Abstract: Mercurochrome was used as a sensitizer to sensitize TiO₂nanoporous electrode. The UV-Vis, photocurrent and photovoltage spectra indicated that the sensitizer could extend efficiently the response of anodic photocurrent to the visible region, and the aggregated dye could extend the sensitized region. The transient photocurrent of the sensitized electrode was measured at different biases and the influence of the bias on the rate of the light-induced electron transfer and recombination was studied too. Illumination from different directions could markedly influence the generation of anodic photocurrent. The mechanism of the generation of the photocurrent and the recombination of the light-induced charge were discussed by combining the electrochemistry, photoelectrochemistry and UV-Vis spectra.

Key words: Mercurochrome-sensitization, TiO₂nanoporous electrode, Photoelectrochemistry, Photocur- rent, Bias