Abstract
Cu-based catalysts efficiently catalyze the electrochemical conversion of CO2 into high-value multicarbon (C2+) products. However, it remains a challenge to achieve optimal structural stability, product selectivity, and long-term catalytic durability. In this study, a well-active oxide-derived Cu surface consisting predominantly of Cu2O(111) facets is developed, which contains trace amounts of iodine (I). The Cu2O(111) surface enhances the hydrogenation of *CO and facilitates the asymmetric coupling of *CO and *CHO, while the intercalated iodine boosts the adsorption of CO2 and CO. During the reaction, the release of excess I increases the surface roughness, while the remaining iodine controls the chemical state of the surface Cu. These effects together lead to a Faradaic efficiency of 79.0% and a cathodic energy efficiency of 43.5% for C2+ products at a current density of 300 mA cm−2. Moreover, it is found that periodic electrode treatment with iodide prevents the agglomeration of catalysts and preserves sufficient active iodine sites, ensuring improved catalytic stability for C2+ production. This study provides new insights into the synergistic interactions between Cu─O compounds and iodine and offers a promising route for the development of highly active and durable catalytic systems for long-term CO2 electroreduction.
Original language | English |
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Journal | Advanced Functional Materials |
DOIs | |
Publication status | Accepted/In press - 2025 |
Keywords
- asymmetric C─C coupling
- CO electroreduction
- cuprous oxide
- iodine modified
- oxide-derived copper
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Chemistry
- Biomaterials
- General Materials Science
- Condensed Matter Physics
- Electrochemistry