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Carbonate ion crossover in zero-gap, KOH anolyte CO₂ electrolysis

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1021/acs.jpcc.1c08430
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-0088-2109; Search for: ORCID identifier: https://orcid.org/0000-0002-9348-0503; Search for: ORCID identifier: https://orcid.org/0000-0002-5140-2443; Search for: 1ORCID identifier: https://orcid.org/0000-0002-7929-945X; Search for: 1ORCID identifier: https://orcid.org/0000-0002-1653-1047
Affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
FunderSearch for: National Research Council of Canada
FormatText, Article
Subjectelectrical properties; electrochemical cells; electrodes; inorganic carbon compounds; ions
Abstract
A room-temperature zero-gap, KOH anolyte CO₂ electrolyzer demonstrating 40% energetic conversion efficiency (EE) for CO₂ to CO using AEMION anion-exchange membranes is achieved at an industrially relevant current density of 200 mA cm⁻². The concentration and volume of the anolyte are found to be critical to the determination of EE as carbonate ion crossover is shown to cause a significant increase in ECell during continuous operation. Using thicker and/or lower ion-exchange capacity variant membranes results in an approximately 20% reduction in carbonate ion crossover, which is critical for the economic viability of direct CO₂ electrolysis systems. It is proposed that future membrane designs must reduce carbonate crossover without compromising the electrolyzer efficiency and stability.
Publication date
PublisherAmerican Chemical Society
In
  • The Journal of Physical Chemistry C 125, no. 46 (15 November 2021): 25446–25454.
LanguageEnglish
Peer reviewedYes
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Record identifierbf02bb31-50e9-4047-a5ef-62bd80a934bc
Record created2023-01-04
Record modified2023-03-16
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