Measurement and adjustment of proton activity in solid polymer electrolytes

Edward Brightman, David Pasquier

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
13 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalElectrochemistry Communications
Early online date4 Aug 2017
Publication statusPublished - 1 Sep 2017


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


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