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Access through your institution Buy or subscribe Now, Buxing Han, Xiaofu Sun and colleagues report the electrochemical coupling of CO2 and formaldehyde into ethanol using an iodine-modified
copper catalyst. A series of halogen-modified Cu catalysts, as well as Cu2O, are initially prepared — with the iodine-modified one being the most selective to ethanol — using a
two-compartment H-cell setup with a CO2-saturated 1 M KOH electrolyte with 5 mM LiI and paraformaldehyde equivalent to 3 M formaldehyde. After optimizing the iodine content, the authors find
that the highest performance is achieved at –1.12 V vs. Ag/AgCl, with a Faradaic efficiency for ethanol of 32.4% and a formation rate of 1.6 mmol g–1 h–1. The researchers also provide
extensive catalyst characterization, which reveals that the material, after being pretreated in CO2-saturated 1 M KOH electrolyte, becomes Cu2O with iodine incorporated into the lattice.
Operando X-ray emission and absorption spectroscopies evidence partial reduction of Cu during operation, but still with a slightly positive oxidation state. The work is finally complemented
with mechanistic analyses based on in situ infrared and Raman spectroscopies and density functional theory calculations. This is a preview of subscription content, access via your
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institutional subscriptions * Read our FAQs * Contact customer support AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Nature Catalysis https://www.nature.com/natcatal Marçal Capdevila-Cortada
Authors * Marçal Capdevila-Cortada View author publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Marçal Capdevila-Cortada.
RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Capdevila-Cortada, M. A toast from the couple. _Nat Catal_ 5, 842 (2022).
https://doi.org/10.1038/s41929-022-00864-6 Download citation * Published: 19 October 2022 * Issue Date: October 2022 * DOI: https://doi.org/10.1038/s41929-022-00864-6 SHARE THIS ARTICLE
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