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Extrinsic hydrophobicity-controlled silver nanoparticles as efficient and stable catalysts for CO2 electrolysis.
- Source :
- Nature Communications; 4/18/2024, Vol. 15 Issue 1, p1-11, 11p
- Publication Year :
- 2024
-
Abstract
- To realize economically feasible electrochemical CO<subscript>2</subscript> conversion, achieving a high partial current density for value-added products is particularly vital. However, acceleration of the hydrogen evolution reaction due to cathode flooding in a high-current-density region makes this challenging. Herein, we find that partially ligand-derived Ag nanoparticles (Ag-NPs) could prevent electrolyte flooding while maintaining catalytic activity for CO<subscript>2</subscript> electroreduction. This results in a high Faradaic efficiency for CO (>90%) and high partial current density (298.39 mA cm<superscript>‒2</superscript>), even under harsh stability test conditions (3.4 V). The suppressed splitting/detachment of Ag particles, due to the lipid ligand, enhance the uniform hydrophobicity retention of the Ag-NP electrode at high cathodic overpotentials and prevent flooding and current fluctuations. The mass transfer of gaseous CO<subscript>2</subscript> is maintained in the catalytic region of several hundred nanometers, with the smooth formation of a triple phase boundary, which facilitate the occurrence of CO<subscript>2</subscript>RR instead of HER. We analyze catalyst degradation and cathode flooding during CO<subscript>2</subscript> electrolysis through identical-location transmission electron microscopy and operando synchrotron-based X-ray computed tomography. This study develops an efficient strategy for designing active and durable electrocatalysts for CO<subscript>2</subscript> electrolysis. A key factor for the electrochemical reduction of CO<subscript>2</subscript> to CO is limiting the competing H<subscript>2</subscript> evolution reaction. Here, authors use real-time synchrotron X-ray computed tomography to show that a silver nanoparticle-ligand catalyst structure improves water management, thereby maintaining CO production. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 15
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 176726985
- Full Text :
- https://doi.org/10.1038/s41467-024-47490-3