Abstract
Plasmonic photocatalyst of Au nanoparticle-decorated hollow mesoporous TiO2 with 0, 0.1, 0.25, 0.5, and 1% Au content was successfully synthesized by a hydrothermal method. Controlling the particle size of Au coated on TiO2 hollow microspheres (AuTHMSs) is expected to improve the photocatalytic ability. Our results of X-ray absorption spectroscopy (XAS) indicated that the coated Au ions are nulvalent and cause a lattice distortion as well as a variation in Ti 3d orbital orientation. It is also inferred that TiO6 octahedral symmetry is significantly affected by the Au incorporation, giving rise to an increase in the Ti 3d t2g unoccupied state. UV–visible absorption spectra and I–V measurements were performed to examine localized surface plasmon resonance (LSPR) effect and photoelectrocatalytic (PEC) ability. We present the first in situ XAS measurements on AuTHMS system, which enabled us to correlate the electronic structure and photocatalytic property of the material. An analysis of the results showed an ...
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