Constructing Anatase TiO2 Nanosheets with Exposed (001) Facets/Layered MoS2 Two-Dimensional Nanojunctions for Enhanced Solar Hydrogen Generation

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• 作者：Yong-Jun Yuan ; Zhi-Jun Ye ; Hong-Wei Lu ; Bin Hu ; Yong-Hui Li ; Da-Qin Chen ; Jia-Song Zhong ; Zhen-Tao Yu ; Zhi-Gang Zou
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：February 5, 2016
• 年：2016
• 卷：6
• 期：2
• 页码：532-541
• 全文大小：708K
• ISSN：2155-5435

文摘

Cocatalysts have been extensively used to accelerate the rate of hydrogen evolution in semiconductor-based photocatalytic systems, but the influence of interface state between semiconductor and cocatalyst has been rarely investigated. Here, we demonstrate a feasible strategy of two-dimensional (2D) nanojuctions to enhance solar hydrogen generation of the MoS₂/TiO₂ system. Loading of 2D MoS₂ nanosheets on the surface of 2D anatase TiO₂ nanosheets with exposed (001) facets greatly increases the interfacial contact. At an optimal ratio of 0.50 wt % MoS₂, the 2D-2D MoS₂/TiO₂ photocatalyst shows the highest H₂ evolution rate of 2145 μmol h^–1 g^–1, which is almost 36.4 times higher than that of pure TiO₂ nanosheets. The apparent quantum yield of hydrogen evolution system reaches 6.4% at 360 nm. More importantly, the 2D-2D MoS₂/TiO₂ composite exhibits photocatalytic activity much higher than those of noble metal (such as Pt, Rh, Ru, Pd, and Au) loaded TiO₂ photocatalysts. The decisive factor in improving the photocatalytic H₂ production activity is an intimate and large contact interface between the light-harvesting semiconductor and cocatalyst. The effective charge transfer from TiO₂ to MoS₂ is demonstrated by the significant enhancement of photocurrent responses in 2D-2D MoS₂/TiO₂ composite electrodes. This work creates new opportunities for designing and constructing highly efficient photocatalysts by interface engineering.