The bias potential is important in the process of photoelectrocatalytic
oxidation of formaldehyde. Different photocurrents of
Ti/TiO2 electrode in the absence and presence of formaldehyde
was studied for bias potential ranged between 0.2 and 1.4 (Fig. 7).
The results showed that potential 0.8 V was as optimal as bias
potential. The application of positive potential across the Ti/TiO2
photoelectrode could produce a potential gradient inside the