Peak-fitting of Cu 2p photoemission spectra in Cu0, Cu1+, and Cu2+ oxides: A method for discriminating Cu0 from Cu1+

Structural Transformation of Supported, Intercalated, and Doped Cu Nanostructures on FeO/Pt(111) under Oxidizing and Reducing Conditions

“…Each Cu dopant atom in the linear form is coordinated by two O atoms, while one O atom is 2-fold-coordinated and another O atom is 3-fold-coordinated (denoted as Cu x Fe y O z /Pt­(111)). XPS Cu 2p spectra of doped Cu in FeO show the presence of a small satellite peak (Figure S6a), which excludes the existence of Cu 2+ . , XPS Cu LVV Auger spectra of Cu dopants in FeO show the same peak position as that of Cu 2 O/Pt­(111) (Figure S6b), , confirming that the valence state of Cu dopants is close to +1.…”

“…XPS Cu 2p spectra of doped Cu in FeO show the presence of a small satellite peak (Figure S6a), which excludes the existence of Cu 2+ . 40,59 XPS Cu LVV Auger spectra of Cu dopants in FeO show the same peak position as that of Cu 2 O/Pt(111) (Figure S6b), 58,60 confirming that the valence state of Cu dopants is close to +1. After annealing at 500 K in 5 × 10 −6 mbar CO, Cu dopants begin to be reduced (Figures S7a,b).…”

Controlling the C1/C2+ product selectivity of electrochemical CO2 reduction upon tuning bimetallic CuIn electrocatalyst composition and operating conditions

“…The intensity of peak E could be related to the Cu + /Cu 2+ ratio. 60,61 Notably, weaker Cu + 2p 1/2 and Cu + 2p 3/2 peaks were present upon increasing the Cu content from InCu 5 O x to InCu 73 O x materials. Fig.…”

Cu/2D-CuOx Nanocomposites with Abundant Oxygen Vacancy Defects for Enhancing Ammonia Selectivity of Electrocatalytic Nitrate Reduction

“…To examine oxygen vacancies and the element valence states of Cu in Cu/2D-CuO x , XPS was performed (Figures S1 and b,c). Figure b shows the Cu 2p spectrum in which two fitted peaks at binding energies of 932.47 and 952.27 eV can be attributed to the Cu 0/1+ species. ,, The peaks at binding energies of 934.31 and 954.1 eV were attributed to Cu 2+ . The green peaks corresponded to the satellite of Cu 2+ . , Figure S2 displays the Cu + Auger peak at 570 eV, along with weak Cu 2+ (569 eV) and Cu 0 (568 eV) Auger peaks, indicating that the surface of Cu/2D-CuO x mainly contained Cu + in the oxidized state.…”

“…Figure 3b shows the Cu 2p spectrum in which two fitted peaks at binding energies of 932.47 and 952.27 eV can be attributed to the Cu 0/1+ species. 21,22,48 The peaks at binding energies of 934.31 and 954.1 eV were attributed to Cu 2+ . The green peaks corresponded to the satellite of Cu 2+ .…”