Vertical 1T/2H-WS 2 nanoflakes grown on 2D-C 3 N 4 : Multiple charge transfer channels designed for enhanced photocatalytic activity

• Published in: Journal of colloid and interface science Vol. 556; p. 224
• Main Authors: Huang, Jing, Mei, Junwei, Han, Jianxin, Liang, Hui, Wang, Wei, Dong, Bohua, Cao, Lixin
• Format: Journal Article
• Language: English
• Published: United States 12-08-2019
• Subjects: Multiple; 2D-CN; H production; Colloidal; 1T/2H-WS
• ISSN: 1095-7103

Two-dimensional (2D) sulfides have attracted much attention as a promising photocatalyst for the hydrogen evolution reaction. In this work, a highly active and stable vertical 1T/2H-WS
nanoflakes grown on 2D-C
N
with multiple charge transfer channels through a simple and efficient colloidal strategy is reported. This three-dimensional (3D) composite presents the usual semiconducting 2H phase WS
as well as the unusual distorted octahedral 1T phase WS
, which vertically connect 2D-C
N
constructing an interesting 3D structure with more active sites. The H
production rate of the optimal product has reached 350.75 μmol·g
·h
, which is 66.8 and 8.2 times higher than the rate of 2D-C
N
and 1T/2H-WS
respectively. The predominant charge transfer occurs between 2D-C
N
and 2H-WS
nanoflakes due to their vertical connection and the matched energy structure while the existence of the metallic 1T-WS
acts as a cocatalyst with an enhanced conductivity to provide multiple charge transfer channels over its basal and edge sites for H
reduction.