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Polybenzimidazole and butylsulfonate grafted polybenzimidazole blends for proton exchange membrane fuel cells

Lin, Hsiu-Li ; Hu, Chih-Ren ; Lai, Shiau-Wu ; Yu, T. Leon

Journal of Membrane Science, 2012, Vol.389, pp.399-406 [Peer Reviewed Journal]

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  • Title:
    Polybenzimidazole and butylsulfonate grafted polybenzimidazole blends for proton exchange membrane fuel cells
  • Author: Lin, Hsiu-Li ; Hu, Chih-Ren ; Lai, Shiau-Wu ; Yu, T. Leon
  • Description: ► Two PBIs, with 〈 〉 = 9.16 × 10 (PBIh) and 1.60 × 10 g/mol (PBIm), were synthesized. ► Two butylsulfonate grafted PBIs, PBIm-BS (with 22 mole%) and PBIh-BS (with 17 mole%), were synthesized. ► The PBIh/PBIh-BS membranes have better fuel cell performance than PBI and PBIm/PBIm-BS membranes. ► Three factors control the membrane properties, namely: hydrogen bonds, acid–base interactions, and excess free volume. In this work, we synthesize two poly(benzimidazole) (PBIs), i.e., medium molecular weight PBIm and high molecular weight PBIh with 〈 〉 = 9.16 × 10 and 1.60 × 10 g/mol, respectively, and two butylsulfonate grafted PBIs (PBI-BSs), i.e., PBIm-BS and PBIh-BS. In the PBIs, 22 mole% of imidazole groups of PBIm and 17 mole% of imidazole groups of PBIh are grafted with butyl sulfonate groups. The PBIh/PBIh-BS and PBIm/PBIm-BS blend membranes are prepared with various weight (wt) ratios of PBI/PBI-BS. We demonstrate that PBIh/PBIh-BS blend membranes have better mechanical properties, phosphoric acid doping level, proton conductivity, and fuel cell performance than neat PBI and PBIm/PBIm-BS blend membranes. The influences of PBI molecular weight and the Lewis acid–base interaction of PBI-BS butyl sulfonic acids with imidazole groups on the membrane properties and fuel cell performances of PBI/PBI-BS blends are discussed.
  • Is Part Of: Journal of Membrane Science, 2012, Vol.389, pp.399-406
  • Identifier: ISSN: 0376-7388 ; E-ISSN: 1873-3123 ; DOI: 10.1016/j.memsci.2011.11.005
  • Subjects: Poly(Benzimidazole) ; Butylsulfonate Grafted Poly(Benzimidazole) ; Pemfc ; Engineering
  • Language: English

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