Porous Fe2O3 nanotubes with Α-Γ phase junction for enhanced charge separation and photocatalytic property produced by molecular layer deposition

Chaoqiu Chen, Feifei Duan, Shichao Zhao, Weike Wang, Fan Yang, Wiwat Nuansing, Baiyan Zhang, Yong Qin, Mato Knez

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Constructing nanotubular morphologies and heterojunctions are two effective strategies to enhance the charge separation and transport of α-Fe2O3 for improved photocatalytic performance, while the fabrication of porous α-Fe2O3 nanotubes with precisely tailored wall thickness, pore structure, crystallinity, and junctions still remains a big challenge. Herein, two novel molecular layer deposition (MLD) procedures are designed to prepare porous Fe2O3 nanotubes with tunable pore structure and phase junction. The organic fractions of the obtained Fe-hybrid MLD films not only act as soft templates to generate nanopores in nanotube walls but also play a key role in the formation of phase-junction. The porous structure and phase-junction significantly improve the mass diffusion and charge separation efficiency of Fe2O3 nanotubes, leading to a drastically increased photocatalytic activity for photo-Fenton reaction. Especially, the porous α-γ Fe2O3 nanotubes produced by two-step AB MLD from iron tert-butoxide and ethylene glycol exhibit the highest photocatalytic activity, which is more than a 6.5-fold and 20-fold improvement compared with the nonporous pure α-Fe2O3 nanotubes and commercial α-Fe2O3 nanoparticles, respectively. The MLD method provides a new bottom-up approach to develop efficient Fe2O3 based heterostructure porous photocatalysts for waste-water cleaning and water splitting.

Original languageEnglish
Pages (from-to)218-225
Number of pages8
JournalApplied Catalysis B: Environmental
Volume248
DOIs
StatePublished - 5 Jul 2019
Externally publishedYes

Keywords

  • Charge separation
  • Molecular layer deposition
  • Nanoporous hematite nanotubes
  • Phase junction
  • Photo-Fenton reaction

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