Formation of niobium oxides by electrolysis from acidic aqueous solutions on glassy carbon

Authors

  • Nataša M Vukićević Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12
  • Vesna S Cvetković Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12
  • Ljiljana S Jovanović Faculty of Science, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3
  • Miroslav M Pavlović Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12
  • Jovan N Jovićević Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12

DOI:

https://doi.org/10.20450/mjcce.2019.1623

Keywords:

electrochemical deposition, niobium oxides, acidic solution, glassy carbon

Abstract

In this study niobium oxide films were formed without peroxo-precursors from three different mixed acidic aqueous solutions on glassy carbon. Linear sweep voltammetry and potential step were techniques used for electrochemical experiments. The simultaneous and consecutive electrochemical reduction of water, nitrate and sulphate ions provided an alkaline environment with oxygen in the near vicinity of the working cathode, which in combination with the present niobium ions, produced niobium oxides and/or oxyhydroxides on the glassy carbon substrate. The formed deposits were analyzed using scanning electron microscopy and energy dispersive spectroscopy and appear to consist of NbO, NbO2 and Nb2O5. Both the niobium and acid concentration of the electrolytes used influenced the morphology and particle size of the deposits. The formation of niobium-fluoride and hydrogen-niobiumoxide complexes is addressed.

Author Biographies

Nataša M Vukićević, Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12

Department of Electrochemistry, Assistant Research Professor

Vesna S Cvetković, Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12

Department of Electrochemistry, Assistant Research Professor

Ljiljana S Jovanović, Faculty of Science, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3

Department of Chemistry, Biochemistry and Environmental Protection, Professor

Miroslav M Pavlović, Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12

Department of Electrochemistry, Assistant Research Professor

Jovan N Jovićević, Institute of Chemistry, Technology and Metallurgy, National Institute, Department of Electrochemistry, University of Belgrade, Njegoševa 12

Department of Electrochemistry, Professor

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Published

2019-05-16

How to Cite

Vukićević, N. M., Cvetković, V. S., Jovanović, L. S., Pavlović, M. M., & Jovićević, J. N. (2019). Formation of niobium oxides by electrolysis from acidic aqueous solutions on glassy carbon. Macedonian Journal of Chemistry and Chemical Engineering, 38(1), 39–48. https://doi.org/10.20450/mjcce.2019.1623

Issue

Vol. 38 No. 1 (2019)

Section

Electrochemistry