کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
193503 | 459771 | 2008 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The electrochemical reduction of oxygen on zinc corrosion films in alkaline solutions The electrochemical reduction of oxygen on zinc corrosion films in alkaline solutions](/preview/png/193503.png)
Kinetics of the O2 reduction has been characterized on Zn corrosion films by Pt/Zn rotating ring-disc electrode (RRDE) and EIS methods. On zinc-oxide films a two-step reduction was identified in various buffer solutions of pH 10.5, while a small quantity of H2O2 intermediate could be detected. On the basis of results obtained from Pt/Zn and Pt/Pt RRDE experiments in solutions containing H2O2, it was further confirmed that the HO2− was reduced to OH− through the zinc-oxide corrosion layer. Capacitance data of the zinc-oxide/electrolyte interface calculated from steady-state impedance diagrams measured at various cathodic potentials indicate the presence of a space charge layer of the semi-metallic ZnO. The solid-state reaction mechanism of HO2− disproportion with participation of Zni+ interstitials, oxygen ion vacancies of the non-stoichiometric Zn-oxide, and chemisorbed HO2− is discussed.
Journal: Electrochimica Acta - Volume 53, Issue 7, 25 February 2008, Pages 3218–3230