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  4. Sequential Cascade Electrocatalytic Conversion of Carbon Dioxide to C-C Coupled Products
 
research article

Sequential Cascade Electrocatalytic Conversion of Carbon Dioxide to C-C Coupled Products

Gurudayal, Gurudayal
•
Perone, David
•
Malani, Saurabh
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2019
Acs Applied Energy Materials

Cascade catalytic processes perform multi-step chemical transformations without isolating the intermediates. Here, we demonstrate a sequential cascade pathway to convert CO2 to C2+ hydrocarbons and oxygenates in a two-step electrocatalytic process using CO as the intermediate. CO2 to CO conversion is performed by using Ag and further conversion of CO to C-C coupled products is performed with Cu. Temporal separation between the two reaction steps is accomplished by situating the Ag electrode upstream of the Cu electrode in a continuous flow reactor. Convection-diffusion simulations and experimental evaluation of the electrodes individually were performed to identify optimal conditions. With the upstream Ag electrode poised at -1 V vs RHE in a flow of CO2-saturated water in aqueous carbonate buffer, over 80% of the CO can be converted on the downstream Cu electrode. When the Ag electrode is on, a supersaturation of CO is achieved near the Cu electrode, which leads to a relative increase in the formation rate of C2 and C3 oxygenates as compared to ethylene.

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Type
research article
DOI
10.1021/acsaem.9b00791
Author(s)
Gurudayal, Gurudayal
Perone, David
Malani, Saurabh
Lum, Yanwei
Haussener, Sophia  
Ager, Joel
Date Issued

2019

Published in
Acs Applied Energy Materials
Volume

2

Issue

6

Start page

4551

End page

4559

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LRESE  
Available on Infoscience
May 29, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/156585
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