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Physical and photoelectrochemical characterizations of SrWO4 prepared by thermal decomposition. Application to the photo electro-oxidation of ibuprofen

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Abstract

We have reported the semi conducting and photoelectrochemical properties of SrWO4 prepared by chemical route. The phase purity is confirmed by X-ray diffraction and the oxide is characterized by scanning electron microscopy, diffuse reflectance, and electrochemical impedance spectroscopy. SrWO4 crystallizes in the scheelite structure with an average crystallite size of 378 ± 6 nm. The Raman spectrum gives an intense peak at 920 cm−1 assigned to A g mode while the infrared analysis confirms the hexagonal coordination of tungsten. The UV-visible spectroscopy shows an indirect optical transition at 2.60 eV. SrWO4 exhibits n-type conduction by oxygen deficiency, confirmed by the chrono-amperometry and the intensity potential J(E) curve shows a small hysteresis. The Mott-Schottky plot gives electrons density of 5.72 × 1018 cm−3 and a flat band potential of 0.27 VSCE, indicating that the conduction band derives mainly from W6+: 6s orbital. The electrochemical impedance spectroscopy (EIS), measured in the range (1–105 Hz), shows the predominance of the bulk contribution with a dark impedance of 38 kΩ cm2. As application, the ibuprofen is degraded by electrocatalysis on SrWO4 with a conversion rate of 42%. An improvement up to 77% has been obtained by electrophotocatalysis under UV light; the conversion follows a first order kinetic with a rate constant of 2.32 × 10−4 min−1.

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Acknowledgements

The authors are thankful to Pr. M. Azzaz for the X-ray diffraction in the Laboratory of Sciences and Materials Engineering (USTHB).

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Authors and Affiliations

  1. Laboratory of Industrial Engineering and Environment, Faculty of Processes Engineering, USTHB, B.P. 32, 16111, Algiers, Algeria

    A. Sahmi & K. Bensadok

  2. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    H. Zirour & M. Trari

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  1. A. Sahmi
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  2. K. Bensadok
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  3. H. Zirour
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  4. M. Trari
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Correspondence to M. Trari.

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Sahmi, A., Bensadok, K., Zirour, H. et al. Physical and photoelectrochemical characterizations of SrWO4 prepared by thermal decomposition. Application to the photo electro-oxidation of ibuprofen. J Solid State Electrochem 21, 2817–2824 (2017). https://doi.org/10.1007/s10008-017-3599-y

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  • DOI: https://doi.org/10.1007/s10008-017-3599-y

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