Redox reactions of hydrosulphide ions on the platinum electrode—II. An impedance spectroscopy study and identification of the polysulphide intermediates

✍ Scribed by J. Szynkarczuk; P.G. Komorowski; J.C. Donini

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 516 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)00311-n

✦ Synopsis

Impedance spectroscopy was used to confirm the presence of a poorly conductive sulphur layer on a platinum electrode during the electrolysis of HS-. The double layer capacitance was found to be close to 4O~Fcm-' at open circuit potential. When electrolysis commenced the double layer capacttance was greatly reduced (< 5pFcm-*).

The charge transfer resistance increased to few hundred ohmscm' during electrolysis. Double potential chronocoulometric experiments were also performed. The chronocoulometric analysis showed that the average stoichiometry of the intermediate polysulphide ions m the electrolysis reaction was S:,, in the anodic step and S:,; in the cathodic step.