Synthesis and characterization of H3PO4 doped poly(benzimidazole-co-benzoxazole) membranes for high temperature polymer electrolyte fuel cells

Title
Synthesis and characterization of H3PO4 doped poly(benzimidazole-co-benzoxazole) membranes for high temperature polymer electrolyte fuel cells
Authors
이혜진이동훈헨켄스마이어디억장종현조은애김형준Hwayong Kim
Keywords
High temperature PEMFC; Polybenzimidazole; High-temperature polymer electrolyte fuel cell; Membrane electrode assembly; Poly(benzimidazole-co-benzoxazole)
Issue Date
2012-10
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 33, NO 10, 3279-3284
Abstract
Poly(benzimidazole-co-benzoxazole)s (PBI-co-PBO) are synthesized by polycondensation reaction with 3,3'- diaminobenzidine, terephthalic acid and 3,3'-dihydroxybenzidine or 4,6-diaminoresorcinol in polyphosphoric acid (PPA). All polymer membranes are prepared by the direct casting method (in-situ fabrication). The introduction of benzoxazole units (BO units) into a polymer backbone lowers the basic property and H3PO4 doping level of the copolymer membranes, resulting in the improvement of mechanical strength. The proton conductivity of H3PO4 doped PBI-co-PBO membranes decrease as a result of adding amounts of BO units. The maximum tensile strength reaches 4.1 MPa with a 10% molar ratio of BO units in the copolymer. As a result, the H3PO4 doped PBI-co-PBO membranes could be utilized as alternative proton exchange membranes in high temperature polymer electrolyte fuel cells.
URI
http://pubs.kist.re.kr/handle/201004/43306
ISSN
02532964
Appears in Collections:
KIST Publication > Article
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