Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

Anastasiia Konovalova, Hyemi Kim, Sangwon Kim, Ahyoun Lim, Hyun Seo Park, Mikkel Rykær Kraglund, David Aili, Jong Hyun Jang, Hyoung-Juhn Kim, Dirk Henkensmeier*

*Corresponding author for this work

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Abstract

Anion exchange membranes (AEMs) conduct selectively hydroxide ions, while KOH doped polybenzimidazole is an ion-solvating polymer, conducting both potassium and hydroxide ions. In this work, meta-polybenzimidazole (mPBI) was blended with FAA3, a commercially available AEM, in the ratios of 2:1, 3:1, 4:1, 5:1 and 1:0. Doping was done by immersion in 0, 10, 15, 20, 25 and 30 wt% KOH solutions, giving rise to 30 membranes which were analyzed for their swelling behavior during doping, there composition (polymer, water, KOH), their mechanical properties and their through-plane conductivity in KOH solutions. Especially PF-41 showed higher tensile strength and Young's modulus than mPBI under all tested KOH concentrations. The highest conductivity of 166 mS cm−1 was observed for PF-51 doped in 25% KOH, 80% higher than for mPBI. In an alkaline stability test, blend membranes showed higher tensile strength, Young's modulus and lower weight loss than mPBI after 4 weeks at 85 °C in 25 wt% KOH solution. PF-31 and PF-41 were also tested in an electrolysis cell, where they showed cell resistance comparable to mPBI. Because systems without cathode feed can be quite efficient, the permeability of membranes for KOH solutions was investigated.
Original languageEnglish
JournalJournal of Membrane Science
Volume564
Pages (from-to)653-662
ISSN0376-7388
DOIs
Publication statusPublished - 2018

Keywords

  • Polybenzimidazole
  • Anion exchange membranes
  • Blend polymers
  • Alkaline electrolysis
  • Alkaline stability

Cite this

Konovalova, Anastasiia ; Kim, Hyemi ; Kim, Sangwon ; Lim, Ahyoun ; Park, Hyun Seo ; Kraglund, Mikkel Rykær ; Aili, David ; Jang, Jong Hyun ; Kim, Hyoung-Juhn ; Henkensmeier, Dirk. / Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity. In: Journal of Membrane Science. 2018 ; Vol. 564. pp. 653-662.
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title = "Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity",
abstract = "Anion exchange membranes (AEMs) conduct selectively hydroxide ions, while KOH doped polybenzimidazole is an ion-solvating polymer, conducting both potassium and hydroxide ions. In this work, meta-polybenzimidazole (mPBI) was blended with FAA3, a commercially available AEM, in the ratios of 2:1, 3:1, 4:1, 5:1 and 1:0. Doping was done by immersion in 0, 10, 15, 20, 25 and 30 wt{\%} KOH solutions, giving rise to 30 membranes which were analyzed for their swelling behavior during doping, there composition (polymer, water, KOH), their mechanical properties and their through-plane conductivity in KOH solutions. Especially PF-41 showed higher tensile strength and Young's modulus than mPBI under all tested KOH concentrations. The highest conductivity of 166 mS cm−1 was observed for PF-51 doped in 25{\%} KOH, 80{\%} higher than for mPBI. In an alkaline stability test, blend membranes showed higher tensile strength, Young's modulus and lower weight loss than mPBI after 4 weeks at 85 °C in 25 wt{\%} KOH solution. PF-31 and PF-41 were also tested in an electrolysis cell, where they showed cell resistance comparable to mPBI. Because systems without cathode feed can be quite efficient, the permeability of membranes for KOH solutions was investigated.",
keywords = "Polybenzimidazole, Anion exchange membranes, Blend polymers, Alkaline electrolysis, Alkaline stability",
author = "Anastasiia Konovalova and Hyemi Kim and Sangwon Kim and Ahyoun Lim and Park, {Hyun Seo} and Kraglund, {Mikkel Ryk{\ae}r} and David Aili and Jang, {Jong Hyun} and Hyoung-Juhn Kim and Dirk Henkensmeier",
year = "2018",
doi = "10.1016/j.memsci.2018.07.074",
language = "English",
volume = "564",
pages = "653--662",
journal = "Journal of Membrane Science",
issn = "0376-7388",
publisher = "Elsevier",

