Formation of $I_2$ by a Photocatalytic Reaction of Rose Bengal

In the process of solar energy conversion into electrical energy using the photoelectrochemical cell containing the sensitizer, rose bengal and supersensitizer. , the photocurrent is stabilized and durable. But the long time span of irradiation causes the decrease of photocurrent monotonically. Spectroscopic and electrochemical analyses of rose bengal solution containing revealed that the decrease of concentration of rose bengal was attributed to the reaction of rose bengal in the dark with formed as a result of the possible photocatalytic reaction of rose bengal with .