Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting

Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, Satoshi Hinokuma, Shintaro Ida, Tatsumi Ishihara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Effects of nitridation condition on gallium-zinc oxynitride solid solution (GaN:ZnO) was investigated to optimize the composition of GaN:ZnO for dye-modified photocatalysts. Gallium nitride (GaN) formed from Ga2O3 at 973 K, and GaN:ZnO was obtained over 1073 K under NH3 gas flow. Nitrogen content in GaN:ZnO increased with increasing nitridation temperature and time, while zinc content decreased because of evaporation. Although UV–vis absorption spectra of GaN:ZnO powders were not significantly changed in different compositions, the water splitting activities of the dye-modified GaN:ZnO photocatalysts depended on the composition of GaN:ZnO. The highest formation rates of H2 and O2 were achieved by the GaN:ZnO containing 15% of zinc and 73% of nitrogen. Finally, the nitridation condition was optimized at 1123 K 15 h under NH3 gas flow (200 ml/min) for preparation of the dye-modified GaN:ZnO powder as water splitting photocatalyst.

Original languageEnglish
Pages (from-to)601-606
Number of pages6
JournalSurface and Coatings Technology
Volume324
DOIs
Publication statusPublished - Sep 15 2017

Fingerprint

Gallium nitride
water splitting
gallium nitrides
Porphyrins
porphyrins
preparation
Water
Nitridation
Photocatalysts
Zinc
Coloring Agents
Dyes
zinc
dyes
Powders
gas flow
Flow of gases
Nitrogen
Chemical analysis
gallium nitride

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting. / Hagiwara, Hidehisa; Kakigi, Ryota; Takechi, Shuhei; Watanabe, Motonori; Hinokuma, Satoshi; Ida, Shintaro; Ishihara, Tatsumi.

In: Surface and Coatings Technology, Vol. 324, 15.09.2017, p. 601-606.

Research output: Contribution to journalArticle

Hagiwara, Hidehisa ; Kakigi, Ryota ; Takechi, Shuhei ; Watanabe, Motonori ; Hinokuma, Satoshi ; Ida, Shintaro ; Ishihara, Tatsumi. / Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting. In: Surface and Coatings Technology. 2017 ; Vol. 324. pp. 601-606.
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AU - Takechi, Shuhei

AU - Watanabe, Motonori

AU - Hinokuma, Satoshi

AU - Ida, Shintaro

AU - Ishihara, Tatsumi

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AB - Effects of nitridation condition on gallium-zinc oxynitride solid solution (GaN:ZnO) was investigated to optimize the composition of GaN:ZnO for dye-modified photocatalysts. Gallium nitride (GaN) formed from Ga2O3 at 973 K, and GaN:ZnO was obtained over 1073 K under NH3 gas flow. Nitrogen content in GaN:ZnO increased with increasing nitridation temperature and time, while zinc content decreased because of evaporation. Although UV–vis absorption spectra of GaN:ZnO powders were not significantly changed in different compositions, the water splitting activities of the dye-modified GaN:ZnO photocatalysts depended on the composition of GaN:ZnO. The highest formation rates of H2 and O2 were achieved by the GaN:ZnO containing 15% of zinc and 73% of nitrogen. Finally, the nitridation condition was optimized at 1123 K 15 h under NH3 gas flow (200 ml/min) for preparation of the dye-modified GaN:ZnO powder as water splitting photocatalyst.

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