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(I) XPS spectra of Ti 2p (a) and O 1s (b) of P25 and black TiO2 samples. (II) Electron paramagnetic resonance (EPR) spectra of compact pellets sintering at 500 °C (BT500) and P25 powder sintering at 500 °C (PBT500) under vacuum condition. (III) Scheme of formation of low-energy sites via sintering in a vacuum. Reprinted with permission from [32]. Copyright 2018, American Chemical Society.
