Solar water oxidation by multicomponent TaON photoanodes functionalized with nickel oxide

Satnam Singh Gujral, Alexandr Simonov, Xi -Ya Fang, Masanobu Higashi, Ryu Abe, Leone Spiccia

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Efficient solar-powered water oxidation over the TaON-based anodes requires coupling this photoactive n-type semiconductor to an electrooxidation catalyst to improve the otherwise unsatisfactory activity and stability. Herein, we examine how functionalization with electrodeposited nickel oxide, NiOx, affects the performance of screen-printed TaON photoanodes post-necked with titania (TiO2–TaON). The effects of the NiOx photo-electrodeposition parameters on the microstructure and photocatalytic performance of the resulting anodes are explored. Enhancements in the transient water oxidation photocurrent densities by sixfold vs. unmodified TiO2–TaON were achieved with the use of the NiOx/TiO2–TaON photoanodes. Long-term stability tests reveal a slow but persistent degradation of the performance of the multicomponent photocatalysts under the severely oxidizing conditions of water photo-oxidation coincident with continuous morphological changes in the NiOx deposits.

Original languageEnglish
Pages (from-to)1107-1115
Number of pages9
JournalChemPlusChem
Volume81
Issue number10
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • electrodeposition
  • nickel oxide
  • tantalum oxynitride
  • water splitting

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