Journal
CHEMICAL PHYSICS LETTERS
Volume 770, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2021.138457
Keywords
Au-TiO2; Size effect; Photocatalysis; Microstructure; Charge transfer
Funding
- National Key Research and Development Program of China [2017YFA0303403]
- Shanghai Science and Technology Innovation Action Plan [19JC1416700]
- National Natural Science Foundation of China [61974042, 11774092]
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The size of Au particles has a significant impact on the photocatalytic performance, mainly affecting the electron transfer mechanism and interface microstructure. The overall photoelectric properties of samples are determined by size effect, but the number and transport behavior of carriers at the interface fundamentally affect the photocatalytic performance.
A model system of oxygen vacancy modified titanium dioxide (TiO2-x) nanobelts supported Au nanoparticles with different sizes is prepared for methylene blue photodegradation. The Au/TiO2-x heterostructure with the smallest Au size exhibits the best performance than other samples. Based on detailed microstructural investigations, the effect of Au particle size on the photocatalytic performance is revealed in the view points of electron transfer mechanism and interface microstructure. It implicates that although the size effect determines the overall photoelectric properties of samples, it is the number and transport behavior of carriers at the interface that fundamentally affect the photocatalytic performance.
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