Issue 22, 2019

Oxygen deficiency introduced to Z-scheme CdS/WO3−x nanomaterials with MoS2 as the cocatalyst towards enhancing visible-light-driven hydrogen evolution

Abstract

An oxygen deficiency modified Z-scheme CdS/WO3−x nanohybrid with MoS2 as the cocatalyst was synthesized by a microwave hydrothermal method and was used for photocatalytic hydrogen production under visible light irradiation. Loadings of WO3−x and MoS2 as well as the synthesis time of the microwave-assisted hydrothermal process were optimized, and the physicochemical and optical properties of the as-prepared photocatalysts were characterized by various techniques. Results showed that the material with 30 wt% of WO3−x, 0.1 wt% of MoS2 and a preparation time of 120 minutes exhibited the most desirable morphology and structure for hydrogen production. The maximum hydrogen production of 2852.5 μmol g−1 h−1 was achieved, which was 5.5 times that of pure CdS (519.1 μmol g−1 h−1) and 1.5 times that of CdS/30 wt% WO3−x (1879.0 μmol g−1 h−1), and the external quantum efficiency (EQE) reached 10.0% at 420 nm. The improvement of photocatalytic performance could be attributed to the Z-scheme formed between CdS and WO3−x and MoS2 as an electron trap. It is worth mentioning that the size of the composite had a negative correlation with the H2 production rate.

Graphical abstract: Oxygen deficiency introduced to Z-scheme CdS/WO3−x nanomaterials with MoS2 as the cocatalyst towards enhancing visible-light-driven hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
19 Dec 2018
Accepted
01 May 2019
First published
01 May 2019

Nanoscale, 2019,11, 10884-10895

Oxygen deficiency introduced to Z-scheme CdS/WO3−x nanomaterials with MoS2 as the cocatalyst towards enhancing visible-light-driven hydrogen evolution

F. Li, Y. Hou, Z. Yu, L. Qian, L. Sun, J. Huang, Q. Ran, R. Jiang, Q. Sun and H. Zhang, Nanoscale, 2019, 11, 10884 DOI: 10.1039/C8NR10230A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements