A
composite system of SnO2/ZnO semiconductors was found to generate a higher H2O2 yield than individual
oxide semiconductors when they were sensitized with various dyes. The optimum quantum yields for H2O2 generation
were found to be 6.00 × 10−2, 4.05 × 10−2 and 3.33 × 10−2, respectively, for Eosin Y, Rose Bengal and Rhodamine
6G. Under similar conditions, Eosin Y showed quantum yields of 2.03 × 10−2 and 2.34 × 10−3, respectively, for ZnO and
SnO2 particles. With the higher yield of H2O2 for the composite system, the possibility of electron
transfer from the low band position semiconductor to the high band position semiconductor is demonstrated and is attributed
to the transfer of injected
high-energy electrons from the excited dye molecules on SnO2 to ZnO particles.
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