Publication date: 28th August 2024
The urgent need to achieve carbon neutrality by 2050 as per the Paris Agreement [1, 2] calls for new strategies to reduce CO2 in the atmosphere. To this aim a key approach consists of the electrocatalytic reduction of CO2 (CO2RR), a process which transforms CO2 into valuable products such as hydrocarbons and alcohols. However, the thermodynamic stability of CO2 makes this solution energy-intensive, necessitating the use of catalytic materials to enhance efficiency. Copper (Cu) is known to produce high energy-density products (C2, C2+) but it shows low selectivity, complicating the final product separation [3-5]. To overcome this limitation, Copper bimetallic compounds or alloys have been explored [6]. Along these lines, our study focuses on the realization of Cu-silver (Ag) electrodes to achieve a synergistic effect that improves the performance compared with pure Cu [7-9]. The major advantage of the resulting material is the simple preparation via a sputtering deposition of Cu followed by a spontaneous galvanic displacement reaction. This eliminates the need for applying a potential for Ag deposition onto the Cu substrate. Our Cu-Ag electrodes show enhanced selectivity for C2 products with respect to the bare Cu ones during the CO2 electrolysis. To understand the fundamental role of Ag in increasing and stabilizing the production of ethanol and ethylene, in-situ X-ray absorption spectroscopy (XAS) results are presented and analysed.
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