Behaviour of passivating layer on potassium electrode in propylene carbonate

✍ Scribed by F.P. Dousek; J. Jansta

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 590 KB
• Volume: 29
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(84)80012-2

✦ Synopsis

The electrochemical behaviour of potassium in highly dried electrolyte (propylene carbonate-KPF,, -z 0.01 ppm H20) was studied under exclusion of contamination from the atmosphere and changes of the electrolyte concentration during current passage. Polarization curves and long-term dependences of the stationary electrode potential on time showed the existence of a passivating corrosion current, which is suppressed as soon as the electrode is either fully passivated or the solvent molecules at the electrode surface are exhausted by the formation of solvated potassium ions duringanodic polarization. Structural changes of the uassivatinp. laver are accomuanied bv changes of the K+ ions activity in it caunng differences in the eqtihbrium pote&al of the po&ssium electrode.