Structure Sensitivity in the Electrocatalytic Reduction of CO 2 with Gold Catalysts
| Autor: | Stefano Mezzavilla, Sebastian Horch, Brian Seger, Ifan E. L. Stephens, Ib Chorkendorff |
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| Rok vydání: | 2019 |
| Předmět: |
Intrinsic activity
010405 organic chemistry Chemistry Poisoning General Chemistry Aqueous electrolyte 010402 general chemistry Electrocatalyst Electrochemistry 01 natural sciences Combinatorial chemistry Catalysis 0104 chemical sciences Reduction (complexity) Chemical kinetics CO2 electrolysis Single crystals Gold Single crystal Structure-sensitivity |
| Zdroj: | Mezzavilla, S, Horch, S, Stephens, I, Seger, B & Chorkendorff, I 2019, ' Structure Sensitivity in the Electrocatalytic Reduction of CO 2 with Gold Catalysts ', Angewandte Chemie International Edition, vol. 28, no. 12, pp. 3774-3778 . https://doi.org/10.1002/anie.201811422 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | The understanding of how structural surface features influence electrocatalytic reactions is vital for the development of efficient nanostructured catalysts. Gold is the most active and selective known electrocatalyst for the reduction of CO2 to CO in aqueous electrolytes. Numerous strategies have been proposed to improve its intrinsic activity. Nonetheless, the atomistic knowledge of the nature of the active sites remains elusive. In this work, we systematically investigated the structure sensitivity for the electrocatalytic CO2 reduction with Au single crystals. Reaction kinetics for the formation of CO were strongly dependent on the surface structure: under-coordinated sites, such as the ones present in Au(110) and at the steps of Au(211), show at least 20-fold higher activity than more coordinated configurations (e.g. Au(100)). By selectively poisoning under-coordinated sites with Pb, we confirmed that these are the active sites for CO2 reduction. |
| Databáze: | OpenAIRE |
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