S‐scheme heterojunction TiO₂/CdS nanocomposite nanofiber as H₂‐production photocatalyst

Haonan GE, Feiyan XU, Bei CHENG, Jiaguo YU, Wing Kei HO

Research output: Contribution to journalArticles

35 Citations (Scopus)

Abstract

One‐dimensional (1D) nanostructured photocatalyst is a promising candidate for hydrogen (H₂) generation, which can be used to deal with the energy crisis. Herein, novel 1D TiO₂/CdS well‐hybridized nanofibers (NFs) were synthesized via in situ electrospinning method. These 1D hybrid NFs showed a high H₂‐production rate of 2.32 mmol h⁻¹ g⁻¹ with an apparent quantum efficiency of 10.14 %, which was 35‐fold higher than that of pristine TiO₂ NFs. X‐ray photoelectron spectroscopy (XPS) analysis and density functional theory calculation implied that the electrons transferred from CdS to TiO₂ upon hybridization and created an internal electric field (IEF) pointing from CdS to TiO₂. This IEF drove the photoexcited electrons in TiO₂ to transfer toward CdS upon light irradiation as revealed by in situ irradiated XPS analysis, suggesting that a step‐scheme (S‐scheme) heterojunction was formed in the TiO₂/CdS nanohybrids and greatly promoted the separation of electron‐hole pairs to foster efficient H₂ photogeneration. The significant enhancement of photocatalytic activity was also benefited from the easy transfer for electrons in the 1D well‐distributed nanostructure of nanohybrids. This work presents a method for in situ preparing well‐distributed 1D NFs with high photocatalytic activity for H₂ production via the S‐scheme pathways. Copyright © 2019 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)6301-6309
JournalChemCatChem
Volume11
Issue number24
Early online dateSep 2019
DOIs
Publication statusPublished - Dec 2019

Citation

Ge, H., Xu, F., Cheng, B., Yu, J., & Ho, W. (2019). S‐scheme heterojunction TiO₂/CdS nanocomposite nanofiber as H₂‐production photocatalyst. ChemCatChem, 11(24), 6301-6309. doi: 10.1002/cctc.201901486

Keywords

  • TiO₂/CdS composite nanofibers
  • Step-scheme heterojunction
  • Photocatalysis
  • H₂ production
  • S-scheme mechanism

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