Nafion-Azole-H₃PO₄ Composite Membranes Using Solution Processing for High Temperature PEMFCs

Abstract

Nafion-azole-H3PO4 composite membranes were prepared by autoclave solution processing for high temperature PEMFCs. Azole molecular such as benzimidazole (bz), 1,2,3-triazole, pyrazole, imidazole, 1,2,4-triazole was used as a supporter to make much incorporation of phosphoric acid and homogeneous composite membrane between perfluorosulfonic polymer (Nafion) and phosphoric acid. The Nafion-azole-H3PO4 composite membrane was flexible. The conductivity of 0.23 and 0.01 S/cm at the temperature of 150 oC, dry was obtained at the Nafion-bz-H3PO4 and Nafion-1,2,3-triazole-H3PO4 composite membranes, respectively. The power density of 35 mW/cm2 was obtained at the Nafion-bz-H3PO4 composite membrane.

Nafion-Initiated ATRP of 1-Vinylimidazole for Preparation of Proton Exchange Membranes

“…Azoles, such as imidazole, ,− pyrazole, triazole and tetrazole, etc., − are promising alternative PEM materials or additives, especially under high-temperature conditions. Protons can be easily picked by the N atoms in the heterocyclic rings of azoles, and these protonated N atoms are able to deliver effectively the protons to neighboring proton acceptors to accomplish the proton conduction.…”