89 mmol g−1, an ion conductivity of 64.79 mS·cm−1, a water absorption of 12.5% and a tensile strength of 15.18 MPa at 25 °C. The swelling ratio of AEM-1 (the molar ratio of monomer a3: norbornene: monomer b3 was 1:6:3) was 9.28% at 20 °C and 9.92% at 60 °C. The tensile strength of membranes was improved by the crosslinker. A single cell was built with this AEM-3 membrane and the performance was evaluated. A maximum power density of 152 mW cm−2 at 50 °C was demonstrated. The membranes show great promise to serve as membranes for fuel cells due to excellent performances of higher ion conductivity and better dimensional stability.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/f051cfb03eb14c770892618afe51d9d3ec92a7c4

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