TY - JOUR
T1 - Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting
AU - Hagiwara, Hidehisa
AU - Kakigi, Ryota
AU - Takechi, Shuhei
AU - Watanabe, Motonori
AU - Hinokuma, Satoshi
AU - Ida, Shintaro
AU - Ishihara, Tatsumi
N1 - Funding Information:
Part of this work has been financially supported by (No. 16H06293) from the Ministry of Education, Culture, Sports, Science and Technology.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/9/15
Y1 - 2017/9/15
N2 - 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.
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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U2 - 10.1016/j.surfcoat.2016.10.054
DO - 10.1016/j.surfcoat.2016.10.054
M3 - Article
AN - SCOPUS:85005950206
SN - 0257-8972
VL - 324
SP - 601
EP - 606
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -
