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Issue 45, 2012
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Phosphoric acid-doped sulfonated polyimide and polybenzimidazole blend membranes: high proton transport at wide temperatures under low humidity conditions due to new proton transport pathways

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Abstract

We now demonstrate a new class of a polymer proton exchange membrane for fuel cells, capable of combining low cost and high proton conductivity under low humidity conditions. The novel phosphoric acid (PA)-doped sulfonated polyimide (SPI) and polybenzimidazole (PBI) blend membrane enables proton conductivities of approximately 0.5 and 0.1 S cm−1 at 120 °C and 45%RH and at 30 °C and 30%RH, respectively. These conductivities were approximately two orders of magnitude higher than those of Nafion 117 due to a new proton transport pathway between phosphoric acid and sulfonic acid in the blend membrane. In addition, the membrane showed no signs of performance degradation at 120 °C and 0%RH after 1000 hours of operation, and maintained a proton conductivity value of more than 0.01 S cm−1. Consequently, this material shows promise as a novel proton exchange membrane and may have potential applications for use in fuel cells.

Graphical abstract: Phosphoric acid-doped sulfonated polyimide and polybenzimidazole blend membranes: high proton transport at wide temperatures under low humidity conditions due to new proton transport pathways

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Publication details

The article was received on 11 Jul 2012, accepted on 27 Sep 2012 and first published on 09 Oct 2012


Article type: Paper
DOI: 10.1039/C2JM34529C
J. Mater. Chem., 2012,22, 23767-23772

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    Phosphoric acid-doped sulfonated polyimide and polybenzimidazole blend membranes: high proton transport at wide temperatures under low humidity conditions due to new proton transport pathways

    K. Suzuki, Y. Iizuka, M. Tanaka and H. Kawakami, J. Mater. Chem., 2012, 22, 23767
    DOI: 10.1039/C2JM34529C

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