The
visible light-active Pt/TiO2 photocatalyst thin
films were prepared by photo-depositing Pt onto the sol–gel
TiO2 spin-coated films. An optofluidic planar microreactor
was fabricated using a Pt/TiO2 film-coated glass substrate
as the bottom plate and an uncoated glass substrate containing a planar
reaction chamber as the cover plate. The Pt/TiO2 thin films
were tested for the photocatalytic water splitting activity in the
presence of methanol as the sacrificial agent to produce hydrogen
under visible/solar light irradiation. The effect of catalyst film
thickness, reactant flow rate, light intensity, and type of light
source on the rate of hydrogen production was studied. The Pt/TiO2 film with a thickness of 1650 ± 119 nm showed a highest
rate of 16.35 mmol h–1 g–1 (4.7
μmol h–1 cm–2) hydrogen
production at an optimum reactant flow rate of 0.3 mL min–1 under visible light (400 W metal halide lamp) irradiation. The stability
study carried out for four cycles of 5 h runs proved that the photocatalyst
was stable and the film was well adhered to the glass substrate. A
hydrogen production rate of 0.766 mmol h–1 g–1 (0.22 μmol h–1 cm–2) and a solar to hydrogen conversion efficiency of 0.015% were obtained
under a simulated solar light irradiation of ∼100 mW cm–2 intensity, proving the solar light activity of the
Pt/TiO2 film.
Copper tetraphenylporphyrin tetrasulfonic acid (Cu-Por) metal complex has been anchored over graphitic carbon nitrides (GCN) sheets by electrostatic interaction. The incorporation of photosensitizer through π-π interactions has greatly enhanced the...
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