Electrochemical Characterization and Oxygen Reduction Kinetics of Cu-incorporated Cobalt Oxide Catalyst

摘要

Electrochemical characterization of Cu incorporated cobalt oxide is carried out and oxygen reductionreaction (ORR) activity also determined at different catalyst loadings (CLs), using thin film rotatingdisk electrode (RDE) technology. Electrochemical properties such as the electrochemical surface area(ECSA), ORR, mass activity specific activity, as well as the durability of the electrocatalyst isevaluated. ESCA is determined by cyclic voltammetry (CV) measurements in 1 M KOH at 30 , + using scanning rates of 500 mV s . The active CO3 present in the surface of the (CuCoO)x latticeacts as a donorcceptor in the reduction sites during the ORR. The oxygen reduction activity for(CuCoO)x catalysts is evaluated at various rotation rate in the range 400000 rpm. The data areanalysed using the Kouteckyevich relationship; parallel lines indicate first-order kinetics. The- number of electrons transfer favours a 4e pathway oxygen reduction process, the rate constant of the reaction is in the range 0.07.11 mol L s at CL 0.05 mg cm .