Photocatalytic Stability of Single- and Few-Layer MoS2

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• 作者：Eric Parzinger ; Bastian Miller ; Benno Blaschke ; Jose A. Garrido ; Joel W. Ager ; Alexander Holleitner ; Ursula Wurstbauer
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：November 24, 2015
• 年：2015
• 卷：9
• 期：11
• 页码：11302-11309
• 全文大小：499K
• ISSN：1936-086X

文摘

MoS₂ crystals exhibit excellent catalytic properties and great potential for photocatalytic production of solar fuels such as hydrogen gas. In this regard, the photocatalytic stability of exfoliated single- and few-layer MoS₂ immersed in water is investigated by 渭-Raman spectroscopy. We find that while the basal plane of MoS₂ can be treated as stable under photocatalytic conditions, the edge sites and presumably also defect sites are highly affected by a photoinduced corrosion process. The edge sites of MoS₂ monolayers are significantly more resistant to photocatalytic degradation compared to MoS₂ multilayer edge sites. The photostability of MoS₂ edge sites depends on the photon energy with respect to the band gap in MoS₂ and also on the presence of oxygen in the electrolyte. These findings are interpreted in the framework of an oxidation process converting MoS₂ into MoO_x in the presence of oxygen and photoinduced charge carriers. The high stability of the MoS₂ basal plane under photocatalytic treatment under visible light irradiation of extreme light intensities on the order of P 鈮?10 mW/渭m² substantiates MoS₂鈥檚 potential as photocatalyst for solar hydrogen production.