Ag–Sb/Cu by Galvanic Replacement: Electrochemical CO<sub>2</sub> Reduction and Unveiling C<sub>3+</sub> Hydrocarbon Pathways
Sooyeon Bae, Seon Young Hwang, Gaeun Yun, Yunji Gwon, So Young Kim, Choong Kyun Rhee, Youngku Sohn
Abstract
Ag/Cu electrodes have garnered substantial attention as extensively explored bimetallic catalysts in electrochemical (EC) CO 2 reduction, demonstrating efficient C–C coupled production. In this study, we broaden the horizon by introducing antimony (Sb) through galvanic replacement, resulting in the formation of Ag–Sb–Cu mesh electrodes. We systematically investigate the synergistic effects of this ternary system on EC CO 2 reduction, delving into various experimental conditions such as applied potentials, electrolytes, concentrations, and diverse modifications to the electrodes. The primary reduction products identified include CO, formate, CH 4, C 2 H 4, ethanol, and propanol. The incorporation of Sb and Ag on Cu significantly enhances the yields of the C 1, C 2, and C 3 products. Additionally, we consistently identify and comprehend the reaction pathway leading to alkene-dominant C 3+ hydrocarbons through the conventional Fischer–Tropsch synthesis mechanism. These findings illuminate the intricate interplay among the three metals, offering valuable insights for optimizing the catalytic performance in enhanced CO 2 reduction.