Double Z-Scheme Construction in Mose2/Cdse Co-Modified Tio2 Nanotubes for Efficient Photocatalysis

Abstract

Efficient carrier separation is a vital factor determining photocatalytic performance, and introducing built-in electric field within heterojunction is regarded as a robust strategy for promoting carrier separation. Herein, a subtle double Z-scheme heterojunction is rationally designed based on MoSe2/CdSe co-modified TiO2 nanotube arrays through a facile solvothermal method, which exhibits boosted organic pollution degradation, heavy metal ion elimination and hydrogen evolution rates. Specifically, nearly 100% of methylene blue and 90.11% of rhodamine B are degraded, 85.47% of Cr(VI) is reduced, and a high hydrogen evolution rate of 172.63 μmol·h-1·cm-2 is achieved over the constructed double Z-scheme heterogeneous structure. Significantly, photovoltage, photocurrent and photoluminescence characterizations corroborate that the constructed double Z-scheme heterostructure is beneficial for facilitating carrier separation and transfer behavior, thereby greatly improving photocatalytic performance. This work would provide guidance to those working in photocatalyst structure design and photocatalytic applications in wastewater treatment and hydrogen generation.

Keywords: photocatalysis, carrier separation, double Z-scheme, heterojunction