Oxygen Electro-Reduction on C22 and C276 Nickel Metal Alloy

The C22 and C276 alloy metal surfaces were characterized for eletrochemical activity in alkaline aqueous media in the presence and absence of oxygen and at 30{degree sign}C. The metal was studied by electrochemical impedance spectroscopy (EIS), voltammetry with still electrode and a specialized rota...

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Bibliographic Details
Main Authors: Rogers, Stephen P., Gervasio, Dominic F., Payer, Joe H.
Format: Conference Proceeding
Language:English
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Summary:The C22 and C276 alloy metal surfaces were characterized for eletrochemical activity in alkaline aqueous media in the presence and absence of oxygen and at 30{degree sign}C. The metal was studied by electrochemical impedance spectroscopy (EIS), voltammetry with still electrode and a specialized rotating ring-disk electrode (RRDE) technique, the cyclic potential ring measurement (CPRM) method. The application of the CPRM method to the study of oxygen reduction on C22 and C276 showed strong evidence for a predominantly series 2 step, 2 electron oxygen reduction pathway, where kinetic rate constants k2 (evaluated at -0.7V versus the saturated calomel electrode) and k3 (evaluated at -1.2V) were estimated at 30 {degree sign}C to be 0.001 cm/s and 0.193 cm/s respectively for C22 and 0.013 cm/s and 0.232 cm/s respectively for C276.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.2789247