A Surface Reconstruction Route to High Productivity and Selectivity in CO2 Electroreduction toward C2+ Hydrocarbons

Md Golam Kibria, Cao Thang Dinh, Ali Seifitokaldani, Phil De Luna, Thomas Burdyny, Rafael Quintero-Bermudez, Michael B. Ross, Oleksandr S. Bushuyev, F. Pelayo García de Arquer, More Authors

Research output: Contribution to journalArticleScientificpeer-review

86 Citations (Scopus)

Abstract

Electrochemical carbon dioxide reduction (CO2) is a promising technology to use renewable electricity to convert CO2 into valuable carbon-based products. For commercial-scale applications, however, the productivity and selectivity toward multi-carbon products must be enhanced. A facile surface reconstruction approach that enables tuning of CO2-reduction selectivity toward C2+ products on a copper-chloride (CuCl)-derived catalyst is reported here. Using a novel wet-oxidation process, both the oxidation state and morphology of Cu surface are controlled, providing uniformity of the electrode morphology and abundant surface active sites. The Cu surface is partially oxidized to form an initial Cu (I) chloride layer which is subsequently converted to a Cu (I) oxide surface. High C2+ selectivity on these catalysts are demonstrated in an H-cell configuration, in which 73% Faradaic efficiency (FE) for C2+ products is reached with 56% FE for ethylene (C2H4) and overall current density of 17 mA cm-2. Thereafter, the method into a flow-cell configuration is translated, which allows operation in a highly alkaline medium for complete suppression of CH4 production. A record C2+ FE of ≈84% and a half-cell power conversion efficiency of 50% at a partial current density of 336 mA cm-2 using the reconstructed Cu catalyst are reported.

Original languageEnglish
Article number1804867
Number of pages7
JournalAdvanced Materials
Volume30
Issue number49
DOIs
Publication statusPublished - 2018
Externally publishedYes

Keywords

  • CO electroreduction
  • Cu-based catalysts
  • flow-cells
  • hydrocarbons

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