Zn-Doped Fe2TiO5 Pseudobrookite-Based Photoanodes Grown by 2 Aerosol-Assisted Chemical Vapor Deposition

Miriam Regue Grino, Ibbi Ahmet, Prince Saurabh Bassi, Andrew Johnson, Sebastian Fiechter, Roel Van De Krol, Fatwa F. Abdi, Salvador Eslava

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Water splitting in photoelectrochemical cells is a 6 promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn2+ doping in their formation and performance. Undoped and Zn2+-doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS, and Mott−Schottky analysis. We find that the Zn2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn2+ doping modifies the electronic properties of the films, increases their charge carrier concentration, and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.
Original languageEnglish
Pages (from-to)12066-12077
JournalACS Applied Energy Materials
Volume3
Issue number12
Early online date20 Nov 2020
DOIs
Publication statusPublished - 28 Dec 2020

Keywords

  • TiO2
  • Brookite
  • AACVD
  • Photoanode
  • Zn-Doped

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