Alkali Metal Chloride Flux Growth of Ilmenite-Type ZnTiO3 and Subsequent Nitrogen Doping for Visible-Light-Driven Water Oxidation Catalysis

Hajime Wagata, Kenta Sakakibara, Kenta Kawashima, Mirabbos Hojamberdiev, Kunio Yubuta, Katsuya Teshima

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The polyhedral-shaped ilmenite-type ZnTiO3 crystals with well-developed facets were grown from alkali metal chloride fluxes (ACl, A = Li, Na, K, Rb, and Cs). NaCl and CsCl were observed to be the most suitable fluxes for growing ilmenite-type ZnTiO3 crystals without impurity phases. Doping nitrogen into the crystals was achieved via heating under the continuous flow of ammonia gas (NH3). The resulting crystals exhibited enhanced photon harvesting capacity while still maintaining their original crystal phase (i.e., ZnTiO3). The introduction of nitrogen into the lattice was confirmed through analytical techniques used for investigating the surface chemical states and bulk chemical compositions. The N-doped ZnTiO3 served as a competent photocatalyst for water oxidations in AgNO3 aqueous solutions under visible light irradiation.

Original languageEnglish
Pages (from-to)7762-7771
Number of pages10
JournalACS Applied Energy Materials
Volume2
Issue number11
DOIs
Publication statusPublished - 2019 Nov 25

Keywords

  • ZnTiO
  • alkali metal chloride flux
  • flux method
  • nitrogen doping
  • visible-light-driven photocatalyst

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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