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

Juan Antonio Asensio; Salvador Borrós; Pedro Gómez-Romero

doi:10.1016/j.memsci.2004.03.044

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

Juan Antonio Asensio
, Salvador Borrós
, Pedro Gómez-Romero^*

^*Corresponding author for this work

Research output: Indexed journal article › Article › peer-review

133 Citations (Scopus)

Abstract

We 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 3.0H₃PO ₄ 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).

Original language	English
Pages (from-to)	89-93
Number of pages	5
Journal	Journal of Membrane Science
Volume	241
Issue number	1
DOIs	https://doi.org/10.1016/j.memsci.2004.03.044
Publication status	Published - 15 Sept 2004

Keywords

ABPBI
Conductivity
Fuel cell
PBI
Phosphoric acid
Polybenzimidazoles
Polymer electrolyte
Proton-exchange membrane

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10.1016/j.memsci.2004.03.044

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

abstract = "We 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 3.0H3PO 4 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).",

keywords = "ABPBI, Conductivity, Fuel cell, PBI, Phosphoric acid, Polybenzimidazoles, Polymer electrolyte, Proton-exchange membrane",

author = "Asensio, \{Juan Antonio\} and Salvador Borr{\'o}s and Pedro G{\'o}mez-Romero",

note = "Funding Information: This work was carried out within the framework of the Xarxa Tem{\`a}tica de Piles de Combustible” de la Generalitat de Catalunya and the “Red de Pilas de Combustible del CSIC” and was partially funded by MCyT (Spain) (MAT2002-04529-C03). We thank the MCyT for a pre-doctoral fellowship awarded to J.A.A. ",

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AU - Asensio, Juan Antonio

AU - Borrós, Salvador

AU - Gómez-Romero, Pedro

N1 - Funding Information: This work was carried out within the framework of the Xarxa Temàtica de Piles de Combustible” de la Generalitat de Catalunya and the “Red de Pilas de Combustible del CSIC” and was partially funded by MCyT (Spain) (MAT2002-04529-C03). We thank the MCyT for a pre-doctoral fellowship awarded to J.A.A.

PY - 2004/9/15

Y1 - 2004/9/15

N2 - We 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 3.0H3PO 4 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).

AB - We 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 3.0H3PO 4 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).

KW - ABPBI

KW - Conductivity

KW - Fuel cell

KW - PBI

KW - Phosphoric acid

KW - Polybenzimidazoles

KW - Polymer electrolyte

KW - Proton-exchange membrane

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

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Keywords

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