Morphology effect on proton dynamics in Nafion® 117 and sulfonated polyether ether ketone

Jun Xing Leong, Wilson Agerico Diño, Azizan Ahmad, Wan Ramli Wan Daud, Hideaki Kasai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report results of our experimental and theoretical studies on the dynamics of proton conductivity in Nafion® 117 and self-fabricated sulfonated polyether ether ketone (SPEEK) membranes. Knowing that the presence of water molecules in the diffusion process results in a lower energy barrier, we determined the diffusion barriers and corresponding tunneling probabilities of Nafion® 117 and SPEEK system using a simple theoretical model that excludes the medium (water molecules) in the initial calculations. We then propose an equation that relates the membrane conductivity to the tunneling probability. We recover the effect of the medium by introducing a correction term into the proposed equation, which takes into account the effect of the proton diffusion distance and the hydration level. We have also experimentally verified that the proposed equation correctly explain the difference in conductivity between Nafion® 117 and SPEEK. We found that membranes that are to be operated in low hydration environments (high temperatures) need to be designed with short diffusion distances to enhance and maintain high conductivity.

Original languageEnglish
Article number094803
JournalJournal of the Physical Society of Japan
Volume85
Issue number9
DOIs
Publication statusPublished - 15 Sep 2016

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ketones
ethers
conductivity
protons
membranes
hydration
high temperature environments
water
molecules
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Morphology effect on proton dynamics in Nafion® 117 and sulfonated polyether ether ketone. / Leong, Jun Xing; Diño, Wilson Agerico; Ahmad, Azizan; Wan Daud, Wan Ramli; Kasai, Hideaki.

In: Journal of the Physical Society of Japan, Vol. 85, No. 9, 094803, 15.09.2016.

Research output: Contribution to journalArticle

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