High efficiency water splitting photoanodes composed of nano-structured anatase-rutile TiO2 heterojunctions by pulsed-pressure MOCVD

Aleksandra J. Gardecka, Catherine Bishop, Darryl Lee, Sacha Corby, Ivan P. Parkin, Andreas Kafizas, Susan Krumdieck

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In this article, thin solid films are processed via pulsed-pressure metal organic chemical vapour deposition (PP-MOCVD) on FTO substrates over a range of processing times to produce a range of thicknesses and microstructures. The films are highly nanostructured anatase-rutile TiO2 composite films with unique single crystal dendrites. After annealing, carbon was removed, and materials showed improved water splitting activity; with IPCEs above 80% in the UV, photocurrents of ∼1.2 mA cm−2 at 1.23 VRHE at 1 sun irradiance and an extension of photoactivity into the visible range. The annealed material exhibits minimal recombination losses and IPCEs amongst the highest reported in the literature; attributed to the formation of a high surface area nanostructured material and synergetic interactions between the anatase and rutile phases.

Original languageEnglish
Pages (from-to)904-911
Number of pages8
JournalApplied Catalysis B: Environmental
Volume224
Early online date16 Nov 2017
DOIs
Publication statusPublished - May 2018

Keywords

  • Anatase-rutile heterojunctions
  • Nanostructured photoelectrodes
  • PP-MOCVD
  • Solar water splitting
  • Titanium dioxide (TiO)

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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