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Title

Proton-conducting membranes based on poly(2,5-benzimidazole) (ABPBI) and phosphoric acid prepared by direct acid casting

AuthorsAsensio, Juan Antonio; Borrós, Salvador; Gómez-Romero, P. CSIC ORCID
KeywordsABPBI
PBI
Polybenzimidazoles
Fuel cell
Polymer electrolyte
Phosphoric acid
Conductivity
Issue Date7-Jul-2004
PublisherElsevier
CitationJournal of Membrane Science 241(1): 189–93 (2004)
AbstractWe report the preparation of phosphoric acid doped poly(2,5-benzimidazole) (ABPBI) membranes for PEMFC by simultaneously doping and casting from a poly(2,5-benzimidazole)/phosphoric acid/methanesulfonic acid (MSA) solution. The evaporation of MSA yields a very homogeneous membrane having a better controlled composition, avoiding the use of solvent-intensive procedures. Membranes have been prepared with contents of up to 3.0H3PO4 molecules per ABPBI repeating unit. These membranes achieve a maximum conductivity of 1.5 ~ 10.2 S cm.1 at temperatures as high as 180 .C in dry conditions. These ABPBI membranes are more conveniently prepared than those conventionally formed and doped in separate steps while featuring comparable conductivities (ABPBI ~ 2.7H3PO4 prepared by the soaking method showed a conductivity of 2.5 ~ 10.2 S cm.1 at 180 .C in dry conditions).
Publisher version (URL)http://dx.doi.org/10.1016/j.memsci.2004.03.044
URIhttp://hdl.handle.net/10261/15016
DOI10.1016/j.memsci.2004.03.044
ISSN0376-7388
Appears in Collections:(ICMAB) Artículos

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