Journal
ACS CATALYSIS
Volume 6, Issue 10, Pages 7188-7196Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b01561
Keywords
photocatalyst sheet; water splitting; Z-scheme; visible light; oxynitride
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- development of Environmental Technology using Nanotechnology from the 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]
- [23000009]
- [15H05494]
- Grants-in-Aid for Scientific Research [24107004, 16H02417, 16K06862, 15H05494] Funding Source: KAKEN
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-Scheme water splitting by photocatalyst sheets is a promising approach for efficient and scalable H-2 production. One of the most important challenges in developing such photocatalyst sheets is the application of photocatalysts with long absorption edges. In this study, RhCrOx-loaded LaMg1/3Ta2/3O2N (RhCrOx/LaMg1/3Ta2/3O2N) and Mo-doped BiVO4 (BiVO4:Mo), with absorption edges at 600 and 540 nm, are investigated as the hydrogen evolution photocatalyst and oxygen evolution photocatalyst in photocatalyst sheets, respectively. The (RhCrOx/LaMg1/3Ta2/3O2N)/Au/BiVO4:Mo sheet exhibits water splitting activity that is times higher than that of corresponding powder suspensions. Stable water splitting is achieved under visible light using the (RhCrOx/LaMg1/3Ta2/3O2N)/Au/BiVO4:Mo sheet coated with an amorphous TiO2 protective layer. However, the results show the low H-2 evolution activity of the RhCrOx/LaMg1/3Ta2/3O2N imposes a ceiling on the activity of the 'photocatalyst sheet. The surface modification of LaMg1/3Ta2/3O2N with ZrO2 effectively enhances its H-2 evolution activity by reducing the density of defects on the surface of LaMg1/3Ta2/3O2N. Accordingly, the activity of the photocatalyst sheet is almost doubled when ZrO2-modified LaMg1/3Ta2/3O2N is used. The solar-to-hydrogen energy conversion efficiency is still low (1 X 10(-3)%), although this work expands the possibility for the development of photocatalyst sheets capable of functioning under irradiation by long-wavelength photons.
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