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

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  • Pala, Laxmi Prasad Rao
  • Peela, Nageswara Rao

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.

Suggested Citation

  • Pala, Laxmi Prasad Rao & Peela, Nageswara Rao, 2022. "Visible light active IrO2/TiO2 films for oxygen evolution from photocatalytic water splitting in an optofluidic planar microreactor," Renewable Energy, Elsevier, vol. 197(C), pages 902-910.
    • Handle: RePEc:eee:renene:v:197:y:2022:i:c:p:902-910
    DOI: 10.1016/j.renene.2022.08.017
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    References listed on IDEAS

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    1. Cheng, Xiao & Chen, Rong & Zhu, Xun & Liao, Qiang & An, Liang & Ye, Dingding & He, Xuefeng & Li, Shuzhe & Li, Lin, 2017. "An optofluidic planar microreactor for photocatalytic reduction of CO2 in alkaline environment," Energy, Elsevier, vol. 120(C), pages 276-282.
    2. Chen, Rong & Li, Lin & Zhu, Xun & Wang, Hong & Liao, Qiang & Zhang, Mu-Xing, 2015. "Highly-durable optofluidic microreactor for photocatalytic water splitting," Energy, Elsevier, vol. 83(C), pages 797-804.
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