In this publication, we report the observation of photogalvanic effects arising from chlorophyll a-quinhydrone (Q: H2Q, 1:1) half-cell reactions. Platinum electrodes have been employed. In the presence of light, a photocurrent is developed as Chl a aggregates presumably undergo a charge-transfer interaction that results in the creation of a p-type semiconductor film. The observed photopotential at the Pt-Chl a electrode is positive. When the light is turned off, the half-cells regress toward the preillumination conditions, and a reverse current is observed. The spectral response of the photogalvanic effect has been determined. It has been found that a distribution of Chl a-H2O aggregates contribute to the observed photocurrent. The in vitro solar conversion results are discussed in terms of the recently proposed primary light reaction model of photosynthesis.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry