Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes

David Aili; Katja  Jankova Atanasova; Junyoung Han; Niels J. Bjerrum; Jens Oluf Jensen; Qingfeng Li

doi:10.1016/j.polymer.2016.01.011

Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes

David Aili, Katja Jankova Atanasova, Junyoung Han, Niels J. Bjerrum, Jens Oluf Jensen, Qingfeng Li

Department of Energy Conversion and Storage

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Abstract

Poly(2,20-(m-phenylene)-5,50-bisbenzimidazole) (m-PBI) can dissolve large amounts of aqueous electrolytes to give materials with extraordinary high ion conductivity and the practical applicability has been demonstrated repeatedly in fuel cells, water electrolysers and as anion conducting component in fuel cell catalyst layers. This work focuses on the chemistry of m-PBI in aqueous potassium hydroxide. Equilibration in aqueous KOH with concentrations of 15e20 wt.% was found to result in ionization of the polymer, causing released intermolecular hydrogen bonding. This allowed for extensive volume swelling, high electrolyte uptake, dramatic plasticization and increase of the ion conductivity for the formed poly(potassium benzimidazolide)-based structure. Further increasing the concentration of the bulk solution to 50 wt.% resulted in dehydration and extensive crystallization of the polymer matrix as evidenced by X-ray diffraction, increased density and enhanced elastic modulus. © 2016 Elsevier Ltd. All rights reserved.

Original language	English
Journal	Polymer
Volume	84
Pages (from-to)	304-310
Number of pages	7
ISSN	0032-3861
DOIs	https://doi.org/10.1016/j.polymer.2016.01.011
Publication status	Published - 2016

Bibliographical note

This work was financially supported by the Danish Council for Independent Research, Technology and Production Science (grant number 11-117035/FTP) and DTU Energy

Keywords

Polybenzimidazole
Ionomer
Alkaline
Ion-solvation
Electrolyte

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title = "Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes",

abstract = "Poly(2,20-(m-phenylene)-5,50-bisbenzimidazole) (m-PBI) can dissolve large amounts of aqueous electrolytes to give materials with extraordinary high ion conductivity and the practical applicability has been demonstrated repeatedly in fuel cells, water electrolysers and as anion conducting component in fuel cell catalyst layers. This work focuses on the chemistry of m-PBI in aqueous potassium hydroxide. Equilibration in aqueous KOH with concentrations of 15e20 wt.% was found to result in ionization of the polymer, causing released intermolecular hydrogen bonding. This allowed for extensive volume swelling, high electrolyte uptake, dramatic plasticization and increase of the ion conductivity for the formed poly(potassium benzimidazolide)-based structure. Further increasing the concentration of the bulk solution to 50 wt.% resulted in dehydration and extensive crystallization of the polymer matrix as evidenced by X-ray diffraction, increased density and enhanced elastic modulus. {\textcopyright} 2016 Elsevier Ltd. All rights reserved.",

keywords = "Polybenzimidazole, Ionomer, Alkaline, Ion-solvation, Electrolyte",

author = "David Aili and {Jankova Atanasova}, Katja and Junyoung Han and Bjerrum, {Niels J.} and Jensen, {Jens Oluf} and Qingfeng Li",

note = "This work was financially supported by the Danish Council for Independent Research, Technology and Production Science (grant number 11-117035/FTP) and DTU Energy",

year = "2016",

doi = "10.1016/j.polymer.2016.01.011",

language = "English",

volume = "84",

pages = "304--310",

journal = "Polymer",

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TY - JOUR

T1 - Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes

AU - Aili, David

AU - Jankova Atanasova, Katja

AU - Han, Junyoung

AU - Bjerrum, Niels J.

AU - Jensen, Jens Oluf

AU - Li, Qingfeng

N1 - This work was financially supported by the Danish Council for Independent Research, Technology and Production Science (grant number 11-117035/FTP) and DTU Energy

PY - 2016

Y1 - 2016

N2 - Poly(2,20-(m-phenylene)-5,50-bisbenzimidazole) (m-PBI) can dissolve large amounts of aqueous electrolytes to give materials with extraordinary high ion conductivity and the practical applicability has been demonstrated repeatedly in fuel cells, water electrolysers and as anion conducting component in fuel cell catalyst layers. This work focuses on the chemistry of m-PBI in aqueous potassium hydroxide. Equilibration in aqueous KOH with concentrations of 15e20 wt.% was found to result in ionization of the polymer, causing released intermolecular hydrogen bonding. This allowed for extensive volume swelling, high electrolyte uptake, dramatic plasticization and increase of the ion conductivity for the formed poly(potassium benzimidazolide)-based structure. Further increasing the concentration of the bulk solution to 50 wt.% resulted in dehydration and extensive crystallization of the polymer matrix as evidenced by X-ray diffraction, increased density and enhanced elastic modulus. © 2016 Elsevier Ltd. All rights reserved.

AB - Poly(2,20-(m-phenylene)-5,50-bisbenzimidazole) (m-PBI) can dissolve large amounts of aqueous electrolytes to give materials with extraordinary high ion conductivity and the practical applicability has been demonstrated repeatedly in fuel cells, water electrolysers and as anion conducting component in fuel cell catalyst layers. This work focuses on the chemistry of m-PBI in aqueous potassium hydroxide. Equilibration in aqueous KOH with concentrations of 15e20 wt.% was found to result in ionization of the polymer, causing released intermolecular hydrogen bonding. This allowed for extensive volume swelling, high electrolyte uptake, dramatic plasticization and increase of the ion conductivity for the formed poly(potassium benzimidazolide)-based structure. Further increasing the concentration of the bulk solution to 50 wt.% resulted in dehydration and extensive crystallization of the polymer matrix as evidenced by X-ray diffraction, increased density and enhanced elastic modulus. © 2016 Elsevier Ltd. All rights reserved.

KW - Polybenzimidazole

KW - Ionomer

KW - Alkaline

KW - Ion-solvation

KW - Electrolyte

U2 - 10.1016/j.polymer.2016.01.011

DO - 10.1016/j.polymer.2016.01.011

M3 - Journal article

SN - 0032-3861

VL - 84

SP - 304

EP - 310

JO - Polymer

JF - Polymer

ER -

Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes

Abstract

Bibliographical note

Keywords

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