Journal
SCIENCE ADVANCES
Volume 8, Issue 32, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.adc9115
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Funding
- Mazda Foundation
- Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Energy Biosciences, Department of Energy [DE-SC0019781]
- ENEOS Hydrogen Trust Fund
- Japan Science and Technology Agency (JST) CREST program [JPMJCR20R2]
- JSPS [JP22H05148]
- [JP19H02511]
- [JP22H01862]
- [JP21K20555]
- U.S. Department of Energy (DOE) [DE-SC0019781] Funding Source: U.S. Department of Energy (DOE)
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Researchers have improved the energy conversion efficiency of solar-driven water splitting for hydrogen production by modifying metal oxides. The use of the optimized photocatalyst achieved the highest STH and apparent quantum yield.
While dye-sensitized metal oxides are good candidates as H-2 evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification of Ru dye-sensitized, Pt-intercalated HCa2Nb3O10 nanosheets (Ru/Pt/HCa2Nb3O10) with both amorphous Al2O3 and poly(styrenesulfonate) (PSS) improves the STH efficiency of Z-scheme overall water splitting by a factor of similar to 100, when the nanosheets are used in combination with a WO3-based O-2 evolution photocatalyst and an I-3(-)/I- redox mediator, relative to an analogous system that uses unmodified Ru/Pt/HCa2Nb3O10. By using the optimized photocatalyst, PSS/Ru/Al2O3/ Pt/HCa2Nb3O10, a maximum STH of 0.12% and an apparent quantum yield of 4.1% at 420 nm were obtained, by far the highest among dye-sensitized water splitting systems and comparable to conventional semiconductor-based suspended particulate photocatalyst systems.
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