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Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity. / Konovalova, Anastasiia; Kim, Hyemi; Kim, Sangwon; Lim, Ahyoun; Park, Hyun Seo; Kraglund, Mikkel Rykær; Aili, David; Jang, Jong Hyun; Kim, Hyoung-Juhn; Henkensmeier, Dirk.

In: Journal of Membrane Science, Vol. 564, 2018, p. 653-662.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

AU - Konovalova, Anastasiia

AU - Kim, Hyemi

AU - Kim, Sangwon

AU - Lim, Ahyoun

AU - Park, Hyun Seo

AU - Kraglund, Mikkel Rykær

AU - Aili, David

AU - Jang, Jong Hyun

AU - Kim, Hyoung-Juhn

AU - Henkensmeier, Dirk

PY - 2018

Y1 - 2018

N2 - Anion exchange membranes (AEMs) conduct selectively hydroxide ions, while KOH doped polybenzimidazole is an ion-solvating polymer, conducting both potassium and hydroxide ions. In this work, meta-polybenzimidazole (mPBI) was blended with FAA3, a commercially available AEM, in the ratios of 2:1, 3:1, 4:1, 5:1 and 1:0. Doping was done by immersion in 0, 10, 15, 20, 25 and 30 wt% KOH solutions, giving rise to 30 membranes which were analyzed for their swelling behavior during doping, there composition (polymer, water, KOH), their mechanical properties and their through-plane conductivity in KOH solutions. Especially PF-41 showed higher tensile strength and Young's modulus than mPBI under all tested KOH concentrations. The highest conductivity of 166 mS cm−1 was observed for PF-51 doped in 25% KOH, 80% higher than for mPBI. In an alkaline stability test, blend membranes showed higher tensile strength, Young's modulus and lower weight loss than mPBI after 4 weeks at 85 °C in 25 wt% KOH solution. PF-31 and PF-41 were also tested in an electrolysis cell, where they showed cell resistance comparable to mPBI. Because systems without cathode feed can be quite efficient, the permeability of membranes for KOH solutions was investigated.

AB - Anion exchange membranes (AEMs) conduct selectively hydroxide ions, while KOH doped polybenzimidazole is an ion-solvating polymer, conducting both potassium and hydroxide ions. In this work, meta-polybenzimidazole (mPBI) was blended with FAA3, a commercially available AEM, in the ratios of 2:1, 3:1, 4:1, 5:1 and 1:0. Doping was done by immersion in 0, 10, 15, 20, 25 and 30 wt% KOH solutions, giving rise to 30 membranes which were analyzed for their swelling behavior during doping, there composition (polymer, water, KOH), their mechanical properties and their through-plane conductivity in KOH solutions. Especially PF-41 showed higher tensile strength and Young's modulus than mPBI under all tested KOH concentrations. The highest conductivity of 166 mS cm−1 was observed for PF-51 doped in 25% KOH, 80% higher than for mPBI. In an alkaline stability test, blend membranes showed higher tensile strength, Young's modulus and lower weight loss than mPBI after 4 weeks at 85 °C in 25 wt% KOH solution. PF-31 and PF-41 were also tested in an electrolysis cell, where they showed cell resistance comparable to mPBI. Because systems without cathode feed can be quite efficient, the permeability of membranes for KOH solutions was investigated.

KW - Polybenzimidazole

KW - Anion exchange membranes

KW - Blend polymers

KW - Alkaline electrolysis

KW - Alkaline stability

U2 - 10.1016/j.memsci.2018.07.074

DO - 10.1016/j.memsci.2018.07.074

M3 - Journal article

VL - 564

SP - 653

EP - 662

JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

ER -