Single-Step Preparation of Large Area TiO2 Photoelectrodes for Water Splitting

Silvia Franz, Hamed Arab, Gian Luca Chiarello, Massimiliano Bestetti, Elena Selli

Research output: Contribution to journalArticle

Abstract

The fast, single-step and easily scalable production by plasma electrolytic oxidation (PEO) of large area TiO2 electrodes with excellent photoactivity in water splitting under simulated solar light is systematically investigated here. In particular, the effects that the cell voltage (100–180 V) and the processing time (0.5–15 min) have on the electrode properties are studied. The PEO-produced oxide layers are porous, the predominant crystalline structure shifting from anatase, to an anatase-rutile mixture, and finally to rutile by rising the cell voltage. The electrodes show a double-layered structure, with a more compact layer at the interface with the titanium substrate and a thick porous layer on the external surface. The photocurrent density versus wavelength reflects the phase composition, with a maximum incident photon-to-current efficiency of 90% at 320 nm. The highest H2 production rate is attained with the mixed anatase-rutile electrode prepared by 300 s-long PEO at 150 V.

Original languageEnglish
Article number2000652
JournalAdvanced Energy Materials
Volume10
Issue number23
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • photocatalytic water splitting
  • photoelectrochemical cells
  • plasma electrolytic oxidation
  • thin films
  • TiO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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