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Title: Influence of MoS2 on activity and stability of carbon nitride in photocatalytic hydrogen production
Authors: Sivasankaran, R.P.Rockstroh, N.Kreyenschulte, C.R.Bartling, S.Lund, H.Acharjya, A.Junge, H.Thomas, A.Brückner, A.
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Issue Date: 2019
Published in: Catalysts Vol. 9 (2019), No. 8
Publisher: Basel : MDPI AG
Abstract: 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.
Keywords: C3N4; Charge separation and transfer; Composite catalysts; MoS2; Photocatalytic hydrogen production
DDC: 540
License: CC BY 4.0 Unported
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