Abstract
The sorption of Na + and Cl − electrolyte ions from an aqueous solution onto single crystal TiO 2 has been the subject of an investigation using XPS in combination with in situ cryogenics. In particular the samples were decontaminated from adventitious carbon by annealing at 600 °C prior to the exposure to aqueous solution. Further, the subsequent transfer of the sample to the spectrometer was performed in a liquid nitrogen filled hollow sample holder in order to preserve the chemistry and structure at the sample surface. The presence of an ionic layer consisting of H 2O, Na + and Cl − has been confirmed using angular dependent XPS, where the electrolyte ions are distributed in at least 2–3 monolayers.
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