In situ external reflection absorption FTIR spectroscopy on lead electrodes in sulfuric acid

✍ Scribed by G.L.J. Trettenhahn; G.E. Nauer; A. Neckel

• Book ID: 103067696
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 806 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00389-4

✦ Synopsis

The oxidation and reduction reactions of lead electrodes in 5 molar sulfuric acid were investigated in situ using the technique of external reflection absorption infrared spectroscopy in combination with standard electrochemical techniques. The generation and consumption of lead sulphate were measured during galvanostatic experiments at different current densities. The amount of lead sulphate on the electrode surface was quantitatively determined by integrating the area of characteristic vibrational bands. Different anodic current densities lead only to a little different oxidation behaviour

of the lead electrodes, the thickness of the passive lead sulphate layer depends mainly on the consumed charge. An increase for the amount of lead sulphate on the electrode surface was found during the cathodic processes also in the region of the lead oxide reduction. This behaviour depends on the current densities applied and can be. explained by the chemical reaction of lead oxide with sulfuric acid or of freshly produced lead, forming lead sulphate.