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The acid doping behavior of polybenzimidazole membranes in phosphoric acid for proton exchange membrane fuel cells

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Abstract

The acid doping behavior of poly(2,2′-(m-phenylene)-5,5′-bibenzimidazole) (PBI) membranes in aqueous phosphoric acid was studied at room temperature. It was found that doping phosphoric acid in the membrane obeyed a multimolecular layer absorption mechanism proposed in this work. Equation, i.e., 1/[L T] B =(1 − C 0/17.5)/2.1, was presented to describe the relationship of the acid doping level of membranes and the concentration of the doping acid in a range of 2–14 mol L−1. The acid doping kinetics as well as the influence of the doped acids on the conductivity and mechanical strength of the PBI membranes was investigated.

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Authors and Affiliations

  1. Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110004, China

    Ronghuan He, Quantong Che & Baoying Sun

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  1. Ronghuan He
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  2. Quantong Che
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  3. Baoying Sun
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Correspondence to Ronghuan He.

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He, R., Che, Q. & Sun, B. The acid doping behavior of polybenzimidazole membranes in phosphoric acid for proton exchange membrane fuel cells. Fibers Polym 9, 679–684 (2008). https://doi.org/10.1007/s12221-008-0107-0

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  • DOI: https://doi.org/10.1007/s12221-008-0107-0

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