10.1007/s40097-020-00373-7

Horizontally growth of WS2/WO3 heterostructures on crystalline g-C3N4 nanosheets towards enhanced photo/electrochemical performance

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  • Xiao Zhang1,
  • Ping Yang2,
  • San Ping Jiang*1,
  1. Fuels and Energy Technology Institute and WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA6845, AU
  2. School of Material Science and Engineering, University of Jinan, Jinan, 250022, CN

Published in Issue 03-01-2021

How to Cite

Zhang, X., Yang, P., & Jiang, S. P. (2021). Horizontally growth of WS2/WO3 heterostructures on crystalline g-C3N4 nanosheets towards enhanced photo/electrochemical performance. Journal of Nanostructure in Chemistry, 11(3 (September 2021). https://doi.org/10.1007/s40097-020-00373-7
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Abstract

Abstract Two-dimensional carbon-based material is attracting considerable attention in exploiting photocatalyst under visible light for photocatalytic energy conversion and storage field, e.g., photocatalytic H 2 production, and photodegradation. Here, WS 2 /WO 3 composites are grown on crystalline graphitic carbon nitride (g-C 3 N 4 ) nanosheets to form heterostructures using a hydrothermal treatment method. While the composition of WS 2 /WO 3 depends on the preparation conditions, the ratio of WS 2 /WO 3 affects the photocatalytic performance of samples. WS 2 /g-C 3 N 4 heterostructures prepared with addition of ascorbic acid reveal enhanced photocatalytic activity due to efficient separation of photogenerated charge carriers. In contrast, sample with relatively low-WS 2 proportion reveals high-H 2 generation performance under visible-light irradiation. Under full solar spectrum irradiation, the average H 2 evolution rate of sample is increased by 5.7 times comparing with that under visible-light test condition. The electrochemical performance of WS 2 /WO 3 /g-C 3 N 4 heterostructures was studied using g-C 3 N 4 with different crystallinity for comparison. With fixed WS 2 /WO 3 /g-C 3 N 4 ratio, crystalline g-C 3 N 4 leads to improved photocatalytic activity of WS 2 /WO 3 /g-C 3 N 4 heterostructures. Sample using g-C 3 N 4 with the highest crystallinity (prepared at 750 ℃) has the highest photodegradation rate and photocurrent response rate comparing with the samples prepared using low-crystalline g-C 3 N 4 substrate. Graphical abstract

Keywords

  • g-C3N4,
  • WS2–WO3,
  • Photocatalysis,
  • Electrochemistry,
  • H2 evolution

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