Enhanced photocatalytic H₂ production performance of CdS hollow spheres using C and Pt as bi-cocatalysts

Shipeng TANG, Yang XIA, Jiajie FAN, Bei CHENG, Jiaguo YU, Wing Kei HO

Research output: Contribution to journalArticlespeer-review

4 Citations (Scopus)

Abstract

Photocatalytic H₂ production from water splitting is an effective method to solve energy crisis and environmental pollution simultaneously. Herein, carbon@CdS composite hollow spheres (C@CdS-HS) are fabricated via a facile hydrothermal method using porous carbon hollow spheres (C-HS) as the template. The C@CdS-HS shows an excellent photocatalytic H2-generation rate of 20.9 mmol h⁻¹ g⁻¹ (apparent quantum efficiency of 15.3% at 420 nm), with 1.0 wt% Pt as a cocatalyst under simulated sunlight irradiation; this rate is 69.7, 13.9, and 3.9 times higher than that obtained with pure CdS hollow spheres (CdS-HS), C@CdS-HS, and CdS-HS/Pt, respectively. The enhanced photocatalytic H₂-evolution activity of C@CdS-HS/Pt is due to the synergistic effect of C and Pt as the bi-cocatalyst. The C-HS serves not only as an active site provider but also as an electron transporter and reservoir. Moreover, C-HS has a strong photothermal effect that is induced by near infrared light, which kinetically accelerates the H₂-production reaction. Additionally, the underlying charge transfer pathway and process from CdS to C−HS is revealed. This work highlights the potential application of C-HS-based nanocomposites in solar-to-chemical energy conversion. Copyright © 2021 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences.
Original languageEnglish
Pages (from-to)743-752
JournalChinese Journal of Catalysis
Volume42
Issue number5
Early online date30 Mar 2021
DOIs
Publication statusPublished - May 2021

Citation

Tang, S., Xia, Y., Fan, J., Cheng, B., Yu, J., & Ho, W. (2021). Enhanced photocatalytic H₂ production performance of CdS hollow spheres using C and Pt as bi-cocatalysts. Chinese Journal of Catalysis, 42(5), 743-752. doi: 10.1016/S1872-2067(20)63695-6

Keywords

  • CdS hollow sphere
  • Carbon
  • Platinum
  • Bi-cocatalyst
  • Synergistic effect
  • Photocatalytic hydrogen production

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