Some effects of alternating current polarization on the surface of noble metal electrodes

✍ Scribed by J.P. Hoare

• Publisher: Elsevier Science
• Year: 1964
• Tongue: English
• Weight: 563 KB
• Volume: 9
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(64)80032-3

✦ Synopsis

Small electrodes of platinum, rhodium, palladium, iridium and gold were polarized with alternating current and alternating current biased with direct current. Only those metals which dissolve hydrogen-platinum and palladium-produced metal-black surfaces with alternating current polarization. The dissolved hydrogen plays an essential role in the break-up of the surface. Using a singlepulse technique, double layer capacitance data were obtained; they support these conclusions.

The superior behaviour of an anodized platinum indicator electrode may be traced to the presence of "oxygen bridges".

R&m&-De

petites electrodes de platine, rhodium, palladium, iridium et er ant et6 polar&es en courant altematif et en courant altematif bias& sur courant direct. On demontre que seuls les metaux qui dissolvent l'hydrogene, la platine et le palladium, se couvrent de noir metallique lors de la polarisation en courant altematif. L'hydrogene dissous joue un role essentiel dam la fragmentation de la surface. Par le moyen dune technique rl impulsions simples on a obtenu des don&es concernant la capacitt de la double couche, lesquelles cont?rment ces conclusions.

Le comportement sup&ieur de l'electrode indicatrice de platine anodid peut &re attribue il la presence de "pants d'oxygene".

Zusammenfassung-Kleine

Elektroden aus Platin, Rhodium, Palladium, Iridium und Gold wurden mittels Wechselstrom sowie mittels einem Gleichstrom iiberlagertem Wechselstrom polarisiert. Nur bei denjenigen Metallen,