The electroreduction of niobium(V) in hydrochloric acid solutions at mercury electrodes II. Controlled-potential coulometry and stirred-pool chronoamperometry

McCullough, John G.

doi:10.1016/0368-1874(68)85037-3

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“…This corrosive/dissolution agent in the electrolyte attacks niobium species or niobium oxide leaching niobium precursor ionic species to the solution. Regarding the present experimental conditions (where pH ≈ 1 and 0.7M HF), the tendency of Nb(V) to be complexed by fluorides, resulting NbF6complex could be expected, which afterwards can be reduced to a metallic niobium [29,30,32]. Besides, in a HF-based electrolyte, in the near location of the working electrode oxygen (O 2-) species are generated which are needed for different kinds of niobium oxides NbO, NbO2, Nb2O5 and NbO4formation [32].…”

Section: Resultsmentioning

confidence: 87%

“…Research conducted by McCullough еt al. (1968) reported the mechanism of electroreduction of niobium(V) in hydrochloric acid on a mercury electrode [29,30]. Thin films of niobium oxides have been obtained at more accessible electrodes (SnO2-conducting electrode and platinum) from acidic aqueous solutions containing hydrogen peroxide as a precursor [22,23] and by electrodeposition or combining sol gel procedures with electrodeposition [24].…”

Section: Introductionmentioning

confidence: 99%

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

Vukićević

Cvetković

Jovanović

et al. 2019

Maced. J. Chem. Chem. Eng.

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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.

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Section: Resultsmentioning

confidence: 87%