An acid doped ice membrane for selective proton transport

DOI

Cation exchange membranes need to have high permselectivity for protons to make these membranes suitable for e.g. 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 M-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 was 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.

Date Submitted: 2021-04-08

Identifier
DOI https://doi.org/10.17026/dans-xcf-zd8n
Metadata Access https://phys-techsciences.datastations.nl/oai?verb=GetRecord&metadataPrefix=oai_datacite&identifier=doi:10.17026/dans-xcf-zd8n
Provenance
Creator TOM Sleutels ORCID logo
Publisher DANS Data Station Phys-Tech Sciences
Contributor T Sleutels
Publication Year 2021
Rights CC BY 4.0; info:eu-repo/semantics/openAccess; http://creativecommons.org/licenses/by/4.0
OpenAccess true
Contact T Sleutels (wetsus)
Representation
Resource Type Dataset
Format application/zip; application/vnd.oasis.opendocument.spreadsheet; application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Size 15435; 136675; 132985
Version 1.0
Discipline Other