The effect of the hypophosphite ion oxidation on the Ni surface electrode—an XPS study

Replacement Deposition of Ni-S Films on Cu and Their Catalytic Activity for Electroless Nickel Plating

“…Before sputtering, the main peak at 855.6 eV is assigned to Ni 2+ species because Ni is easily oxidized by the atmosphere to form oxides. However, the spectrum after sputtering reveals the dominant presence of metallic Ni (peak at 852.7 eV), [32][33][34] indicating the deposition of metallic Ni film. In addition, the peaks corresponding to sulfur element are observed in the XPS spectra before and after sputtering, attesting codeposition of sulfur with nickel during the replacement reaction.…”

XPS study of 5-chloro-1,2,3-benzotriazole adsorption on nickel surface

“…To assess layer thickness XPS method was applied. In some publications [11][12][13][14][15][16][17][18][19] XPS was used to examine the surface layer composition on nickel and its alloys in various media, and it is accepted that at low anodic potentials the Ni surface is covered with only NiO and Ni(OH) 2 . However Ni2p spectra are complicated by different multiplets, satellite peaks, plasma losses and oxidation states, some difficulties arise in their interpretation [20,21].…”

“…Afterwards specimens were cathodically activated in a three-electrode cell to remove an air formed oxide, and then the anodic potential corresponding to the oxide layer formation was stepwise applied and kept for 60 min. Required amount of 5-chloroBTA was added in the concentration optimally corresponding formation of a monomolecular film, which is defined from ellipsometric data [11]. To remove physically adsorbed molecules of 5-chloroBTA the specimens were sonicated in bidistillate within 10 min, and then immediately transferred to the spectrometer chamber.…”

Fabrication and performance of the Pt-Ru/Ni-P/FTO counter electrode for dye-sensitized solar cells

“…From the XPS spectrum of the Ni 2p 3/2 , the first peak situated around the binding energy of 852.3 eV is attributed to the metallic Nickel; and the other peak at 855.8 eV and 861.0 eV can be ascribed to the Ni(OH) 2 and Ni 2 O 3 [33]. Similarly, the XPS spectrum of P 2p shows two peaks at 129.5 eV and 132.4 eV, which are assigned to elemental phosphorus and the oxidized state, sodium hypophosphite (NaH 2 PO 2 ), respectively [34,35]. Thus it can be concluded that the elemental Ni and P come from the Ni-P alloy coating, and no other compound involved Ni and P is formed on the surface [36].…”