Mott‐Schottky Plots and Flatband Potentials for Single Crystal Rutile Electrodes

Ideal Mott‐Schottky plots were obtained for TiO 2 single crystal electrodes after a special surface preparation procedure. Precise flatband potentials were determined as a function of p H for three different types of TiO 2 boules; significant differences between boules were observed. These differences were reflected in corresponding differences in the electrode potential for the onset of anodic photocurrent. Surface treatments that produced linear Mott‐Schottky plots but with frequency dispersion results in apparent flatband potentials that did not correlate with the potential for the onset of anodic photocurrent. Ideal Mott‐Schottky behavior could only be obtained for the specially prepared crystals if the electrolyte concentration was greater than 0.25M.