Gold-Titanium Dioxide Half-Dome Heterostructures for Plasmonic Hydrogen Evolution

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Plasmonic water splitting gains increasing attention due to their broad absorption spectra and excellent chemical stability. However, plasmonic water splitting suffers from low efficiency due to difficulties of utilizing plasmonic energetic charge carriers. Structural factors need to be carefully examined to overcome the short lifetime of plasmonic hot carriers. Here we investigate Au/TiO2 half-dome patterns as a plasmonic photoelectrode to examine the effects of incident light angle and orientation of nanostructures on photochemical hydrogen evolution. Half-dome structures exhibit 4- and 3-fold higher photocurrent density and photovoltage, respectively, than a flat thin film. The enhanced photoreactivity is ascribed to the increased angle between the Au/TiO2 interface and the electric field of irradiated light. The result indicates that the kinetic momentum of the incident photon can significantly contribute to hot electron injection and reaction rate. The monolithic Au/TiO2/Pt half-dome structures are also constructed to show sustainable hydrogen evolution without external bias under visible light illumination.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-10
Language
English
Article Type
Article
Citation

ACS APPLIED ENERGY MATERIALS, v.1, no.10, pp.5169 - 5175

ISSN
2574-0962
DOI
10.1021/acsaem.7b00262
URI
http://hdl.handle.net/10203/251661
Appears in Collection
MS-Journal Papers(저널논문)
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