Journal
NATURE CATALYSIS
Volume 6, Issue 4, Pages 319-331Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41929-023-00938-z
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A supersaturation strategy was employed to electrosynthesize 2-propanol from CO2 using highly carbonated electrolytes. The CuAg alloy catalyst exhibited high performance for 2-propanol production with a faradaic efficiency of 56.7% and at a specific current density of 59.3 mA cm(-2).
The electroreduction of CO2 has recently achieved notable progress in the formation of C-2 products such as ethylene and ethanol. However, the direct synthesis of C-3 products is considerably limited by the C-2-C-1 coupling reaction and the faradaic efficiency has remained low. Here we present a supersaturation strategy for the electrosynthesis of 2-propanol from CO2 in highly carbonated electrolytes. By controlling the CO2 concentration above the saturation limit, we have developed a co-electrodeposition method with suppressed galvanic replacement to obtain a CuAg alloy catalyst. In supersaturated conditions, the alloy achieved high performance for the production of 2-propanol with a faradaic efficiency of 56.7% and at a specific current density of 59.3 mA cm(-2). Our investigations revealed that the presence of dispersed Ag atoms in Cu weakens the surface binding of intermediates in the middle position of the alkyl chain and strengthens the C-O bonds, which favours the formation of 2-propanol over 1-propanol.
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