Analysis of the NiCo2O4 spinel surface with Auger and X-ray photoelectron spectroscopy

Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

“…3(A), the peak of the Co 2p 3/2 BE for all the samples appeared at around 779.7-780.1 eV, which is in good agreement with the reference data for Co 3 O 4 [27,28]. Imamura et al [29] found an interaction of Mn-Ce over manganesecerium composite oxide.…”

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

“…The sensitivity factor includes XPS or AES cross sections, electron escape depth and a spectrometer transmission function for data taken under the specifi c spectral conditions. These values have been reported elsewhere for nickel and cobalt oxide standard compounds [62] and [63].…”

“…verse spinel distribution. For these materials, the O 1s is comparable with that of NiO [62] and [63]. Ni 3+ has been reported as a "defect structure" in NiO and oxidized nickel metal substrates [64], [65], [66], [67] and [68]; however the O 1s binding energy associated with this species is generally reported at values well in excess of 530 eV.…”

Nature of oxygen at rocksalt and spinel oxide surfaces

“…The powder samples (Ni 2 Co 2 O 4 and MnCo 2 O 4 ) were by necessity synthesized under flowing, dry air at atmospheric pressures [13][14][15][16] and exposed briefly ͑ϳ15 min͒ to ambient air in transferring them to UHV. This is ample time and opportunity for substantial hydroxylation to occur and the O 1s XP spectrum can arguably be fit to three or more peaks ͑Fig.…”