Journal
NANO LETTERS
Volume 16, Issue 9, Pages 5347-5352Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01087
Keywords
Nanoparticles; photocatalysis; hydrogen; generation; water splitting
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Funding
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-SC0002106]
- U.S. Department of Energy (DOE) [DE-SC0002106] Funding Source: U.S. Department of Energy (DOE)
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The photocatalytic hydrogen (H-2) production activity of various CdSe semiconductor nanoparticles was, compared including CdSe and CdSe/CdS quantum dots ('QDs), CdSe quantum rods (QRs), and CdSe/CdS dot-in-rods (DIRs). With equivalent photons absorbed, the H-2 generation activity orders as CdSe QDs >> CdSe QRs > CdSe/CdS QDs > CdSe > CdSe/Cds, which is surprisingly the opposite of the electron hole separation efficiency. Calculations of photoexcited surface charge densities are positively correlated with the H-2 production rate and suggest the size of the nanoparticle plays a critical role in determining the relative efficiency of H-2 production.
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