Browsing by Subject "cyclic voltammetry"

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Access status: Restricted ,
Design of new $Cu-Fe$ metallic oxide foams formed by electrodeposition for asymmetric supercapacitors electrodes
(Data obrony: 2014-03-28) Lange, Grzegorz
Wydział Energetyki i Paliw
Access status: Open Access ,
Electrochemical behavior of tellurium in acidic nitrate solutions
(2014) Rudnik, Ewa; Biskup, Przemysław
Electrochemistry of tellurium stationary electrode was studied in acidic nitrate solutions with pH 1.5 – 3.0. Cyclic voltammetry indicated that two products were formed at potentials above 300 mV (SCE): soluble $HTeO_{2}^{+}$ (500 mV) and sparingly soluble $H_{2}TeO_{3}$ (650 mV), but the former seemed to be an intermediate product for $TeO_{2}$ precipitation on the electrode surface. Formation of the solid products as porous layers was almost undisturbed and no electrode passivation was observed. $H_{2}TeO_{3}$ and $TeO_{2}$ dissolved to $HTeO_{2}^{+}$ under acidic electrolyte, but this process was hindered by pH increase. Cathodic polarization of tellurium electrode below -800 mV was accompanied by evolution of $H_{2}Te$, which was then oxidized at the potentials approx. -700 mV. $H_{2}Te$ generated in the electrochemical reaction decomposed to elemental tellurium as black powdery precipitates in the bulk of the solution and a bright film drifting on the electrolyte surface.