Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.133
Publication date: 18th December 2023
CO2 electroreduction (CO2RR) using renewable electricity is a versatile technology capable of replacing fossil resources in the flexible production of fuels and valuable chemicals. Among the various products generated, CO is notable because of its role in numerous industrial processes, including its application in syngas production along with H2.
Appropriate electrolyte selection is crucial to ensure good selectivity and efficiency in the electroreduction process. Halides have emerged as compelling candidates, offering stabilizing effects on the reaction intermediates in the CO2RR and localized pH control at the CO2-electrode interface, preventing the formation of species that could compromise reaction selectivity, electrode stability, and recyclability. [1]
Au catalysts exhibit high CO-faradaic efficiencies and selectivity at low overpotentials; however, their widespread use is hindered by their associated high cost. Thus, bimetallic AuX alloys have been proposed. Au-Cu is particularly intriguing, as Cu is a unique metal capable of generating high-value C1–C4 products (e.g., CO, alcohols, and other hydrocarbons) along with the well-known favourable Cu-halide interactions in CO2RR. [2]
Despite the apparent convergence of Au-based catalysts and halide electrolytes in CO production, few strategies have been reported for functionalizing Au-Cu alloys with halides, especially after Cu–Cl– interactions. Although studies have been conducted on halide adsorption on Au electrodes, CO2RR conditions are far from optimal for their application.
This work demonstrates high Faradaic efficiencies in C1 products, especially CO, using Au-Cu alloy electrodeposited onto a gas diffusion electrode with chloride as a catholyte in a CO2-flow cell. As a result, a positive effect of chloride on gold in the presence of copper was observed, which encourages further exploration of new electrode-electrolyte configurations that may, in some cases, enhance Cu performance in obtaining C1 products.
This work has been funded by the projects PID2019-108136RB-C33, PID2022-138491OB-C33 (MCIN/AEI/10.13039/501100011033), and Industrial Doctorate Plan from the Generalitat de Catalunya (2021DI20).
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