Oxygen Reduction on Palladium Modified Zeolite 13X

Palladium was dispersed over zeolite NaX by procedure of impregnation/thermal degradation of palladium acetylacetonate salt. Samples characterization was performed by X-ray diffraction and SEM analysis. XR D analysis results showed that the decomposition of palladium acetyacetonate in air produced palladium oxide. According to the EDX analysis Pd content in palladium modified zeolite was 3.7 - 4. 0 wt . Electrochemical behavior of synthesized material was investigated in 0. 1 M NaOH. The influence o f addition of carbon black to composite electrode on its electrocatalytic performance was also investigated. Composite electrodes with and without carbon black were tested for oxygen reduction reaction. According to Koutecky-Levich slope the oxygen reduction reaction followed 4e- mechanism on both electrodes. The onset of ORR on the electrode with added carbon black was shifted toward more positive potentials for about 4 0 mV in comparison to the electrode without carbon black. The addition of carbon black to 13XPd enhanced the activity of electrode without changing the ORR overall mechanism