Oxide‐derived Silver Nanowires for CO2 Electrocatalytic Reduction to CO

Silver electrocatalysts offer the possibility to produce CO by converting CO2, enabling the use of a greenhouse gas as chemical building block. Compared to nanoparticles, silver nanowires show an enhanced selectivity towards CO. Recent publications proved that oxide‐derived electrocatalysts can exhi...

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Bibliographic Details
Published in:ChemCatChem 2023-11, Vol.15 (22), p.n/a
Main Authors: Mattarozzi, Francesco, Willige, Nolan, Gulino, Valerio, Keijzer, Claudia, Poll, Rim C. J., Hensen, Emiel J. M., Ngene, Peter, Jongh, Petra E.
Format: Article
Language:English
Subjects:
Carbon dioxide
charge transfer resistance
Chemical reduction
CO production
CO2 reduction
Electrocatalysts
Electrochemical oxidation
Greenhouse gases
Nanoparticles
Nanowires
Oxidation
oxide-derived metal
Selectivity
Silver
silver nanowires
Surface roughness
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Summary:Silver electrocatalysts offer the possibility to produce CO by converting CO2, enabling the use of a greenhouse gas as chemical building block. Compared to nanoparticles, silver nanowires show an enhanced selectivity towards CO. Recent publications proved that oxide‐derived electrocatalysts can exhibit better catalytic performance than the pristine metal phase, but oxide‐derived silver nanowires have not been investigated. In this work, we report for the first time the electrocatalytic properties of silver nanowires, synthesized via the polyol method, and pretreated by electrochemical oxidation in basic electrolyte. By increasing the oxidation potential, both the percentage of AgxO and the surface roughness of the catalyst were progressively increased. The most oxidized sample showed a remarkably improved CO selectivity (−294.2 mA m−2Ag), producing a 3.3‐fold larger CO partial current density than the pristine sample (−89.4 mA m−2Ag), normalized by electrochemically active silver surface area. This work demonstrates the beneficial effect of the controlled oxidation treatment even on highly selective nanostructures such as silver nanowires. The SEM images show the change in morphology of silver nanowires after the electrochemical oxidation in NaOH. The oxidation treatment resulted in an enhanced CO partial current density compared to the pristine nanowires.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202300792