Add time:07/29/2019         Source:sciencedirect.com

A series of novel tetraphenylphosphonium cation-functionalized polyphosphazenes were successfully synthesized and employed to prepare the corresponding anion exchange membranes. The typical properties of the prepared membranes for fuel cell including swelling ratio, water uptake, ion exchange capacity, tension test, OH− conductivity and alkaline stability have been evaluated. PPMPP-3, one of the ionomer membranes with an IEC value of 0.72 mmol g−1 displayed the hydroxide conductivities of 22.3 mS cm−1 at 80 °C, and showed excellent alkaline stability that only 7.6% and 9.8% hydroxide conductivity degradation was observed after being exposed to 1.0 M KOH at 60 °C and 80 °C for 10 days. The alkaline stability order of the AEMs studied in this work was PPMPP-3 > PPMPP-4 > PPMPP-2 > PPMPP-1. This work provides a feasible method for enhancing the chemical stability of quaternary phosphonium salts which has a promising prospect to commercial application of alkaline fuel cell.

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