A semiconductor composite of CdS particles embedded in a TiO2 gel after heat treatment at 250°C in air is revealed to show catalytic H2 evolution from an EDTA aqueous solution with light of λ ≤ 450 nm, in contrast to bare CdS which is stoichiometrically photocorroded. A significant improvement in the activity even with considerable loses of CdS in the gel during the heat treatment suggests that the TiO2 gel crystallized into anatase can prevent photocorrosion of CdS embedded therein, and serve as a semiconducting matrix to facilitate charge transfer from the embedded CdS to Pt at the surfaces of the gel.
All Science Journal Classification (ASJC) codes
- Process Chemistry and Technology
- Physical and Theoretical Chemistry