Abstract
The phase structure of palladium–bismuth binary electrolytic deposit was studied. The electrodeposition of deposit components on the surface of a graphite electrode (GE) was carried out in situ. On current–voltage curves, the peak of bismuth electrooxidation, the peak of palladium electrooxidation and an additional peak at 0.15 V vs. Ag/AgCl are observed. The peak current at 0.15 V depends both on the concentration of palladium(II) ions and on that of bismuth(III) ions. The thermodynamic theory of alloys in the approximation of the theory of regular solutions was used for calculations. The mixing heat of the binary alloy components and the equilibrium potential of bismuth in the bismuth–palladium alloy are calculated. The calculated equilibrium potential of bismuth in an alloy with palladium is 0.12 V vs. Ag/AgCl which corresponds to the Bi2Pd intermetallic compound (IMC). Investigation of the surface of a GE with a palladium–bismuth deposit with use of scanning electron microscope showed that the electrolytic deposit contains bismuth, palladium and the Bi2Pd IMC. Peak at the potential of plus 0.15 V vs. Ag/AgCl is due to selective bismuth electrooxidation from the Bi2Pd IMC.
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Acknowledgements
The authors are grateful to the director of the Innovation Centre “Gold and Platinum” Pshenichkin A.Y., Ph.D., and Rudmin M.A., Ph.D., for the provision of scientific equipment, assistance, and support.
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This work was supported by the framework of Tomsk Polytechnic University Competitiveness Enhancement Program grant.
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Sabitova, Z.K., Oskina, Y.A. & Kolpakova, N.A. Study of electrooxidation of binary electrolytic deposit palladium–bismuth deposited on graphite electrode surface. J Solid State Electrochem 22, 3717–3723 (2018). https://doi.org/10.1007/s10008-018-4084-y
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DOI: https://doi.org/10.1007/s10008-018-4084-y