Electrochemical behavior of tellurium in acidic nitrate solutions

• Autorzy: Rudnik E. , Biskup P.

Identyfikatory

DOI

10.7494/mafe.2014.40.1.15

Warianty tytułu

Elektrochemiczne zachowanie się telluru w kwaśnych roztworach azotanowych

• Języki publikacji: EN

Abstrakty

EN

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 HTeO2+ (500 mV) and sparingly soluble H2TeO3 (650 mV), but the former seemed to be an intermediate product for TeO2 precipitation on the electrode surface. Formation of the solid products as porous layers was almost undisturbed and no electrode passivation was observed. H2TeO3 and TeO2 dissolved to HTeO2+ 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 H2Te, which was then oxidized at the potentials approx. –700 mV. H2Te 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.

PL

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 HTeO2+ (500 mV) i trudno rozpuszczalny H2TeO3 (650 mV), przy czym pierwszy z nich stanowi produkt pośredni tworzenia się TeO2. Formowanie się produktów stałych w postaci porowatych warstw nie prowadziłodo pasywacji elektrody. H2TeO3 i TeO2 ulegały rozpuszczaniu pod wpływem roztworu z utworzeniem HTeO2+, lecz proces ten ulegał zahamowaniu przez wzrost pH. Katodowa polaryzacja elektrody tellurowej poniżej –800 mV prowadziła do tworzenia się H2Te, który ulegał utlenianiu przy potencjałach ok. –700 mV. H2 Te generowany w reakcji elektrodowej ulegał rozpadowi do telluru elementarnego występującego w dwóch postaciach (jako czarny osad i srebrzysty film).

Słowa kluczowe

EN

tellurium; cyclic voltammetry; pH; electrochemistry; nitrate

PL

tellur; woltamperometria cykliczna; pH; elektrochemia; azotan

• Wydawca: AGH University of Science and Technology Press
• Czasopismo: Metallurgy and Foundry Engineering
• Rocznik: 2014
• Tom: Vol. 40 no. 1
• Strony: 15--31
• Opis fizyczny: Bibliogr. poz. 20, wykr., rys., tab.

Twórcy

autor

Rudnik E.

• GH University of Science and Technology, Faculty of Non-Ferrous Metals, Krakow, Poland

autor

Biskup P.

• Royal Group, PO Box 5151, Eastern Ring Road, Abu Dhabi, United Arab Emirates

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