Polarization of the solid-electrolyte cell Ag/Ag3SI/I2

✍ Scribed by T. Takahashi; O. Yamamoto

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 398 KB
• Volume: 11
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(66)87068-8

✦ Synopsis

The solid-electrolyte cell in which AgsSI was used as electrolyte shows a fairly large polarization;

a theoretical equation is derived to explain it. The polarization of the cell with a silver plate anode can be explained by reaction polarization, the reaction between interstitial silver ions and silver-ion vacanctes being rate-determining. The theoretical equation is

where a, is the electrical conductivity of interstitial silver ion, V, a constant, AE the overvoltage, Z the current density and e the electronic charge, and this fits the experimental data.

In the cell with an amalgamated silver anode, reaction polarization does not appear because the interstitial silver ion reacts with mercury and here polarization is due almost entirely to resistance. Resume-L'&ctrolyte solide A&S1 implique la grande polarisation dune cellule; tme equation theorique l'interprete. La polarisation dune cellule ii anode en plaque d'argent peut s'expliquer par une polarisation de reaction, l'etape r6gulatrice &ant tme reaction entre les Ag+ intersticiels et lea lacunes cationiques. L'equation theorique, satisfaisant effectivement aux dormees experimentales, peut s%crire Z = l/[V,(RT/Z')u,e][exp (AEF/RT) -11, a,, &ant la conductivit6 due a Ag+ intersticiel, V, une constante, E la surtension, Z la densite de courant, e la charge blectronique. Dans une cellule a anode d'amalgame d'argent, cette polarisation de reaction n'apparalt pas parce que Ag+ intersticiel @it avec le mercure: la polarisation observee eat alors seulement due a la resistance.