A Combination of Two Visible-Light Responsive Photocatalysts for Achieving the Z-Scheme in the Solid State

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The light reaction In natural photosynthesis is generally recognized as one of the most efficient mechanisms for converting solar energy into other energy sources. We report herein on a novel strategy for generating H(2) fuel via an artificial Z-scheme mechanism by mimicking the natural photosynthesis that occurs in green plants. Designing a desirable photocatalyst by mimicking the Z-scheme mechanism leads to a conduction band that is sufficiently high to reduce protons, thus decreasing the probability of charge recombination. We combined two visible light sensitive photocatalysts, CdS and carbon-doped TiO(2), with different band structures. The used of this combination, that is, CdS/Au/TiO(1.96)C(0.04), resulted in the successful transfer of photogenerated electrons to a higher energy level in the form of the letter 'Z'. The system produced about a 4 times higher amount of H#2# under irradiation by visible light than CdS/Au/TiO#2#. The findings reported herein describe an innovative route to harvesting energy by mimicking natural photosynthesis, and is independent of fossil fuels.
Publisher
AMER CHEMICAL SOC
Issue Date
2011-05
Language
English
Article Type
Article
Keywords

HYDROGEN-PRODUCTION; CARBON-DIOXIDE; SOLAR-CELL; WATER; IRRADIATION; PHOTOSYNTHESIS; EFFICIENCY; CATALYSTS; SYSTEM; FILMS

Citation

ACS NANO, v.5, no.5, pp.4084 - 4090

ISSN
1936-0851
DOI
10.1021/nn2006738
URI
http://hdl.handle.net/10203/201686
Appears in Collection
CBE-Journal Papers(저널논문)
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