An acid-doped ice membrane for selective proton transport

Tom Sleutels, Iosif Kaniadakis, Olaniyi Oladimeji, Harm van der Kooij, Annemiek ter Heijne*, Michel Saakes

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Cation exchange membranes need to have high permselectivity for protons to make these membranes suitable for, for example, energy storage devices. Here, we present the proof of concept for a proton selective membrane made of hydrochloric acid-doped ice. The proton selectivity of this acid-doped ice membrane is the result of defects in the ice structure, caused by the acid. Ice membranes were made from different hydrochloric acid concentrations (0.1-2.0 M). The proton permselectivity of all ice membranes was above 99.7% when both Na+ and K+ were present. The resistivity decreased exponentially with the concentration of acid in the ice membrane, reaching a value of 12 Ω.cm. The ice membranes were tested in an electrochemical cell using the Fe/Fe2+ and Fe2+/Fe3+ redox couples, and a power density of 7 W/m2 and OCV of 0.87 V were measured. The resistance of the ice membrane increased with time as protons moved from the ice structure, as determined from the higher pH of the ice after melting. These expelled protons (and corresponding counter charged ions) were not replaced by other mobile cations, indicating a permanent loss in conductivity, but not selectivity. To apply the ice membrane as a selective separator for protons in energy storage devices in the future, the membrane thickness should be reduced and the protons should be retained inside the ice.

Original languageEnglish
JournalInternational Journal of Energy Research
DOIs
Publication statusE-pub ahead of print - 23 Dec 2020

Keywords

  • energy storage
  • ice
  • IEM
  • proton exchange membrane

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