Journal
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
Volume 342, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123444
Keywords
La2-xAgxCuO4-delta perovskite; A-site substitution; CO2 reduction reaction; Multi-carbon products
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In this study, a La2-xAgxCuO4-delta catalyst was reported, which exhibits enhanced activity and selectivity for CO2RR by tuning the A-site cations with Ag doping. The research reveals that Ag doping can tune the electronic structure of Cu2+ ions, improving the adsorption/activation of crucial reaction intermediates, and shifts the reaction pathways, thereby promoting the formation of multi-carbon products.
The electrochemical CO2 reduction reaction (CO2RR) has been widely recognized as a promising approach to achieve the carbon cycle balance in human society. However, potent electrocatalysts are required to achieve the selective conversion of CO2 to high value-added chemical products. Here, we reported a Ruddlesden-Popper layered perovskite catalyst, namely La2-xAgxCuO4-delta, which exhibits enhanced activity and selectivity towards CO2RR by tuning the A-site cations with Ag doping. Combinatorial characterizations and theoretical calculation reveal the partial replacement of Ag+ on the A-site of La2CuO4 can tune the electronic structure of Cu2+ ions of the B site, improving the adsorption/activation of crucial reaction intermediates. Importantly, Ag doping constructs oxygen vacancies, which shifts the reaction pathways from the two-electron transfer reduction to the multi-electron/proton transfer reduction, thereby promoting the formation of multi-carbon products. Taken together, these findings offer fresh insights for the strategic development of efficient perovskite electrocatalysts for CO2RR.
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