Vertical single or few-layer MoS2 nanosheets rooting into TiO2 nanofibers for highly efficient photocatalytic hydrogen evolution
Vertical single or few-layer MoS2 nanosheets rooting into TiO2 nanofibers for highly efficient photocatalytic hydrogen evolution
复制标题
垂直单层或多层 MoS2 纳米片扎根于 TiO2 纳米纤维，实现高效光催化析氢
DOI：
10.1016/j.apcatb.2014.08.046
复制
发表时间：
2015-03-01
影响因子：
22.1
通讯作者：
Xu, Yuzi
中科院分区：
文献类型：
--
作者：
Liu, Chengbin;Wang, Longlu;Xu, Yuzi
硫化钼（MoS2）对析氢反应（HER）的催化活性很大程度上取决于MoS2纳米片暴露的活性边的数量。将单层或多层MoS2纳米片垂直放置在衬底上是最大限度地暴露MoS2纳米片边缘位置的一种非常有效的方法。通过简单的水热反应，成功地在多孔TiO2纳米纤维（TiO2@MoS2）上制备了垂直站立的单层或多层MoS2纳米片。由于静电纺丝的TiO2纳米纤维中有大量的孔隙，MoS2纳米片由内向外垂直生长，MoS2纳米片扎根于TiO2纳米纤维中的生长方式不仅使TiO2与MoS2紧密接触以实现快速电子转移，而且使TiO2@MoS2异质结构具有较高的结构稳定性。二硫化钼纳米片的垂直取向使得二硫化钼的活性边缘位点得到最大限度的暴露。在不使用Pt助催化剂的情况下，TiO2@MoS2异质结构在紫外-可见或可见光照射下的光催化产氢率分别为1.68或0.49 mmol h(-1) g（-1）。这种高光催化活性源于这种新型异质结构中MoS2和TiO2组分之间的正协同作用。此外，TiO2@MoS2异质结构具有较高的耐久性，连续光照30 h后产氢速率不变。该工作促进了高效硫化钼基HER催化剂的开发。(C) 2014 Elsevier B.V.版权所有
The catalytic activity of molybdenum sulfide (MoS2) for hydrogen evolution reaction (HER) strongly depends on the number of exposed active edges of MoS2 nanosheets. Making single or few-layer MoS2 nanosheets vertically stand on a substrate is a very effective way to maximally expose the edge sites of MoS2 nanosheets. Vertically standing single or few-layer MoS2 nanosheets on porous TiO2 nanofibers (TiO2@MoS2) are successfully prepared via a simple hydrothermal reaction. Due to plenty of pores in the electrospun TiO2 nanofibers, the MoS2 nanosheets vertically grow from the inside to the outside, and the growth mode of the MoS2 nanosheets rooting into the TiO2 nanofibers endows not only intimate contact between TiO2 and MoS2 for fast electrons transfer but also high structural stability of TiO2@MoS2 heterostructure. The vertical orientation of MoS2 nanosheets enables the active edge sites of MoS2 to be maximally exposed. Without using Pt cocatalyst, the TiO2@MoS2 heterostructure achieves high photocatalytic hydrogen production rates of 1.68 or 0.49 mmol h(-1) g(-1) under UV-vis or visible light illumination, respectively. This high photocatalytic activity arises from the positive synergetic effect between the MoS2 and TiO2 components in this novel heterostructure. In addition, the TiO2@MoS2 heterostructure exhibits a high durability as evidenced by the invariable hydrogen production rate after continuous illumination over 30 h. The work advances the development of highly efficient molybdenum sulfide-based HER catalysts. (C) 2014 Elsevier B.V. All rights reserved.