1. Comparative Study of the Photocatalytic Hydrogen Evolution over Cd 1−x Mn x S and CdS-β-Mn 3 O 4 -MnOOH Photocatalysts under Visible Light.
- Author
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Potapenko, Ksenia O., Kurenkova, Anna Yu., Bukhtiyarov, Andrey V., Gerasimov, Evgeny Yu., Cherepanova, Svetlana V., Kozlova, Ekaterina A., and Deligiannakis, Yiannis
- Subjects
HYDROGEN evolution reactions ,VISIBLE spectra ,PHOTOCATALYSTS ,X-ray photoelectron spectroscopy ,MANGANOUS sulfide ,SOLID solutions - Abstract
A series of solid solutions of cadmium and manganese sulfides, Cd
1−x Mnx S (x = 0–0.35), and composite photocatalysts, CdS-β-Mn3 O4 -MnOOH, were synthesized by precipitation with sodium sulfide from soluble cadmium and manganese salts with further hydrothermal treatment at 120 °C. The obtained photocatalysts were studied by the X-ray diffraction method (XRD), UV-vis diffuse reflectance spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N2 low temperature adsorption. The photocatalysts were tested in hydrogen production using a Na2 S/Na2 SO3 aqueous solution under visible light (λ = 450 nm). It was shown for the first time that both kinds of photocatalysts possess high activity in hydrogen evolution under visible light. The solid solution Cd0.65 Mn0.35 S has an enhanced photocatalytic activity due to its valence and conduction band position tuning, whereas the CdS-β-Mn3 O4 -MnOOH (40–60 at% Mn) samples were active due to ternary heterojunction formation. Further, the composite CdS-β-Mn3 O4 -MnOOH photocatalyst had much higher stability in comparison to the Cd0.65 Mn0.35 S solid solution. The highest activity was 600 mmol g−1 h−1 , and apparent quantum efficiency of 2.9% (λ = 450 nm) was possessed by the sample of CdS-β-Mn3 O4 -MnOOH (40 at% Mn). [ABSTRACT FROM AUTHOR]- Published
- 2021
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