Enhanced Carbon Dioxide Electroreduction To Carbon Monoxide Over Defect-Rich Plasma-Activated Silver Catalysts

Keywords

CO reduction 2; electrocatalysis; nanostructures; silver

Abstract

Efficient, stable catalysts with high selectivity for a single product are essential if electroreduction of CO2 is to become a viable route to the synthesis of industrial feedstocks and fuels. A plasma oxidation pre-treatment of silver foil enhances the number of low-coordinated catalytically active sites, which dramatically lowers the overpotential and increases the activity of CO2 electroreduction to CO. At −0.6 V versus RHE more than 90 % Faradaic efficiency towards CO was achieved on a pre-oxidized silver foil. While transmission electron microscopy (TEM) and operando X-ray absorption spectroscopy showed that oxygen species can survive in the bulk of the catalyst during the reaction, quasi in situ X-ray photoelectron spectroscopy showed that the surface is metallic under reaction conditions. DFT calculations reveal that the defect-rich surface of the plasma-oxidized silver foils in the presence of local electric fields drastically decrease the overpotential of CO2 electroreduction.

Publication Date

9-11-2017

Publication Title

Angewandte Chemie - International Edition

Volume

56

Issue

38

Number of Pages

11394-11398

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/anie.201704613

Socpus ID

85028813466 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85028813466

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