Reversible/irreversible increase in proton-conductive areas on proton-exchange-membrane surface by applying voltage using current-sensing atomic force microscope

Masanori Hara, Hattori Daiki, Junji Inukai, Masaya Hara, Kenji Miyatake, Masahiro Watanabe

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

By using a current-sensing atomic force microscope (CS-AFM) under a hydrogen atmosphere, microscopic proton-conductive areas on the membrane surface of sulfonated poly(arylene ether sulfone ketone) block copolymer were investigated. With increasing the bias voltage during the CS-AFM scans, the number and the diameter of proton-conductive spots on the membrane surface continuously increased. Both reversible/irreversible changes in the proton-conductive area on the surface were found. The reversible change indicates that the proton-conductive paths are dynamically rearranged during the power generation in a polymer electrolyte fuel cell. The irreversible change might be related to the enhancement of the performance of the membrane electrode assemblies after being "conditioned" prior to the operation.

Original languageEnglish
Pages (from-to)158-163
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume716
DOIs
Publication statusPublished - 2014 Mar 1
Externally publishedYes

Keywords

  • Conditioning
  • Current-sensing atomic force microscope
  • Proton exchange membrane
  • Proton-conductive path

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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