Valence-band electronic structure ofCo3O4epitaxy on CoO(100)

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

“…At 529.2 eV, the value for the LiCoO 2 sample is equal to or only slightly lower than that reported for lattice oxygen in Co 3 O 4 (529.2-529.5 eV; refs. [53], [54], [55] and [56]), and slightly lower than that for CoO (529.4-529.6 eV; refs. [53], [55], [56], [57] and [58]).…”

“…[53], [54], [55] and [56]), and slightly lower than that for CoO (529.4-529.6 eV; refs. [53], [55], [56], [57] and [58]). Furthermore, doping cobalt oxide powders with lithium for up to 50% of the total metal concentration does not appear to change the O 1s binding energy signifi cantly [54].…”

Cobalt oxide surface chemistry: The interaction of CoO(100), Co3O4(110) and Co3O4(111) with oxygen and water

“…The intense satellite structure of the Co 2p monoxide spectrum depends upon hybridization between highspin Co 2+ 3d 7 and lattice anion O 2p states [21][22][23]:…”

“…UHV conditioning was performed in repeated cycles of Ar + sputtering (4 × 10 −3 Pa Ar, 2 kV, 3 μA/cm 2 , 15 min), oxygen annealing (7 × 10 −5 Pa O 2 , 523 K, 15 min), and UHV annealing (≤4 × 10 −8 Pa, 10 min) until the surface was stoichiometric by Auger (AES) and X-ray photoelectron (XPS) spectroscopies, and characteristic binding energies and peak shapes were achieved in XPS. This procedure is described in greater detail elsewhere [7,8]. Characteristic XPS peak shapes and surface stoichiometry were confirmed by comparison to a CoO(1 0 0) surface prepared by UHV cleavage.…”

“…The distortion and the antiferromagnetic character of CoO are often ignored in discussions of the surface reactivity. However, the high-spin nature of the d 7 cation results in a fairly complex electronic structure that is reflected in both valence and cobalt core level cobalt photoemission.…”