Surface state modulation for size-controllable photodeposition of noble metal nanoparticles on semiconductors

Precise control of the size and distribution of noble metal nanoparticles exerts obvious effects on the performance of heterogeneous catalysts and has received tremendous interest. The photochemical deposition method has advantages in adjusting chemical states, morphology, etc. , but the tuning of s...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-01, Vol.8 (4), p.2194-2112
Main Authors: Huang, Lei, Liu, Xiu, Wu, Haocheng, Wang, Xiuli, Wu, Hongmin, Li, Rengui, Shi, Liyi, Li, Can
Format: Article
Language:English
Subjects:
Catalysts
Catalytic oxidation
Conduction bands
Control methods
Electronics industry
Gold
Hydrogen evolution
Metal oxides
Metals
Morphology
Nanoparticles
Noble metals
Oxidation
Palladium
Photocatalysis
Photochemicals
Photoelectrons
Platinum
Silver
Stability
Titanium dioxide
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Summary:Precise control of the size and distribution of noble metal nanoparticles exerts obvious effects on the performance of heterogeneous catalysts and has received tremendous interest. The photochemical deposition method has advantages in adjusting chemical states, morphology, etc. , but the tuning of size and distribution remains a big challenge. In this work, via modulating the surface states and surface charges of the TiO 2 support, the size and distribution of noble metals including Ag, Pt, Au and Pd were precisely controlled. We demonstrated that photoelectrons located in the conduction band tend to form larger noble metal nanoparticles, while surface state confined electrons could form smaller nanoparticles. The thus-prepared noble metals/TiO 2 catalysts exhibit good potential in both photocatalytic H 2 evolution and catalytic oxidation of HCHO. This work not only provides a green and effective method to control the particle size of noble metals on metal oxides, but also is helpful in understanding the role of surface states in photocatalytic processes. The size distributions of noble metals on semiconductors can be precisely controlled by the photodeposition method with modulated surface states.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta14181b