Anodic evolution of oxygen on ruthenium in acidic solutions

✍ Scribed by Chiaki Iwakura; Kazuhiro Hirao; Hideo Tamura

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 507 KB
• Volume: 22
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(77)85082-2

✦ Synopsis

A&met-Electrochemical

properties of ruthenium, particularly the anodic evolution of oxygen and anodic dissolution of ruthenium have been investigated by means of polarization measurements and product analyses. The electrode surface gradually colours black during oxygen evolution. This is due to the accumulation of hydrous RuO, resulting from decomposition of corrosion product. The black oxide film suppresses the ruthenium dissolution rate and the current efliciency for the dissolution reaction is less than 6% at a cd below 0.2 A/cm2 in 1 N H$O,, where the anodic evolution of oxygen is predominant. The overall current for oxygen evolution is expressed by i = nFkaiZ exp ( 2FEjRIJThe probable mechanism of oxygen evolution on the ruthenium anode under the Langmuir conditions of intermediate adsorption is S+HzO=SOH+H++e-, 2SOH3.4 SO + S + HLO, 2SO~2s + 02, 1. INTRODUCIION