Abstract
The Pd loading of Pd/MnO2 electrocatalysts was studied to evaluate the performance and the mechanism for the oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) in aqueous electrolyte, as a model of cathodic and the anodic reactions that take place in anionic exchange membrane fuel cells (AEMFC). Regarding the ORR, it was stated that the pure MnO2 nanorods showed catalytic activity towards it. However, the increase in Pd loading enhanced the catalytic kinetic parameter such as Eonset, E1/2, Jlim, and k. Moreover, the Koutecky-Levich analysis exhibited that the ORR process takes place via 4 electrons transferred. Conversely, pure MnO2 nanorods do not show catalytic activity towards HOR; Pd/MnO2 from to 1%Pd loading exhibited catalytic activity, the kinetic parameters were enhanced as Pd loading increases. In both cases, the rate-determining step (RDS) of the ORR and HOR evolved according to the Pd loading. Based on the findings of this research we can establish that Pd/MnO2 catalysts are an excellent option in the catalysis of the ORR and HOR, exhibiting potential application in AEMFC.
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