Journal
MOLECULES
Volume 27, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/molecules27020364
Keywords
anion exchange membrane; ionic conductivity; poly(arylene ether sulfone); alkaline stability; crosslink; fuel cell; low water uptake; quaternary piperidinium
Funding
- National Research Foundation of Korea Grant
- Korean Government (MEST) [NRF 2018M3D1A1058624]
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Alkaline stable anion exchange membranes based on cross-linked poly(arylene ether sulfone) grafted with dual quaternary piperidine units (XPAES-DP) were synthesized. The XPAES-DP membrane showed higher ionic conductivity and tensile strength compared to linear PAES based membranes. The chemical stability and consistent ionic conductivity of XPAES-DP membrane make it suitable for anion exchange membrane fuel cell applications. The single-cell assembled with XPAES-DP membrane exhibited high power density.
Alkaline stable anion exchange membranes based on the cross-linked poly(arylene ether sulfone) grafted with dual quaternary piperidine (XPAES-DP) units were synthesized. The chemical structure of the synthesized PAES-DP was validated using H-1-NMR and FT-IR spectroscopy. The physicochemical, thermal, and mechanical properties of XPAES-DP membranes were compared with those of two linear PAES based membranes grafted with single piperidine (PAES-P) unit and conventional trimethyl amine (PAES-TM). XPAES-DP membrane showed the ionic conductivity of 0.021 S cm(-1) at 40 degrees C which was much higher than that of PAES-P and PAES-TM because of the possession of more quaternary ammonium groups in the cross-linked structure. This cross-linked structure of the XPAES-DP membrane resulted in a higher tensile strength of 18.11 MPa than that of PAES-P, 17.09 MPa. In addition, as the XPAES-DP membrane shows consistency in the ionic conductivity even after 96 h in 3 M KOH solution with a minor change, its chemical stability was assured for the application of anion exchange membrane fuel cell. The single-cell assembled with XPAES-DP membrane displayed a power density of 109 mWcm(-2) at 80 degrees C under 100% relative humidity.
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