Measurement and adjustment of proton activity in solid polymer electrolytes

Edward Brightman, David Pasquier

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Technological progress in electrochemical energy conversion devices requires new solid polymer electrolyte membrane (PEM) materials with particular properties. The strongly acidic nature of Nafion® is not always desirable; for instance, CO2 electroreduction requires a low proton activity to avoid excess hydrogen evolution. This communication presents a novel measurement technique for determining the acidity of a PEM, using a pH-sensitive electrode half-cell attached to the membrane sample, connected to a reference electrode via a salt bridge. A dynamic hydrogen electrode on platinized‑platinum surface (DHE) was found to give repeatable results within 5% uncertainty. Several membranes based on Nafion® impregnated with various basic species were tested, as well as an anion-exchange membrane and a poly-phosphonic acid membrane. The technique is expected to have wider reaching applications in PEM fuel cell and redox flow battery development, as well as in the electrolysis and electrodialysis industries.

LanguageEnglish
Pages145-149
Number of pages5
JournalElectrochemistry Communications
Volume82
Early online date4 Aug 2017
DOIs
Publication statusPublished - 1 Sep 2017

Fingerprint

Electrolytes
Protons
Polymers
Membranes
Electrodes
Hydrogen
Electrodialysis
Proton exchange membrane fuel cells (PEMFC)
Platinum
Energy conversion
Electrolysis
Acidity
Anions
Ion exchange
Negative ions
Salts
Acids
Communication
Industry
perfluorosulfonic acid

Keywords

  • Ionomers
  • pH
  • Polymer electrolyte membrane
  • Proton activity
  • Reference electrode

Cite this

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Measurement and adjustment of proton activity in solid polymer electrolytes. / Brightman, Edward; Pasquier, David.

In: Electrochemistry Communications, Vol. 82, 01.09.2017, p. 145-149.

Research output: Contribution to journalArticle

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