2026-04-17T02:57:26Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/5328012024-12-20T19:17:39Zcom_2072_300912com_2072_4427col_2072_301309

00925njm 22002777a 4500 dc Zou, Tangsheng author Veenstra, Florentine L.P. author Ibáñez-Alé, Enric author García-Muelas, Rodrigo author Zichittella, Guido author Martín, Antonio J. author López, Núria author Pérez-Ramírez, Javier author 2023-03-15 Chlorinated copper catalysts have shown promise for electroreduction of carbon dioxide to complex products, but the challenging control of chlorination keeps shaded the potential of chlorine as a selectivity promoter. This work develops a gas-phase chlorination strategy based on exposure to diluted hydrochloric acid at different temperatures to study the effect of chlorine content in copper (II) oxide (CuO), copper (I) oxide (Cu2O), and metallic copper (Cu) foils. Contrary to CuO and Cu, chlorination of Cu2O enhances the formation of highly reduced products (those requiring more than two electron transfers). Faradaic efficiency toward these products (0%–14% at -0.8 V vs. the reversible hydrogen electrode) correlates with the surface chlorine content after reaction (0 to 1.8 atom % chlorine), which is maximized for mild initial chlorination degrees (Cu2O:CuCl∼1). Experimental and computational studies suggest metallic copper surfaces with moderate chlorine coverage and oxychloride-like clusters are active sites responsible for the promotional effect. These findings may facilitate structure-performance relationships, forwarding the next generation of this family of catalysts. http://hdl.handle.net/2072/532801 https://doi.org/10.1016/j.xcrp.2023.101294 Chlorine-promoted copper catalysts for CO2 electroreduction into highly reduced products