Reactivity of the H2O2/TiO2 system

The reactivity of the H₂O₂/TiO₂ system for samples treated at atmospheric pressure is studied by means of Auger Electron Spectroscopy. The most significant changes on the TiO₂ ‘final’ state are: (i) The I(O)/I(Ti) peak-to-peak ratio is diminished by 15%. (ii) The LMV transition suffers an energy shift of +2 eV, whereas the peak-to-peak width diminishes 1.5 eV. (iii) Its structure changes with respect to that of the TiO₂ ‘initial’ state although it is not identified with any one of the known stoichiometric oxides. (iv) When the samples that represent the ‘final’ state are heated up to 650 K, the AES spectrum matches quite well that of the TiO₂ ‘initial’ state.