Exploring backbone-cation alkyl spacers for multi-cation side chain anion exchange membranes

Liang Zhu, Xuedi Yu, Michael Anthony Hickner

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In order to systematically study how the arrangement of cations on the side chain and length of alkyl spacers between cations impact the performance of multi-cation AEMs for alkaline fuel cells, a series of polyphenylene oxide (PPO)-based AEMs with different cationic side chains were synthesized. This work resulted in samples with two or three cations in a side chain pendant to the PPO backbone. More importantly, the length of the spacer between cations varied from 3 methylene (-CH2-) (C3) groups to 8 methylene (C8) groups. The highest conductivity, up to 99 mS/cm in liquid water at room temperature, was observed for the triple-cation side chain AEM with pentyl (C5) or hexyl (C6) spacers. The multi-cation AEMs were found to have decreased water uptake and ionic conductivity when the spacer chains between cations were lengthened from pentyl (C5) or hexyl (C6) to octyl (C8) linking groups. The triple-cation membranes with pentyl (C5) or hexyl (C6) groups between cations showed greatest stability after immersion in 1 M NaOH at 80 °C for 500 h.

Original languageEnglish (US)
Pages (from-to)433-441
Number of pages9
JournalJournal of Power Sources
Volume375
DOIs
StatePublished - Jan 31 2018

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spacers
Anions
Cations
Ion exchange
Negative ions
Positive ions
anions
membranes
Membranes
cations
Polyphenylene oxides
methylene
Alkaline fuel cells
conductivity
oxides
Water
Ionic conductivity
water
submerging
ion currents

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "In order to systematically study how the arrangement of cations on the side chain and length of alkyl spacers between cations impact the performance of multi-cation AEMs for alkaline fuel cells, a series of polyphenylene oxide (PPO)-based AEMs with different cationic side chains were synthesized. This work resulted in samples with two or three cations in a side chain pendant to the PPO backbone. More importantly, the length of the spacer between cations varied from 3 methylene (-CH2-) (C3) groups to 8 methylene (C8) groups. The highest conductivity, up to 99 mS/cm in liquid water at room temperature, was observed for the triple-cation side chain AEM with pentyl (C5) or hexyl (C6) spacers. The multi-cation AEMs were found to have decreased water uptake and ionic conductivity when the spacer chains between cations were lengthened from pentyl (C5) or hexyl (C6) to octyl (C8) linking groups. The triple-cation membranes with pentyl (C5) or hexyl (C6) groups between cations showed greatest stability after immersion in 1 M NaOH at 80 °C for 500 h.",
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Exploring backbone-cation alkyl spacers for multi-cation side chain anion exchange membranes. / Zhu, Liang; Yu, Xuedi; Hickner, Michael Anthony.

In: Journal of Power Sources, Vol. 375, 31.01.2018, p. 433-441.

Research output: Contribution to journalArticle

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