| Popis: |
TiO2, platinized TiO2, and platinized Pt anodes have been studied in both acidic and basic electrolytes in the presence of ethanol. In the case of macroscopic platinized TiO2 anodes, the oxidation of ethanol to acetaldehyde and the further oxidation of acetic acid is predominantly a catalytic rather than a photocatalytic effect, and can be accomplished in the dark with a bias voltage of approximately 0.6 V. This same result has been shown to occur with platinized Pt electrodes in the absence of TiO2. Cyclic voltammetry studies suggest that oxidation of acetic acid, previously reported in particulate platinized TiO2 systems, requires the production of the highly reactive OH radical. Thus both catalytic and photocatalytic processes are occuring simultaneously at illuminated platinized TiO2 anodes. |
