Polybenzimidazolium hydroxides - Structure, stability and degradation

Dirk Henkensmeier; Hyeong Rae Cho; Hyoung Juhn Kim; Carolina Nunes Kirchner; Janine Leppin; Alexander Dyck; Jong Hyun Jang; Eunae Cho; Suk Woo Nam; Tae Hoon Lim

doi:10.1016/j.polymdegradstab.2011.12.024

Polybenzimidazolium hydroxides - Structure, stability and degradation

Dirk Henkensmeier, Hyeong Rae Cho, Hyoung Juhn Kim, Carolina Nunes Kirchner, Janine Leppin, Alexander Dyck, Jong Hyun Jang, Eunae Cho, Suk Woo Nam, Tae Hoon Lim

GREEN SCHOOL (Graduate School of Energy and Environment)

Research output: Contribution to journal › Article › peer-review

92 Citations (Scopus)

Abstract

Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amine-amide. Further hydrolysis necessitates excess hydroxide.

Original language	English
Pages (from-to)	264-272
Number of pages	9
Journal	Polymer Degradation and Stability
Volume	97
Issue number	3
DOIs	https://doi.org/10.1016/j.polymdegradstab.2011.12.024
Publication status	Published - 2012 Mar

Keywords

2-Phenyl-imidazolium hydroxide
Anion exchange membrane
Hydrolysis
NMR
Polybenzimidazole
Polymer electrolyte

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymdegradstab.2011.12.024

Cite this

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title = "Polybenzimidazolium hydroxides - Structure, stability and degradation",

abstract = "Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amine-amide. Further hydrolysis necessitates excess hydroxide.",

keywords = "2-Phenyl-imidazolium hydroxide, Anion exchange membrane, Hydrolysis, NMR, Polybenzimidazole, Polymer electrolyte",

author = "Dirk Henkensmeier and Cho, {Hyeong Rae} and Kim, {Hyoung Juhn} and {Nunes Kirchner}, Carolina and Janine Leppin and Alexander Dyck and Jang, {Jong Hyun} and Eunae Cho and Nam, {Suk Woo} and Lim, {Tae Hoon}",

note = "Funding Information: The authors would like to thank GOI and “E-Bank” program of Korea Institute of Science and technology. Also, this work was supported by a Grant ( M2009010025 ) from the fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy (MKE), Republic of Korea . ",

year = "2012",

month = mar,

doi = "10.1016/j.polymdegradstab.2011.12.024",

language = "English",

volume = "97",

pages = "264--272",

journal = "Polymer Degradation and Stability",

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TY - JOUR

T1 - Polybenzimidazolium hydroxides - Structure, stability and degradation

AU - Henkensmeier, Dirk

AU - Cho, Hyeong Rae

AU - Kim, Hyoung Juhn

AU - Nunes Kirchner, Carolina

AU - Leppin, Janine

AU - Dyck, Alexander

AU - Jang, Jong Hyun

AU - Cho, Eunae

AU - Nam, Suk Woo

AU - Lim, Tae Hoon

N1 - Funding Information: The authors would like to thank GOI and “E-Bank” program of Korea Institute of Science and technology. Also, this work was supported by a Grant ( M2009010025 ) from the fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy (MKE), Republic of Korea .

PY - 2012/3

Y1 - 2012/3

N2 - Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amine-amide. Further hydrolysis necessitates excess hydroxide.

AB - Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amine-amide. Further hydrolysis necessitates excess hydroxide.

KW - 2-Phenyl-imidazolium hydroxide

KW - Anion exchange membrane

KW - Hydrolysis

KW - NMR

KW - Polybenzimidazole

KW - Polymer electrolyte

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U2 - 10.1016/j.polymdegradstab.2011.12.024

DO - 10.1016/j.polymdegradstab.2011.12.024

M3 - Article

AN - SCOPUS:84862790273

SN - 0141-3910

VL - 97

SP - 264

EP - 272

JO - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

IS - 3

ER -

Polybenzimidazolium hydroxides - Structure, stability and degradation

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Keywords

ASJC Scopus subject areas

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