Ga-Based Ga @ In 4 Ag 9 /Cu for CO 2 Electroreduction to CO in a Three-Chamber Electrolyzer: With NaOH and Cl 2 as Byproducts

Electroreduction of carbon dioxide (CO RR) using renewable energy offers a sustainable approach for generating valuable chemicals. In this study, a three-chamber electrolyzer was utilized for the direct coproduction of CO, Cl , and NaOH from CO and NaCl electrolysis, contributing to net CO consumption and supporting industries like phosgene synthesis. To improve the electrolyzer performance, a Ga-based metal composite catalyst (Ga In Ag /Cu) was developed. This catalyst efficiently reduced CO to CO during long-term electrolysis, achieving a CO partial current density of 147.16 mA·cm and a faradaic efficiency of 93.1% at -2.4 V (vs SHE). Density functional theory (DFT) calculations revealed that Ag atoms modulate the d-band center of Ga In Ag /Cu, enhancing its interaction with the reaction intermediates. This work introduces a Ga-based porous catalyst for CO electrolysis in organic electrolytes, offering a promising system for the coproduction of CO, Cl , and NaOH through a coupled reaction.