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Electrochemical evaluation of IrO2–Ta2O5-MWCNT-coated anodes with different pretreatments of titanium substrate

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Abstract

Mixed metal oxide coatings of IrO2–Ta2O5 modified with multiwalled carbon nanotubes (MWCNTs) were applied on Ti anodes by thermal decomposition method. Effects of nanoporosities film formation and rough structures were examined on the electrocatalytic activity and stability of the anodes. In this respect, the electrochemical response of samples subjected to different pretreatments, including the formation of TiO2 nanotubes by anodizing and etching in 20% oxalic acid, was investigated by cyclic voltammetry, potentiodynamic polarization, galvanostatic, and impedance spectroscopy. IrO2–Ta2O5-MWCNT coating on the etched and anodized substrate formed a compact morphology with fewer cracks. Microstructural examination of coatings showed that the distribution of active IrO2 particles was changed by anodizing pretreatment. The charge transfer resistance of dimensionally stable electrode with anodizing surface preparation was approx. 32% lower than the etched sample due to the porous nature of the Ti/coating interface. The addition of MWCNT to IrO2–Ta2O5 coating on the etched Ti anode extended its service life by ~ 70%, while the formation of TiO2 nanotubes as the result of anodizing surface pretreatment reduced the electrode stability.

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Acknowledgements

Funding was provided by Amirkabir University of Technology.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave, P.O. Box 15875-4413, Tehran, Iran

    Mehrad Mehdipour, Seyed Hadi Tabaian & Sadegh Firoozi

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  1. Mehrad Mehdipour
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  2. Seyed Hadi Tabaian
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  3. Sadegh Firoozi
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Correspondence to Seyed Hadi Tabaian.

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Mehdipour, M., Tabaian, S.H. & Firoozi, S. Electrochemical evaluation of IrO2–Ta2O5-MWCNT-coated anodes with different pretreatments of titanium substrate. J IRAN CHEM SOC 18, 233–243 (2021). https://doi.org/10.1007/s13738-020-02020-y

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  • DOI: https://doi.org/10.1007/s13738-020-02020-y

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