Facet-Dependent Selectivity of Cu Catalysts in Electrochemical CO2 Reduction at Commercially Viable Current Densities

Gian Luca De Gregorio, Thomas Burdyny, Anna Loiudice, Pranit Iyengar, Wilson A. Smith, Raffaella Buonsanti

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)
18 Downloads (Pure)

Abstract

Despite substantial progress in the electrochemical conversion of CO2 into value-added chemicals, the translation of fundamental studies into commercially relevant conditions requires additional efforts. Here, we study the catalytic properties of tailored Cu nanocatalysts under commercially relevant current densities in a gas-fed flow cell. We demonstrate that their facet-dependent selectivity is retained in this device configuration with the advantage of further suppressing hydrogen production and increasing the faradaic efficiencies toward the CO2 reduction products compared to a conventional H-cell. The combined catalyst and system effects result in state-of-the art product selectivity at high current densities (in the range 100-300 mA/cm2) and at relatively low applied potential (as low as-0.65 V vs RHE). Cu cubes reach an ethylene selectivity of up to 57% with a corresponding mass activity of 700 mA/mg, and Cu octahedra reach a methane selectivity of up to 51% with a corresponding mass activity of 1.45 A/mg in 1 M KOH.

Original languageEnglish
Pages (from-to)4854-4862
JournalACS Catalysis
Volume10
Issue number9
DOIs
Publication statusPublished - 2020

Keywords

  • copper
  • electrochemical CO reduction
  • gas-diffusion electrolyzer
  • nanocatalyst
  • structural selectivity

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