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Author |
Papamichail, D.; Franceschini, F.; Abbas, I.; Balalta, D.; Nguyen, T.T.H.; Pant, D.; Bals, S.; Taurino, I.; Janssens, E.; Grandjean, D.; Lievens, P. |
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Title |
Nanostructuring copper thin film electrodes for CO₂ electroreduction to C₂+ products |
Type |
A1 Journal article |
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Year  |
2025 |
Publication |
Nanoscale |
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Volume |
17 |
Issue |
30 |
Pages |
17745-17757 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
The electrochemical CO2 reduction reaction (CO2RR) is a promising approach for achieving carbon-neutral processes in the chemical industry. In this context, various nanostructures have been reported to enhance the C2+ selectivity of Cu-based catalysts. Here, we prepared Cu nanoneedles (NN) from 300 nm sputtered Cu thin films through anodization under various conditions and investigated their performance in terms of C2+ product selectivity. Various combinations of anodization potentials (+0.75 VRHE, +0.85 VRHE, and +0.95 VRHE) and KOH electrolyte concentrations (0.1 M, 0.5 M and 1.0 M) allow the tailoring of the NN length and density that are linked to their CO2RR product selectivity at -1.0 VRHE. The best performance using the C2+ : C1 ratio was achieved with a high NN surface density. A detailed analysis using high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy of the best performing sample shows that the anodization of a Cu thin film produces NNs composed of a uniform 3D network of 2 nm hydroxide nanoparticles (NPs) and reconstructs into a rougher metallic Cu NP network after the CO2RR. A high density of NNs with this inner structure may lead to an increase in the local CO concentration and thus to C2+ products. This systematic work demonstrates that nanostructuring the surface of copper thin film electrodes can enhance the CO2RR selectivity to C2+ products while the correlation between the NN morphology and their inner structure strengthens further their applications as CO2 electrocatalysts. |
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Wos |
WOS:001529500000001 |
Publication Date |
2025-07-02 |
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ISSN |
2040-3364; 2040-3372 |
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Additional Links |
UA library record; WoS full record |
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Open Access |
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no |
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Call Number |
UA @ admin @ c:irua:216054 |
Serial |
9451 |
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