ELECTROCHEMICAL PROPERTIES OF SEMICONDUCTING TIO2 (RUTILE) SINGLE-CRYSTAL ELECTRODE

The electrochemical behaviour of semiconducting TiO//2 electrodes were investigated by means of impedance, current and potential measurements in darkness, and as well in indifferent electrolyte as in redox electrolyte solutions. The results allow the determination of the flat-band potential and of the position of the energy band edges at the TiO//2 surface. The data obtained on electrochemical reactivity, both anodically and cathodically, appear to be qualitatively interpretable on the basis of the accepted theories for direct electron transfer at the semiconductor/electrolyte interface. Some particular features inherent to the TiO//2/electrolyte system are discussed.