Ultraviolet photoelectron spectra (UPS) of lithium nickel oxide (Li x Ni2-x O2, 0 < x 1.0) solid solution were measured using a synchrotron radiation light source. The upper valence UPS are confirmed to consist of five structures for E < 15 eV. The electronic density of two O2p states changed as the compositional ratio of Li and Ni. After a contact reaction of LiNiO and methane gas, the peak intensity of one of two O2p states decreased remarkably. It was found that the surface oxygen at the lower binding energy was selectively contributed to dissociate σ-bond between carbon and hydrogen of methane. ;copy; 2014 Springer Science+Business Media Dordrecht.
- Lithium nickel oxides
- Oxidative coupling of methane
- Selective oxidation
- Ultraviolet photoemission spectroscopy
- Valence band structure
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