Electrochemical study of tellurium oxido-reduction in aqueous solutions

Barbier, M. J.; Becdelièvre, Anne-Marie de; Becdelièvre, Jean de

doi:10.1016/s0022-0728(78)80397-0

Cited by 16 publications

(14 citation statements)

References 3 publications

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“…The slime was very fine grained and dissolved slowly in the electrolyte, but it was possible to accumulate the powder in the amount sufficient for the chemical analysis. Such degradation of the tellurium electrode was observed earlier by others [3], but since now no identification of the compound was reported. Figure 7 shows current-time curves registered during potentiostatic cathodic dissolution of tellurium.…”

Section: Cathodic Polarizationsupporting

confidence: 53%

“…It was electrodeposition of elemental tellurium as a product of the reduction of HTeO 2 + ions or H 2 TeO 3 (process reversed to equation (3)). In contrast to the above, Barbier et al [3] reported that anodic polarization of tellurium in H 2 SO 4 solutions led to formation of TeO 2 , which dissolved then as HTeO 2 + ion and reduced to elemental tellurium at about -240 mV (SCE).…”

Section: Anodic Polarizationmentioning

confidence: 91%

“…Most of the studies have been focused on the electrodeposition of tellurium from acidic solutions [3][4][5][6][7][8][9]. Recently, interest in this area has been renewed due to the electrochemical deposition of semiconductors such as CdTe [7], ZnTe [10] or Bi 2 Te 3 [11,12] as examples.…”

Section: Introductionmentioning

confidence: 99%

“…However, there is relatively limited information on the effect of the solution pH on the anodic oxidation of tellurium [13,14]. Awad [13] determined potentials of tellurium anodes in acids (HClO 4 , H 2 SO 4 , HNO 3 ) as a function of acid concentration and current density. He found that the type of the dissolution product depends on the pH range: HTeO 2 + forms in the pH range of 0-0.8, H 2 TeO 3 forms above pH 1.8, whereas both species are present at intermediate pH.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Behavior of Tellurium in Acidic Nitrate Solutions

Rudnik

Biskup

2014

mafe

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Electrochemical behavior of tellurium in acidic nitrate solutionsElektrochemiczne zachowanie się telluru w kwaśnych roztworach azotanowych Abstract 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 the 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.Key words: tellurium, cyclic voltammetry, pH, electrochemistry, nitrate Streszczenie Przeprowadzono badania elektrochemiczne telluru w kwaśnych roztworach azotanowych o pH 1.5-3.0. Pomiary metodą woltammetrii cyklicznej wykazały obecność dwóch produktów tworzących się przy potencjałach powyżej 300 mV (NEK): rozpuszczalny HTeO 2 + (500 mV) i trudno rozpuszczalny H 2 TeO 3 (650 mV), przy czym pierwszy z nich stanowi produkt pośredni tworzenia się TeO 2 . Formowanie się produktów stałych w postaci porowatych warstw nie prowadziło do pasywacji elektrody. H 2 TeO 3 i TeO 2 ulegały rozpuszczaniu pod wpływem roztworu z utworzeniem HTeO 2 + , lecz proces ten ulegał zahamowaniu przez wzrost pH. Katodowa polaryzacja Metallurgy and Foundry Engineering -Vol. 40, 2014, No.

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Section: Cathodic Polarizationsupporting

confidence: 53%

Section: Anodic Polarizationmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Behavior of Tellurium in Acidic Nitrate Solutions

Rudnik

Biskup

2014

mafe

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“…(Lingane and Niedrach, 1948;Jamieson and Perone, 1969;Shinagawa et a/., 1977;Barbier et al, 1978). In addition, more cathodic potentials result if larger cathodic currents are used;…”

Section: Results Of the Proposed Modelmentioning

confidence: 99%

The periodic, electrochemical codeposition of cadmium and tellurium

Tobias

1987

AIChE Journal

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A mathematical model is presented for the codeposition of cadmium and tellurium onto a rotating‐disk electrode. The treatment incorporates the equation of convective diffusion for liquid phase mass transport, Butler‐Volmer expressions for charge‐transfer reactions, and a thermodynamic model for individual component activities in the solid state. Because of the formation of CdTe, a compound that has a large negative free energy of formation, the cadmium deposition reaction occurs at potentials substantially positive to its standard electrode potential (Uθ = −0.40 V). This reaction, along with the deposition of tellurium (Uθ = + 0.55 V), produces an electrodeposit that contains cadmium, tellurium, and cadmium telluride. The model can be used to calculate transient current‐potential relationships, ionic concentration profiles, and deposit compositions. Transport and kinetic parameters for cadmium and tellurium deposition are reported; a multidimensional optimization routine is used to evaluate physiochemical parameters from experimental data for the codeposition process.

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