Journal
APPLIED CATALYSIS A-GENERAL
Volume 521, Issue -, Pages 26-33Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2015.10.034
Keywords
Z-scheme; Water splitting; Photocatalyst sheet; Protective layer; Oxynitride
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [23000009, 15H05494]
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [12024046]
- China Scholarship Council (CSC) [201306160079]
- Grants-in-Aid for Scientific Research [15H05494, 16H02417, 23000009] Funding Source: KAKEN
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Z-scheme water splitting systems are suited for photocatalysts with long absorption edge wavelengths because H-2 and O-2 evolution reactions occur on different photocatalysts via two-step excitation. In this study, the applicability of LaMg1/3Ta2/3O2N, a 600-nm-class photocatalyst, as a H-2 evolution photocatalyst (HEP) in Z-scheme systems was investigated. The redox-mediator-free Z-scheme system composed of RhCrOx/LaMg1/3Ta2/3O2N as a HEP and rutile as an O-2 evolution photocatalyst (OEP) showed higher activity than one-step excitation systems of RhCrOx/LaMg1/3Ta2/3O2N or rutile alone under irradiation (l ?300 nm). Moreover, a photocatalyst sheet, which consisted of RhCrOx/LaMg1/3Ta2/3O2N and rutile embedded in a Au layer by the particle transfer method, exhibited a photocatalytic activity one order of magnitude higher than the Z-scheme powder suspension system, although LaMg1/3Ta2/3O2N suffered from self-oxidation. Coating the photocatalyst sheet with an amorphous titanium oxide (a-TiO2) protective layer suppressed the self-oxidation of LaMg1/3Ta2/3O2N effectively while maintaining a high photocatalytic activity. This is because the overlying a-TiO2 layer stabilized LaMg1/3Ta2/3O2N while the underlying Au layer transferred charges between RhCrOx/LaMg1/3Ta2/3O2N and rutile effectively. The present study demonstrates the feasibility of the use of LaMg1/3Ta2/3O2N in Z-scheme systems as a HEP with a long absorption edge wavelength and provides a facile approach to stabilizing oxynitrides in photocatalyst sheet systems. (C) 2015 Elsevier B.V. All rights reserved.
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