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Publications - ISI Article

Steering Cu-Based CO2RR Electrocatalysts’ Selectivity: Effect of Hydroxyapatite Acid/Base Moieties in Promoting Formate Production

Related tags

#CO2 Storage #Greenhouse Gas #Hydrogen

Publications - ISI Article

Steering Cu-Based CO2RR Electrocatalysts’ Selectivity: Effect of Hydroxyapatite Acid/Base Moieties in Promoting Formate Production

The increase in greenhouse gas CO2 concentration raises serious concerns to be addressed through all technologically possible means. The chemical reaction of CO2 reduction (CO2RR) is a challenge that requires not only energy input but also the use of catalysts. This work demonstrates that an amphoteric additive of calcium phosphate (hydroxyapatite, HAP, Ca10(PO4)6(OH)2) alters the product distribution from Cu-based catalysts, guiding CO2RR selectivity towards liquid oxygenated products, promoting formate production over gaseous CO.

Among all active metals for the CO2 reduction reaction (CO2RR), copper is the only one that exhibits an optimal binding energy with *CO for simultaneous transfer of multiple electrons. Despite this unique characteristic, the industrial-scale use of Cu-based CO2RR catalysts is hindered by high overpotentials and poor selectivity. In this context, introducing acidic/basic functionalities on the catalyst surface can help overcome scaling relationships (i.e., reducing CO2RR overpotentials) and regulate the selectivity of Cu-based catalysts.

 

In this study, we demonstrate that the amphoteric additive calcium phosphate (hydroxyapatite, HAP, Ca10(PO4)6(OH)2) alters the product distribution from Cu-based catalysts, directing CO2RR selectivity towards liquid oxygenated products and promoting formate production over CO.

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Rif.RSE​

22014197

Destination​

ACS Energy Letter, Vol. 7, pp. 2304-2310

Publication Date

13 January 2022

Authors​

M. Ferri, S. Campisi, A. Gervasini (University of Milan), L. Delafontaine, Shengyuan Guo, Tristan Asset (University of California)

Publication Type

ISI Article

Projects

Hydrogen technologies (Hydrogen)

Target​

Press & Media

Related tags

#CO2 Storage #Greenhouse Gas #Hydrogen

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