Producción Científica Profesorado

Electrochemistry of scandium in the eutectic LiCl-KCl



Rodríguez Ávila, José Antonio

2012

Castrillejo, Y., Hernández, P., Rodríguez, J.A., Vega, M., Barrado, E. Electrochemistry of scandium in the eutectic LiCl-KCl, Electrochimica Acta, 2013, Vol. 71, p. 166-172, ISSN 0013-4686


Abstract


This work concerns the electrochemical extraction of scandium from molten chlorides. In this way, the electrodeposition of scandium has been investigated in the molten LiCl-KCl with the eutectic composition on a tungsten electrode in the 673-823 K temperature range by several electrochemical techniques (i.e. cyclic voltammetry, chronopotentiometry and chronoamperometry). It has been found that during cathodic polarization, deposition of metallic Sc from the chloride mixture onto the tungsten surface proceeds in a single step, and that electrocrystallization plays an important role in the whole process. Experimental current?time transients followed the theoretical models based on instantaneous nucleation with three dimensional growth of the nuclei. From chronopotentiometric measurements, the diffusion coefficient of the Sc(III) ions was determined by applying the Sand equation and modifying the immersion dept of the working electrode in stages. The activation energy for diffusion was found to be 38.18 1.95 kJ mol-1.The standard apparent potential value of the Sc(III)/Sc(0) system has been determined by potentiometry at several temperatures, and the activity coefficient of Sc(III) in the molten chloride media based on a pure supercool reference state has also been calculated.



Producto de Investigación




Artículos relacionados

Potentiometric Behavior of Diverse Polypyrrole-sulphate Films Electro Synthesized on Graphite - Epox...

Potentiometric behavior of graphite-epoxy electrochemical transducers towards anions, cations and pH...

Electrochemical and AFM characterization of the electropolimerization of pyrrole over a graphiteepox...

Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the D...

High-performance liquid magneto-chromatography

Determination of glucose by flow injection analysis with amperometric detection at Fe(III)-(tris(3,5...

Synthesis, characterization, and crystal structures of n-alkyldiorganodithiophosphates RS2P(OC6H4)2

Kinetics of Polypyrrole Films Doped with Sulphate Ions Electrodeposited Over Graphite - Epoxy Resin ...

Design and Construction of Solid State Ag/AgCl Reference Electrodes Through Electrochemical Depositi...

Metal content evaluation and its effect on the stability of anthocyanins