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Journal articles
Measurement and adjustment of proton activity in solid polymer electrolytes
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.
Cited literature [19 references]
https://hal-ifp.archives-ouvertes.fr/hal-01701111
Contributor : Françoise Bertrand <>
Submitted on : Tuesday, February 6, 2018 - 8:49:03 AM
Last modification on : Wednesday, April 29, 2020 - 6:24:02 PM
Long-term archiving on: : Friday, May 4, 2018 - 12:15:20 AM
Contributor : Françoise Bertrand <>
Submitted on : Tuesday, February 6, 2018 - 8:49:03 AM
Last modification on : Wednesday, April 29, 2020 - 6:24:02 PM
Long-term archiving on: : Friday, May 4, 2018 - 12:15:20 AM
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Pasquier 2017.pdf
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