Adsorption of NH3 on oxygen pre-treated Ni(111)

Initial oxidation of polycrystalline Permalloy surface

“…The Ni(2p 3/2 ) signal could be decomposed in the following components: a first peak at 852.8 ± 0.1 eV with its satellite at 858.8 ± 0.1 eV corresponding to the metallic nickel, a doublet (854.1 and 855.9 ± 0.1 eV) and a shake-up satellite at 861.2 ± 0.1 eV assigned to the Ni 2+ state in the NiO and a third contribution at 855.8 ± 0.1 eV together with its correlation satellite at 861.6 ± 0.1 eV assigned to hydroxylated Ni 2+ . All of these binding-energy positions are in full agreement with literature data [18,20,25,26]. Table 1 presents all the curve fitting parameters.…”

“…In the case of oxide states, the lineshape is also asymmetric and broadened because of the multiplet splitting caused by the interaction between the 2p electrons and the unpaired 3d electrons and at the origin of a multitude of possible final states [17]. Consequently, the metal and oxide lineshapes of the 2p spectra were taken into consideration by using an asymmetric peak function, except for the nickel oxide 2p 3/2 envelop, which was fitted by using two symmetric peaks [18].…”

“…For oxidized nickel, we used the results reported by Laksono et al [18] to examine the nickel oxidation. For the 2p region, the intensity of each 2p 1/2 component was fixed at half the intensity of the 2p 3/2 one, and the asymmetry parameters and the GL ratio of the 2p 3/2 and 2p 1/2 mains peaks were set equal.…”

II. Structural, morphological, chemical and electrochemical analysis of nickel covered by electrochemically deposited Co3O4 in molten Li2CO3–Na2CO3 at 650 °C

“…In addition to intensity differences, the shape of the Ni 2p 3/2 peak is markedly different before and after 60 min of immersion as the main feature is located at 855.8 ± 0.2 eV up to Co 3 O 4 -NiO-60 (see Table 1) and at 854.7 ± 0.2 eV for immersion times longer than 60 min. By comparison with published data, the BE of 855.8 ± 0.2 eV may correspond to the presence of nickel-based spinels [14], while the BE of 854.7 ± 0.2 eV is characteristic of NiO [15] as the major species. The hypothesis of LiNiO 2 can be excluded by comparison with the literature data [10].…”

Growth of thin epitaxial alumina films onto Ni(111): an electron spectroscopy and diffraction study

“…Other explanation can be found in the presence of adsorbed hydroxyl groups, which is widely reported on Ni substrates. [12,20] Despite the high temperature during the deposition process, cooling the samples down after the deposition in an oxygen atmosphere could enable the adsorption of hydroxyl groups.…”