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Electrochemical studies on the reduction behaviour of ruthenium nitrosyl ions in nitric acid medium

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Abstract

To understand the low recovery of ruthenium from ruthenium nitrosyl nitrate solution by electro-deposition technique, electro-reduction behaviour of ruthenium nitrosyl complex [RuII–NO+]3+ in nitric acid medium was investigated using the potentiostatic electrolysis techniques, cyclic voltammetry and chronopotentiometry at Pt and glassy carbon working electrodes. Reduction of [RuNO]3+ was found to be quasi-reversible, one electron transfer process at both the electrodes. The diffusion coefficient (D 0) of [RuNO]3+ species estimated by these techniques was in the order of 10−8 cm2 s−1 and the heterogeneous electron transfer rate constant (k s) for the reduction of [RuNO]3+ was estimated to be about 10−5 cm s−1 using Klingler and Kochi equation. The very low diffusion coefficient value and the low separation percentage of Ru from ruthenium nitrosyl nitrate solution by electro-deposition technique are attributed to the existence of Ru(II) in different stable complexes instead of bare Ru(II) ions, in nitric acid medium.

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Acknowledgments

Ms. Pravati Swain acknowledges the financial support provided by Department of Atomic Energy in the form of Research Fellowship.

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Authors and Affiliations

  1. Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    Pravati Swain, C. Mallika, U. Kamachi Mudali & R. Natarajan

  2. Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    Ch. Jagadeeswara Rao

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  1. Pravati Swain
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  2. C. Mallika
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  3. Ch. Jagadeeswara Rao
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  4. U. Kamachi Mudali
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Correspondence to C. Mallika.

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Swain, P., Mallika, C., Jagadeeswara Rao, C. et al. Electrochemical studies on the reduction behaviour of ruthenium nitrosyl ions in nitric acid medium. J Appl Electrochem 45, 209–216 (2015). https://doi.org/10.1007/s10800-014-0759-y

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  • DOI: https://doi.org/10.1007/s10800-014-0759-y

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