Visible light active IrO2/TiO2 films for oxygen evolution from photocatalytic water splitting in an optofluidic planar microreactor

Laxmi Prasad Rao Pala and Nageswara Rao Peela

Renewable Energy, 2022, vol. 197, issue C, 902-910

Abstract: An optofluidic planar microreactor has been fabricated, with the photocatalyst (IrO2/TiO2) film coated glass as a reactor plate and plain glass as a cover plate. A rectangular region was completely etched on plain glass and used as a spacer between reaction and cover plates to create a planar microreaction compartment. The water splitting activity to produce oxygen using sodium iodate as a sacrificial agent (electron acceptor) was tested in the fabricated planar microreactor under visible light illumination (with 400 W metal halide lamp). The effect of catalyst coating thickness and the reactant flowrate on the rate of oxygen production was studied in detail. An oxygen evolution rate of 3.99 mmol h−1 g−1 (1.84 μmol h−1 cm−2) was observed from the IrO2/TiO2 film of 3078 ± 362 nm thickness at an optimal flow rate of 0.3 mL min−1 in the presence of visible light. The stability study showed that the IrO2/TiO2 film was stable for at least 4 cycles, indicating the superior activity of the film firmly adhered to the glass substrate.

Keywords: Optofluidic planar microreactor; Iridium oxide; Titanium dioxide thin film; Photocatalytic water splitting; Oxygen evolution; Sol-gel spin coating (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:197:y:2022:i:c:p:902-910

DOI: 10.1016/j.renene.2022.08.017

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