关键词: Ag电极, 光电流, 热电流

Abstract: The influence of heat on the photocurrent of Ag electrode in alkaline solution was investigated by measuring photocurrent, photothermal signal and thermal current under the irraiation of laser beams with the wavelengths of 488 nm and 532 nm. It was found the photocurrent at the Ag 2O film was influenced by the temperature change at the electrode surface under the irradiation of light. During the electrochemical transfer between Ag, Ag 2O and AgO in the anodic film, the surface temperature changed obviously due to the different absorptance of the surface substances. It was suggested by comparing the voltammograms, photocurrent curves and thermal current curves that the anodic photocurrent peak at 0.37 V and the cathodic photocurrent peak at 0.10 V on the photocurrent cycle curves can be attributed to the temperature rise under the irradiation of light. the photocurrent and the thermal current increased proportionately with the increase of light intensity.

Key words: Ag electrode, Photocurrent, Thermal current