Journal
JOULE
Volume 2, Issue 3, Pages 509-520Publisher
CELL PRESS
DOI: 10.1016/j.joule.2017.12.009
Keywords
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Funding
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO) from the Japan Society for the Promotion of Science (JSPS)
- Japan Society for the Promotion of Science (JSPS) [16H02417, 16K06862, 15H05494, 16K17944]
- Grants-in-Aid for Scientific Research [16K06862, 17H01216, 15H05494, 16K17944] Funding Source: KAKEN
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Sunlight-driven photocatalytic water splitting has been investigated as a potentially scalable and economically feasible means of producing renewable hydrogen. However, reactors suitable for efficient water splitting and prompt collection of gaseous products on a large scale have yet to be demonstrated. Here, we demonstrate a sunlight-powered water-splitting reactor using a fixed Al-doped SrTiO3 photocatalyst and address the key issues in the reactor design associated with the scale-up. A panel reactor filled with only a 1-mm-deep layer of water was capable of rapid release of product gas bubbles without forced convection. A flat panel reactor with 1 m(2) of light-accepting area retained the intrinsic activity of the photocatalyst and achieved a solar-to-hydrogen energy conversion efficiency of 0.4% by water splitting under natural sunlight irradiation. The concept of a readily extensible water-splitting panel is a viable means for large-scale production of low-cost renewable solar hydrogen.
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