Cyclic Voltammetric Studies of Tellurium in Diluted HNO3 Solutions

2011 ◽  
Vol 56 (2) ◽  
pp. 270-277 ◽  
Author(s):  
E. Rudnik ◽  
J. Sobesto
Keyword(s):  
Nitric Acid ◽  
Cathodic Polarization ◽  
Acid Solutions ◽  
Cyclic Voltammetric ◽  
Nitric Acid Solutions ◽  
Stationary Electrode ◽  
Voltammetric Studies ◽  
Acidic Electrolyte ◽  
Cyclic Voltammetric Studies

Cyclic Voltammetric Studies of Tellurium in Diluted HNO3SolutionsElectrochemistry of tellurium stationary electrode was studied in nitric acid solutions of pH 2.0 and 2.5. Two sparingly soluble products were formed at potentials above 200 mV (SCE): TeO2and H2TeO3. H2TeO3and TeO2could dissolve to HTeO+2under acidic electrolyte, but this process was hindered at pH 2.5. Cathodic polarization of tellurium electrode below -800 mV was accompanied by evolution of H2Te, which was then oxidized at the potentials approx. -700 mV.

scholarly journals Electrochemical Studies of Lead Telluride Behavior in Acidic Nitrate Solutions

2015 ◽  
Vol 60 (1) ◽  
pp. 95-100
Author(s):  
E. Rudnik ◽  
P. Biskup
Keyword(s):  
Cyclic Voltammetry ◽  
Nitric Acid ◽  
Anodic Dissolution ◽  
Lead Telluride ◽  
Electrochemical Studies ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Stationary Electrode ◽  
Acidic Electrolyte ◽  
Nitrate Solutions

Abstract Electrochemistry of lead telluride stationary electrode was studied in nitric acid solutions of pH 1.5-3.0. E-pH diagram for Pb-Te-H2O system was calculated. Results of cyclic voltammetry of Pb, Te and PbTe were discussed in correlation with thermodynamic predictions. Anodic dissolution of PbTe electrode at potential approx. -100÷50 mV (SCE) resulted in tellurium formation, while above 300 mV TeO2 was mainly produced. The latter could dissolve to HTeO+2 under acidic electrolyte, but it was inhibited by increased pH of the bath.

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