Journal
NATURE MATERIALS
Volume 15, Issue 6, Pages 611-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4589
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Funding
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- A3 Foresight Program of Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Development of Environmental Technology using Nanotechnology from Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Office of Science of the US Department of Energy [DE-SC0004993]
- [23000009]
- [15H05494]
- Grants-in-Aid for Scientific Research [15H05494, 23000009, 16H02417, 24107004] Funding Source: KAKEN
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Photocatalytic water splitting using particulate semiconductors is a potentially scalable and economically feasible technology for converting solar energy into hydrogen(1-3). Z-scheme systems based on two-step photoexcitation of a hydrogen evolution photocatalyst (HEP) and an oxygen evolution photocatalyst (OEP) are suited to harvesting of sunlight because semiconductors with either water reduction or oxidation activity can be applied to the water splitting reaction(4,5). However, it is challenging to achieve efficient transfer of electrons between HEP and OEP particles(6,7). Here, we present photocatalyst sheets based on La-and Rh-codoped SrTiO3 (SrTiO3:La, Rh; ref. 8) and Mo-doped BiVO4 (BiVO4:Mo) powders embedded into a gold (Au) layer. Enhancement of the electron relay by annealing and suppression of undesirable reactions through surface modification allow pure water (pH 6.8) splitting with a solar-to-hydrogen energy conversion efficiency of 1.1% and an apparent quantum yield of over 30% at 419 nm. The photocatalyst sheet design enables efficient and scalable water splitting using particulate semiconductors.
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