Role of SnS2 in 2D-2D SnS2/TiO2 Nanosheet Heterojunctions for Photocatalytic Hydrogen Evolution
Role of SnS2 in 2D-2D SnS2/TiO2 Nanosheet Heterojunctions for Photocatalytic Hydrogen Evolution
复制标题
SnS2 在 2D-2D SnS2/TiO2 纳米片异质结光催化析氢中的作用
DOI：
10.1021/acsanm.9b00122
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发表时间：
2019
影响因子：
5.9
通讯作者：
Huang Liang
中科院分区：
文献类型：
--
作者：
Sun Linqiang;Zhao Zhicheng;Li Shun;Su Yiping;Huang Liang
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Constructing heterojunctions with face-to-face interface is a new avenue for accelerating the charge separation in semiconductor photocatalysts toward highly efficient solar water splitting systems. Here, a novel SnS2/TiO22D–2D ultrathin nanosheet heterostructure was fabricated via a hydrothermal route in two steps. The obtained 2D–2D SnS2/TiO2nanojunction has not only provided large contact areas but also shortened the charge transport distance, resulting in significantly enhanced photocatalytic H2evolution property. The H2generation rate obtained for the optimized sample reaches 652.4 μmol h–1g–1, far exceeding (∼8 times) that of pristine TiO2and SnS2ultrathin nanosheets under simulated solar irradiation. Moreover, further analysis reveals a photoinduced carrier transfer from TiO2to SnS2at the interface junction, which causes a partial reduction of the SnS2cocatalyst to SnS in the nanocomposite during the photocatalytic reactions. These results not only demonstrate that the construction of 2D–2D heterojunction is a promising approach to improve the photocatalytic H2production activity of nanostructured semiconductor photocatalysts but also provide new understanding into the role and evolution of SnS2nanosheets during the photocatalytic reaction process in heterogeneous photocatalyst systems.