Oxidative degradation of polybenzimidazole membranes as electrolytes for high temperature proton exchange membrane fuel cells

Publication: Research - peer-reviewConference article – Annual report year: 2011

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Oxidative degradation of polybenzimidazole membranes as electrolytes for high temperature proton exchange membrane fuel cells. / Liao, J.H.; Li, Qingfeng; Rudbeck, H.C.; Jensen, Jens Oluf; Chromik, A.; Bjerrum, Niels; Kerres, J.; Xing, W.

In: Fuel Cells, Vol. 11, No. 6, 2011, p. 745-755.

Publication: Research - peer-reviewConference article – Annual report year: 2011

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Liao, J.H.; Li, Qingfeng; Rudbeck, H.C.; Jensen, Jens Oluf; Chromik, A.; Bjerrum, Niels; Kerres, J.; Xing, W. / Oxidative degradation of polybenzimidazole membranes as electrolytes for high temperature proton exchange membrane fuel cells.

In: Fuel Cells, Vol. 11, No. 6, 2011, p. 745-755.

Publication: Research - peer-reviewConference article – Annual report year: 2011

Bibtex

@article{aea71e5b8642411a8251e72d26039e5a,
title = "Oxidative degradation of polybenzimidazole membranes as electrolytes for high temperature proton exchange membrane fuel cells",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
author = "J.H. Liao and Qingfeng Li and H.C. Rudbeck and Jensen, {Jens Oluf} and A. Chromik and Niels Bjerrum and J. Kerres and W. Xing",
year = "2011",
doi = "10.1002/fuce.201000146",
volume = "11",
number = "6",
pages = "745--755",
journal = "Fuel Cells",
issn = "1615-6846",

}

RIS

TY - CONF

T1 - Oxidative degradation of polybenzimidazole membranes as electrolytes for high temperature proton exchange membrane fuel cells

A1 - Liao,J.H.

A1 - Li,Qingfeng

A1 - Rudbeck,H.C.

A1 - Jensen,Jens Oluf

A1 - Chromik,A.

A1 - Bjerrum,Niels

A1 - Kerres,J.

A1 - Xing,W.

AU - Liao,J.H.

AU - Li,Qingfeng

AU - Rudbeck,H.C.

AU - Jensen,Jens Oluf

AU - Chromik,A.

AU - Bjerrum,Niels

AU - Kerres,J.

AU - Xing,W.

PB - Wiley - V C H Verlag GmbH & Co. KGaA

PY - 2011

Y1 - 2011

N2 - Polybenzimidazole membranes imbibed with acid are emerging as a suitable electrolyte material for high-temperature polymer electrolyte fuel cells. The oxidative stability of polybenzimidazole has been identified as an important issue for the long-term durability of such cells. In this paper the oxidative degradation of the polymer membrane was studied under the Fenton test conditions by the weight loss, intrinsic viscosity, size exclusion chromatography, scanning electron microscopy and Fourier transform infrared spectroscopy. During the Fenton test, significant weight losses depending on the initial molecular weight of the polymer were observed. At the same time, viscosity and SEC measurements revealed a steady decrease in molecular weight. The degradation of acid doped PBI membranes under Fenton test conditions is proposed to start by the attack of hydroxyl radicals at the carbon atom linking imidazole ring and benzenoid ring, which may eventually lead to the imidazole ring opening and formation of small molecules and terminal groups for further oxidation by an endpoint oxidation. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

AB - Polybenzimidazole membranes imbibed with acid are emerging as a suitable electrolyte material for high-temperature polymer electrolyte fuel cells. The oxidative stability of polybenzimidazole has been identified as an important issue for the long-term durability of such cells. In this paper the oxidative degradation of the polymer membrane was studied under the Fenton test conditions by the weight loss, intrinsic viscosity, size exclusion chromatography, scanning electron microscopy and Fourier transform infrared spectroscopy. During the Fenton test, significant weight losses depending on the initial molecular weight of the polymer were observed. At the same time, viscosity and SEC measurements revealed a steady decrease in molecular weight. The degradation of acid doped PBI membranes under Fenton test conditions is proposed to start by the attack of hydroxyl radicals at the carbon atom linking imidazole ring and benzenoid ring, which may eventually lead to the imidazole ring opening and formation of small molecules and terminal groups for further oxidation by an endpoint oxidation. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

KW - Fuel Cells

KW - Polybenzimidazole (PBI)

KW - Proton Exchange Membrane

KW - Oxidative Degradation

KW - Phosphoric Acid

U2 - 10.1002/fuce.201000146

DO - 10.1002/fuce.201000146

JO - Fuel Cells

JF - Fuel Cells

SN - 1615-6846

IS - 6

VL - 11

SP - 745

EP - 755

ER -