Journal
ENERGY & FUELS
Volume 35, Issue 23, Pages 19737-19747Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c02686
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Funding
- Department of Science and Technology (DST), India under the special scheme of Clean Energy Research Initiative (CERI) [DST/TM/CERI/C19(G)]
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The study investigated the photocatalytic water splitting activity of Pt/TiO2 thin films, concluding that the film thickness of 1650 +/- 119 nm exhibited the highest hydrogen production rate. Under visible light and simulated solar light irradiation, the Pt/TiO2 films showed a high rate of hydrogen production and solar to hydrogen conversion efficiency.
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 mu mol 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 mu mol h(-1) cm(-2)) and a solar to hydrogen conversion efficiency of 0.015% were obtained under a simulated solar light irradiation of similar to 100 mW cm(-2) intensity, proving the solar light activity of the Pt/TiO2 film.
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