Naslov
Anodically formed oxide films and oxygen reduction on electrodeposited ruthenium in acid solution

Autori
Metikoš-Huković, Mirjana ; Babić, Ranko ; Jović, Franjo ; Grubač, Zoran

Izvornik
Electrochimica acta (0013-4686) 51 (2006), 7; 1157-1164

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ruthenium; ruthenium oxides; oxygen reduction; rotating ring-disk electrode; impedance spectroscopy; cyclic voltammetry

Sažetak
The impedance of the anodically formed hydrous Ru-oxide in the system Ru|oxide film|1M HClO_4 solution has been studied in the range of potentials were the electrode process occurs by a double electron and proton exchange between the oxide film and the solution. The results allowed us to clearly distinguish between the surface process at higher frequency, and the bulk process at lower frequency. The high frequency charging is found to be coupled to Faradaic charging at the film/solution interface. Evaluation of the impedance data at lower frequency, using diffusion equations for the finite boundary conditions, yields an effective proton diffusion coefficient to be 10^-10 to 10^-11 cm^2 s^-1. Oxygen reduction on the spontaneously oxidized ruthenium electrode was discussed on the basis of a rotating ring disk voltammetry.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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