Fabrication of 1D/2D CdS/CoS_x direct Z-scheme photocatalyst with enhanced photocatalytic hydrogen evolution performance

摘要

In this work, we fabricate a 1D/2D heterojunction photocatalyst composed of n-type CdS nanorods and p-type CoSx nanoflake. This photocatalyst achieves a hydrogen evolution rate of 9.47 mmol g(-1) h(-1), which is 13.7 times higher than that of pure CdS nanorods. Scanning Kelvin Probe, Mott-Schottky plots, UV-Vis absorption spectra and surface photo carrier orienting reaction results indicate that the enhanced photocatalytic performance of CdS/CoSx is owing to the fabrication of direct Z-Scheme heterojunction system which greatly improves the utilization, migration and separation rate of photo-generated carriers. To the best of our knowledge, this work is the first time to describe a CdS/CoSx direct Z-scheme system with 1D/2D nanostructure, which can expedite the transfer process of photo generated carriers with strong redox energy to participate in photocatalytic reactions. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.