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

Title

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

 Author

De Gregorio, Gian Luca (Swiss Federal Institute of Technology)
Burdyny, T.E. (TU Delft ChemE/Materials for Energy Conversion and Storage) ORCID 0000-0001-8057-9558
Loiudice, Anna (Swiss Federal Institute of Technology)
Iyengar, Pranit (Swiss Federal Institute of Technology)
Smith, W.A. (TU Delft ChemE/Materials for Energy Conversion and Storage) ORCID 0000-0001-7757-5281
Buonsanti, Raffaella (Swiss Federal Institute of Technology)

Date

2020

 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.


 Subject

copper
electrochemical CO reduction
gas-diffusion electrolyzer
nanocatalyst
structural selectivity

 To reference this document use:

http://resolver.tudelft.nl/uuid:4a6689bf-fe02-4bf6-9429-e2ce65405ccd

 DOI

https://doi.org/10.1021/acscatal.0c00297

 ISSN

2155-5435

 Source

ACS Catalysis, 10 (9), 4854-4862

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2020 Gian Luca De Gregorio, T.E. Burdyny, Anna Loiudice, Pranit Iyengar, W.A. Smith, Raffaella Buonsanti
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