1. Novel photocatalysts based on Cd1−xZnxS/Zn(OH)2 for the hydrogen evolution from water solutions of ethanol.
- Author
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Kozlova, Ekaterina A., Markovskaya, Dina V., Cherepanova, Svetlana V., Saraev, Andrey A., Gerasimov, Eugeny Yu., Perevalov, Timofey V., Kaichev, Vasily V., and Parmon, Valentin N.
- Subjects
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CADMIUM compounds , *PHOTOCATALYSTS , *SOLUTION (Chemistry) , *ETHANOL , *HYDROGEN evolution reactions , *X-ray diffraction - Abstract
Multiphase photocatalysts Pt/Cd 1− x Zn x S/ZnO/Zn(OH) 2 , Pt/Cd 1− x Zn x S/ZnO, and Pt/Cd 1− x Zn x S/Zn(OH) 2 were synthesized by a new two-step technique. The photocatalysts were characterized by a wide range of experimental techniques: X-ray diffraction, high-resolution transmission electron microscopy combined with energy-dispersive X-ray spectroscopy, low-temperature N 2 adsorption/desorption, and UV/VIS spectroscopy. The photocatalytic activity was tested in a batch reactor in the reaction of H 2 evolution from aqueous solutions of ethanol under visible light irradiation ( λ > 420 nm). The highest achieved photocatalytic activity was 2256 μmol H 2 per gram of photocatalyst per hour; the highest quantum efficiency was 10.4%. The activity of Pt/Cd 1− x Zn x S/Zn(OH) 2 was higher than that of Pt/Cd 1− x Zn x S/ZnO/Zn(OH) 2 and Pt/Cd 1− x Zn x S/ZnO. The explanation of enhanced activity of zinc–cadmium sulfide/ε-zinc hydroxide based on quantum calculations was suggested. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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