Construction of 2D‐ZnS@ZnO Z‐Scheme Heterostructured Nanosheets with a Highly Ordered ZnO Core and Disordered ZnS Shell for Enhancing Photocatalytic Hydrogen Evolution,ChemNanoMat

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Construction of 2D‐ZnS@ZnO Z‐Scheme Heterostructured Nanosheets with a Highly Ordered ZnO Core and Disordered ZnS Shell for Enhancing Photocatalytic Hydrogen Evolution
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-02-03 , DOI: 10.1002/cnma.201900630
Qingrui Luan ₁ , Qifeng Chen ₁ , Jie Zheng ₁ , Ruifang Guan ₁ , Yanfen Fang ₂ , Xun Hu ₁

Affiliation

Heterostructure and defects in photocatalyst play highly important role in photocatalysis. Formation of 2D‐ZnS@ZnO Z‐scheme heterostructure and introduction of zinc interstitial defects into ZnO were successfully achieved through a facile in‐situ ion‐exchange hydrothermal approach, and the photocatalysts exhibited high photocatalytic activity for hydrogen evolution. The heterointerface between the highly ordered ZnO core and disordered ZnS shell, and the zinc interstitial, facilitate the transfer and separation of charge carriers, resulting in high photocatalytic activity. The 2D‐ZnS@ZnO photocatalyst with a disordered ZnS layer of about 8 nm in thickness exhibited a photocurrent density about 7.2 times than that of ZnO, which is mainly attributed to the facilitative effect on interface transfer and the increased charge density. In addition, the photocatalytic activity can be adjusted via changing the thickness of the disordered ZnS overlayer. This work provides a strategy for the design of the heterointerface photocatalysts combined with defect engineering, through which the photocatalytic activity can be remarkably improved.

中文翻译：

具有高序ZnO核和无序ZnS壳的2D-ZnS @ ZnO Z方案异质结构纳米片的构建，以增强光催化氢的释放

光催化剂的异质结构和缺陷在光催化中起着非常重要的作用。通过一种简便的原位离子交换水热方法成功地实现了2D-ZnS @ ZnO Z型异质结构的形成以及将锌间隙缺陷引入到ZnO中，并且光催化剂显示出高的光催化活性以释放氢。高度有序的ZnO核与无序的ZnS壳之间的异质界面以及锌间隙，有利于电荷载流子的转移和分离，从而具有很高的光催化活性。ZnS无序层厚度约为8 nm的2D-ZnS @ ZnO光催化剂的光电流密度是ZnO的7.2倍，这主要归因于对界面转移的促进作用和电荷密度的增加。此外，可以通过改变无序ZnS覆盖层的厚度来调节光催化活性。这项工作提供了结合缺陷工程设计异质界面光催化剂的策略，通过该策略可以显着提高光催化活性。

更新日期：2020-02-03

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