Journal
CHINESE JOURNAL OF CHEMICAL PHYSICS
Volume 31, Issue 5, Pages 613-618Publisher
CHINESE PHYSICAL SOC
DOI: 10.1063/1674-0068/31/cjcp1803044
Keywords
Metal-organic framework; Photocatalysis; Ultrafast spectroscopy; Transient absorption
Categories
Funding
- Ministry of Science and Technology of China [2016YFA0200602]
- National Natural Science Foundation of China [21573211, 21633007]
- Fundamental Research Funds for the Central Universities of China
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We report an ultrafast spectroscopy investigation that addresses the subtle location effect in a prototypical semiconductor-MOF hybrid system with TiO2 nanoparticles being incorporated inside or supported onto Cu-3 (BTC)(2), denoted as TiO2 @Cu-3 (BTC)(2) and TiO2/Cu-3(BTC)(2), respectively. By tracking in real time the interface electron dynamics in the hybrid system, we find that the interface states formed between TiO2 and Cu-3(BTC)(2) can act as an effective relay for electron transfer, whose efficiency rests on the relative location of the two components. It is such a subtle location effect that brings on difference in photocatalytic CO2 reduction using the two semiconductor-MOF hybrids. The mechanistic understanding of the involved interface electron-transfer behavior and effect opens a helpful perspective for rational design of MOF-based hybrid systems for photoelectrochemical applications.
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