Add time:08/09/2019         Source:sciencedirect.com

Bimetallic alloyed palladium-nickel electro-catalysts supported on carbon (Vulcan XC-72) with various Pd to Ni atomic ratios have been successfully synthesized by an impregnation technique for the oxygen reduction reaction (ORR). The electro-catalysts are structurally characterized by XRD, FESEM-EDX, ICP-OES, TEM, and XPS. The EDX and mapping images confirm that Pd and Ni elements have been uniformly dispersed in the Pd8Ni2/C. TEM images illustrate that the metallic nanoparticles have been considerably distributed on the substrate with low agglomeration. Cyclic voltammetry (CV), rotating disk electrode (RDE), and chronoamperometry (CA) are applied to specify the electrochemical properties of the Pd-Ni alloys. It is demonstrated that the Pd8Ni2/C exhibits higher ORR activity and methanol tolerance in comparison with the Pd/C. Significantly, the Pd8Ni2/C shows higher durability than the Pd/C, this is attributed to a lower loss of electrochemical active surface area in the accelerated durability test (ADT). The Koutecky-Levich analysis suggests that the Pd8Ni2/C proceed the ORR through a 4e− process. The enhanced activities are connected with the synergistic effects and alloyed structures of the Pd-Ni samples. Finally, excellent performances in higher power density and stability are achieved when Pd8Ni2/C is utilized as the novel cathode catalyst for passive direct methanol fuel cells (DMFCs).

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