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Influence of MoS2 on Activity and Stability of Carbon Nitride in Photocatalytic Hydrogen Production
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Titel: |
Influence of MoS2 on Activity and Stability of Carbon Nitride in Photocatalytic Hydrogen Production |
In: | Catalysts, 9, 2019, 8, S. 695 |
veröffentlicht: |
MDPI AG
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Umfang: | 695 |
ISSN: |
2073-4344 |
DOI: | 10.3390/catal9080695 |
Zusammenfassung: | <jats:p>MoS2/C3N4 (MS-CN) composite photocatalysts have been synthesized by three different methods, i.e., in situ-photodeposition, sonochemical, and thermal decomposition. The crystal structure, optical properties, chemical composition, microstructure, and electron transfer properties were investigated by X-ray diffraction, UV-vis diffuse reflectance spectroyscopy, X-ray photoelectron spectroscopy, electron microscopy, photoluminescence, and in situ electron paramagnetic resonance spectroscopy. During photodeposition, the 2H MoS2 phase was formed upon reduction of [MoS4]2− by photogenerated conduction band electrons and then deposited on the surface of CN. A thin crystalline layer of 2H MoS2 formed an intimate interfacial contact with CN that favors charge separation and enhances the photocatalytic activity. The 2H MS-CN phase showed the highest photocatalytic H2 evolution rate (2342 μmol h−1 g−1, 25 mg catalyst/reaction) under UV-vis light irradiation in the presence of lactic acid as sacrificial reagent and Pt as cocatalyst.</jats:p> |
Format: | E-Article |
Quelle: | MDPI AG (CrossRef) |
Sprache: | Englisch |