Abstract
The photochemical reaction expressed by 2Fe 2+ + I − 3 + light →2FE 3 + 3I − is applied to the water-splitting cycles hybridized by photochemical and electrochemical reactions (Yokohama Mark 5), and by photochemical, electrochemical, and thermochemical reactions (Yokohama Mark 6). The theoretical expression for the conversion efficiency of light energy to chemical energy is derived using the reaction dynamics, and the factor which maximizes it and the Gibbs free energy change ΔG are studied. The magnitude of stored energy depends on the intensity of light, the concentration of the reactants, and the kind of anions existing in the solution. Considering the reactivity of the photochemical process and the retardation of the back reaction, the SO 4 2− system yields a large value of ΔG. A value of 15–20% is finally obtained for the efficiency of the photochemical conversion process.
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