Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 12, Pages 3774-3778Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811422
Keywords
carbon dioxide; electrochemistry; gold single crystals; selective poisoning; structure sensitivity
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Funding
- European Union [705230]
- VILLUM Center for Science of Sustainable Fuels and Chemicals - VILLUM Fonden research grant [9455]
- Marie Curie Actions (MSCA) [705230] Funding Source: Marie Curie Actions (MSCA)
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An understanding of the influence of structural surface features on 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. We systematically investigated the structure sensitivity of Au single crystals for electrocatalytic CO CO(2 )reduction. Reaction kinetics for the formation of CO are strongly dependent on the surface structure. Under-coordinated sites, such as those present in Au(110) and at the steps of Au(211), show at least 20-fold higher activity than more coordinated configurations (for example, Au(100)). By selectively poisoning under-coordinated sites with Ph, we have confirmed that these are the active sites for CO2 reduction.
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