Effects of accumulated electrons on the decay kinetics of photogenerated electrons in Pt/TiO2 photocatalyst studied by time-resolved infrared absorption spectroscopy

2003 ◽  
Vol 160 (1-2) ◽  
pp. 33-36 ◽  
Author(s):  
Akira Yamakata ◽  
Taka-aki Ishibashi ◽  
Hiroshi Onishi
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Infrared Absorption Spectroscopy ◽  
Tio2 Photocatalyst ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Photogenerated Electrons ◽  
Kinetics Of

scholarly journals Pressure dependence of electron- and hole-consuming reactions in photocatalytic water splitting on Pt/TiO2studied by time-resolved IR absorption spectroscopy

2003 ◽  
Vol 5 (1) ◽  
pp. 7-9 ◽  
Author(s):  
Akira Yamakata ◽  
Taka-aki Ishibashi ◽  
Hiroshi Onishi
Keyword(s):  
Water Vapor ◽  
Water Splitting ◽  
Absorption Spectroscopy ◽  
The Other ◽  
Ir Absorption ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Photogenerated Electrons ◽  
Reaction With Water ◽  
Kinetics Of

The decay kinetics of photogenerated electrons in the water splitting reaction on a Pt/TiO2photocatalyst was studied by time-resolved IR absorption spectroscopy. The decay of the photogenerated electrons within 2μs was decelerated when the catalyst was exposed to water vapor. The holes were consumed by the reaction with water instead of by the recombination with the electrons. On the other hand, the decay at 10–900μs was accelerated by the exposure. The electrons were consumed by the reaction with water. The rate of the hole-consuming reaction was independent of the pressure of water vapor, whereas that of the electron-consuming reaction increased with the pressure from 1 to 10 Torr. The different pressure dependences indicate different reactants involved in the oxidative and reductive reactants.

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