Chronopotentiometric investigation of Pb(II)/Pt electrode processes in molten Na2Si2O5

✍ Scribed by Bozena Strzelbicka; Aleksander Bogacz

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 438 KB
• Volume: 30
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(85)80143-2

✦ Synopsis

Abstrac

-The results are presented on chronopotentiomctric investigations of the transport process and mechanism of the Pb(II) ion reduction on platinum electrodes in liquid Na&lOs over the temperature range from 1173 to 1423 IL The Sand product was found to be constant in the region of the second-long transition time. A slight increase in the Sand product 1 -j<lr"' with the decreasing current density module was attributed to thermal convection. A sharp increase of the 1 -j.lr I'2 for high current densities, from 0.06 to 0.1 Acm-*, was explained as due to irreguhrities in the electrode surface. No effects related to charging of the double electric layer and electrode oxidation were found. The Sand product in the region of its constancy was found to be a Linear function of concentration. Diffusion coefficients ofthe Pb(II)ionin Na$!Gi,Os determined were 1.92 x LO-' and4.92 x IO-' cmzsml at 1173 and 1423 & respectively. A logarithmic form of the Arrhenius equation for diffusion of the Pb(I1) ions in liquid lUaZSi205 was provided. The galvanostatic process of reduction of the Pb(II) ion on platinum in liquid NazSizOb was defined as a reversible electrode reaction with the insoluble product.