Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 6, Issue 2, Pages 479-487Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy01002k
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- NRC, Sri Lanka [NRC 07-46]
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The Ag2O/TiO2 catalyst produces hydrogen with water and water/methanol mixture upon irradiation with IR light. In this report, the material aspects and photocatalytic mechanism of an IR-active Ag2O/TiO2 photocatalyst for water splitting reaction were investigated. The Ag2O/TiO2 catalyst contained 28% silver and 72% titanium by w/w and the XPS and XRD results revealed the presence of Ag2O (Ag+), Ago, TiO2 (Ti4+) and Ti3+ states in the Ag2O/TiO2 catalyst. A solid proof of the IR photon-initiated catalytic activity of the Ag2O/TiO2 catalyst was observed from the clear and enhanced IR response in the incident photon current conversion efficiency measurements of the Ag2O/TiO2 catalyst. Comparing the band gap energies to the energy of the IR source, plasmon-assisted photocatalytic activity and/or sub-band gap phononassisted multi-photon excitation mechanisms are proposed for the observed infrared photocatalytic activity of the Ag2O/TiO2 photocatalyst and the functions of Ag2O and TiO2 in dark photocatalysis are discussed.
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