Cited by 544CO2 Reduction Techniques and CatalystsElectrocatalysts for Energy ConversionCatalysts for Methane Reforming

Product Selectivity Affected by Cationic Species in Electrochemical Reduction of CO2 and CO at a Cu Electrode

Murata, Akira, Hori, Yoshio·1991·Bulletin of the Chemical Society of Japan

Abstract

Electroreduction of CO2 and CO was studied with a copper electrode in hydrogencarbonate solutions of various cations. Product selectivity was greatly affected by cationic species as well as HCO3− concentration. H2 evolution prevailed over CO2 reduction in Li+ electrolyte, whereas CO2 reduction was favorable in Na+, K+, and Cs+ solutions. C2H4 formation became greater than CH4 with increase of the cation size, i.e. with sequence of Li+, Na+, K+, Cs+. The variation of the product selectivity caused by cationic species is rationalized by the difference of outer Helmholtz plane (OHP) potential. The OHP potential will vary with cationic species in accordance with the degree of specific adsorption. The concentration of H+ at the electrode will depend upon the OHP potential, since H+ is a charged species. This difference of pH at the electrode will lead to the variation of product selectivity.

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Crossref · 10.1246/bcsj.64.123

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8 of 8 references verified0 citation errors · 0 not checkable

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  • Ohmic losses may be prohibitively large in the case of less conductive electrolytes, such as 0.1 M KHCO3 (conductivity of 10 mS/cm compared to 1.0 M KOH which has a conductivity of 220 mS/cm), where the energy efficiency would be greatly impacted.

    “Ohmic losses may be prohibitively large in the case of less conductive electrolytes, such as 0.1 M KHCO3 (conductivity of 10 mS/cm as compared to 1.0 M KOH which has a conductivity of 220 mS/cm), [218,219] where the energy efficiency would be greatly impacted”

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Authors
Murata, A., & Hori, Y.
Affiliations
Chiba University (JP)
Venue
Bulletin of the Chemical Society of Japan
Published
1991-01-01
Volume
64
Issue
1
Pages
123-127
ISSN
  • 0009-2673 (ISSN-L)
  • 1348-0634
OpenAlex
W2082259857
Cited by
544
References
8
Citations by year
2026: 40 · 2025: 65 · 2024: 76 · 2023: 60 · 2022: 45 · 2021: 60 · 2020: 38 · 2019: 45 · 2018: 30 · 2017: 24 · 2016: 15 · 2015: 10 · 2014: 5 · 2013: 7 · 2012: 2
FWCI
2.64
Type
journal article
Language
en
Open access
closed
Locations
Bulletin of the Chemical Society of Japan (publishedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
Keywords
electrochemical CO2 reduction, CO electroreduction, copper electrode, product selectivity, cation effects, specific adsorption, hydrogen evolution reaction, ethylene production, methane production, cation size, lithium, sodium, potassium, cesium

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