The reaction stoichiometry and quantum efficiency of the reaction are reported at various irradiation intensities. An interactive and non-steady state transient photocatalytic reaction is observed between surface carbon species and strongly adsorbed H 2O brought to the exterior surface of the pellet via UV photodesorption from within the deeper lying pores of the pellet. Complementary results are also provided following similar UV irradiations and reaction procedures in an evacuated in situ reaction cell of a Fourier-transform infrared spectrometer (FTIR). 181 (2008) 2549.This paper explores the transient photocatalytic oxidation mechanism of carbon contaminants from a high surface area anatase TiO 2 pellet under starved water/oxygen reaction conditions created when specimens are irradiated via a 375 nm UV laser inside the UHV analysis chamber of an XPS spectrometer. 2 Commercially Pure Binary Oxides” XPS International Inc. Crist “Handbook of Monochromatic XPS Spectra, Vol. Bomben, Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer Corp., Eden Prairie, MN, 1992. 8H20) taken from standards (courtesy of V. Peak 1: 778.1 eV, FWHM 0.93 eV, asymmetry parameter in CasaXPS LA(1.2,2,20) Peak 5: Peak 1 + 9.56, FWHM 1.88 eV, Area = Peak 2 * 0.02361įitting parameters for CoP from references and. Note: Be forewarned that this has caused some confusion in the literature.įitting parameters for CoCr2O4 used in reference are as follows:
This appears to be a common problem with two published databases showing similar Co3O4 oxidized surfaces for CoO. Initial analysis of a commercial CoO sample showed the surface to be extensively oxidized to Co3O4 even though the bulk powder XRD spectrum showed only CoO. Obtaining a pure CoO specimen for analysis is problematic. Co 2p3/2 spectral fitting parameters: binding energy (eV), percentage of total area, FWHM value (eV) for each pass energy, and spectral component separation (eV).
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