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Ampere-level CO2 electroreduction with single-pass conversion exceeding 85% in acid over silver penetration electrodes.
- Source :
- Nature Communications; 7/19/2024, Vol. 14 Issue 1, p1-13, 13p
- Publication Year :
- 2024
-
Abstract
- Synthesis of valuable chemicals from CO<subscript>2</subscript> electroreduction in acidic media is highly desirable to overcome carbonation. However, suppressing the hydrogen evolution reaction in such proton-rich environments remains a considerable challenge. The current study demonstrates the use of a hollow fiber silver penetration electrode with hierarchical micro/nanostructures to enable CO<subscript>2</subscript> reduction to CO in strong acids via balanced coordination of CO<subscript>2</subscript> and K<superscript>+</superscript>/H<superscript>+</superscript> supplies. Correspondingly, a CO faradaic efficiency of 95% is achieved at a partial current density as high as 4.3 A/cm<superscript>2</superscript> in a pH = 1 solution of H<subscript>2</subscript>SO<subscript>4</subscript> and KCl, sustaining 200 h of continuous electrolysis at a current density of 2 A/cm<superscript>2</superscript> with over 85% single-pass conversion of CO<subscript>2</subscript>. The experimental results and density functional theory calculations suggest that the controllable CO<subscript>2</subscript> feeding induced by the hollow fiber penetration configuration primarily coordinate the CO<subscript>2</subscript>/H<superscript>+</superscript> balance on Ag active sites in strong acids, favoring CO<subscript>2</subscript> activation and key intermediate *COOH formation, resulting in enhanced CO formation. Suppression of the competing H<subscript>2</subscript> evolution reaction in CO<subscript>2</subscript> electroreduction in strong acids remains a considerable challenge. Here, authors report a silver-based electrode that enables CO<subscript>2</subscript> conversion to CO exceeding 85% at ampere-level current densities in pH = 1 electrolytes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 178529782
- Full Text :
- https://doi.org/10.1038/s41467-024-50521-8