fig10

Figure 10. (A) Urea synthesis schematic diagram at Pd₁Cu₁/TiO₂-400; (B) Formation rate of urea at Pd₁Cu₁/TiO₂-400; (C) The current density and FE for each product at different potentials at Pd₁Cu₁/TiO₂-400. Reprinted with permission from ref^[13]. Copyright 2020 Nature Publishing Group; (D and E) O 1s XPS of (D) TiO₂ without doping and (E) Cu-TiO₂; (F and G) Cu 2p XPS of (F) CuO and (G) Cu-TiO₂; (H and I) Ti 2p XPS of (H) TiO₂ without doping and (I) Cu-TiO₂. Reprinted with permission from ref^[21]. Copyright 2020 Elsevier Inc. FE: Faradaic efficiency; XPS: X-ray photoelectron spectroscopy spectra.