Electrodeposited AgCu Foam Catalysts for Enhanced Reduction of CO2 to CO

Selective electrochemical reduction of CO2 is an emerging field which needs more active and stable catalysts for its practicability. In this work, we have studied the influence of Ag metal incorporation into Cu dendritic structures on the product distribution and selectivity of CO2 electroreduction....

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Veröffentlicht in:ACS applied materials & interfaces 2019-04, Vol.11 (16), p.14734-14744
Hauptverfasser: Kottakkat, Tintula, Klingan, Katharina, Jiang, Shan, Jovanov, Zarko P, Davies, Veronica H, El-Nagar, Gumaa A. M, Dau, Holger, Roth, Christina
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container_issue 16
container_start_page 14734
container_title ACS applied materials & interfaces
container_volume 11
creator Kottakkat, Tintula
Klingan, Katharina
Jiang, Shan
Jovanov, Zarko P
Davies, Veronica H
El-Nagar, Gumaa A. M
Dau, Holger
Roth, Christina
description Selective electrochemical reduction of CO2 is an emerging field which needs more active and stable catalysts for its practicability. In this work, we have studied the influence of Ag metal incorporation into Cu dendritic structures on the product distribution and selectivity of CO2 electroreduction. Bimetallic AgCu foams prepared by hydrogen bubble templated electrodeposition shift the potentials of CO production to more positive values compared to bulk silver. The presence of Ag during the electrodeposition significantly changed the size and the shape of the dendrites in the pore walls of AgCu foams compared to Cu foam. The CO adsorption characteristics are studied by operando Raman spectroscopy. In the presence of Ag, the maximum CO adsorption is observed at a more positive potential. As a result, an improved selectivity for CO is obtained for AgCu foam catalysts at lower overpotentials compared to Cu foam catalyst, evidencing a synergistic effect between the bimetallic components. We were successful in increasing the CO mass activity with respect to the total Ag amount. AgCu foams are found to retain the CO selectivity during long-term operation, and with their easily scalable electrodeposition synthesis they possess high potential for industrial application.
doi_str_mv 10.1021/acsami.8b22071
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title Electrodeposited AgCu Foam Catalysts for Enhanced Reduction of CO2 to CO
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