Citation: Na Lu, Tingting Pang, Xuedong Jing, Yongan Zhu, Linqun Yu, Sining Ben, Yuchan Song, Shiwen Du, Wei Lu, Zhenyi Zhang. Optimizing the Schottky Barrier in AuAg Alloy Decorated TiO2 Nanofibers to Enhance Hot-Electron-Induced CO2 Reduction[J]. Chinese Journal of Structural Chemistry, ;2025, 44(8): 100633. doi: 10.1016/j.cjsc.2025.100633 shu

Optimizing the Schottky Barrier in AuAg Alloy Decorated TiO2 Nanofibers to Enhance Hot-Electron-Induced CO2 Reduction

Plasmon-induced hot electron can transfer from noble metal to its cohesive semiconductor in their heterostructure to initiate the photocatalytic reaction upon resonance excitation. However, the co-excitation of semiconductor in the heterostructure would also lead to the inversus transfer of photo-electron from semiconductor to noble metal, which inevitably limits the use of active electrons. After co-excitation of both localized surface plasmon resonance (LSPR) of noble metal and interband transition of semiconductor, the interfacial electron transfer process strongly depends on the energy band configuration of their heterostructure. When the Au content in the AuAg alloy nanoparticles (NPs) changes from 0 to 100 at.%, the interfacial energy band configuration at AuAg NPs/TiO2 NPs in the electrospun nanofibers (NFs) shifts from Ohmic to Schottky contacts. Further investigation finds that the optimal Schottky barrier configuration in Au0.25Ag0.75/TiO2 NFs can not only boost the plasmon-induced hot electron transfer from Au0.25Ag0.75 to TiO2 NPs, but also suppresses the backflow of photo-electrons from TiO2 to Au0.25Ag0.75 NPs in NFs. Thus, upon UV-visible light irradiation, the CO2 photo-reduction activity of Au0.25Ag0.75/TiO2 NFs is ∼3 and ∼2 times higher than that of either Ag/TiO2 or Au/TiO2 NFs.
- Photocatalysis,
- Plasmonic hot-electron injection,
- Schottky barrier,
- AuAg alloy,
- CO2 reduction
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