Voltammetric study of halide ion adsorption on platinum in perchloric acid solutions

✍ Scribed by M.W. Breiter

• Publisher: Elsevier Science
• Year: 1963
• Tongue: English
• Weight: 674 KB
• Volume: 8
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(62)87047-9

✦ Synopsis

Periodic current/potential curves were taken potentiostatically at 30 mV/sec on smooth platinum in 1 N HClO, with different additions of HCl, HBr, and HI, in the potential range between hydrogen evolution and deposition of oxygen or of the respective halide ion. The effect of increasing halide ion concentration, starting at 1O-6 M, on hydrogen adsorption and oxygen adsorption was studied systematically. Impedance measurements were made at 1000 c/s under the same conditions as the measurements of the current/potential curves. It is concluded from the dependence of the double layer capacitance upon the bulk concentration of halide ions in the double layer region that nearly a monolayer of adsorbed ions is present there for ,,cet-M lOTa M, ,,cBr M 1O-4 M, and ,,car w low5 M. The measurements at larger concentrations, especially for I-, show additional effects which are due to the deposition of halides and to the reverse reaction.