DOI:
Authors:
Immanuel Vincent, Dmitri Bessarabov
Abstract:
Electrochem nical characterization of Cu incorporated cobalt oxide is carried out and noxygen reduction nreaction n(ORR) activity also determined at different catalyst loadings (CLs), using thin film nrotating ndisk electrode (RDE) ntechnology. E nlectrochemical properties such as the electrochemical surface area n(ECSA), ORR, mass activity specific activity, as well as the durability of the electrocatalyst is nevaluated. nESCA is determined by cyclic voltammetry (CV) measurements in n1 M KOH nat 30 n nC, nusing scanning rates of 5 n– n100 mV s n– n1 n. The active CO n3 n+ npresent in the surface of the n(CuCoO) nx nlattice nacts as a donor n– nacceptor in the reduction sites during the ORR. nThe o nxygen reduction activity for n(CuCoO) nx ncatalysts is evaluated at various rotation rate nin the range 400 n– n3000 rpm. nThe data are nanalysed using the Koutecky n– nLevich relationship; nparallel lines indicate first n- norder kinetics. nThe nnumber of electrons ntransfer nfavours na 4e n- npathway noxygen reduction process n, the rate constant of the nreaction is in nthe range 0.07 n– n0.11 mol L n– n1 ns n– n1 nat CL 0.05 mg cm n– n2