Carbon-supported Ag-Pd bimetallic NPs electrocatalyst were successfully synthesized via the RoDSE technique in a nominalprecursor solution mass-to-mass ratio of 4:1(Ag: Pd), as a cost-effective means to improve catalytic activity while minimizing costs. The work presented here compares three different methods of electrodeposition using the RoDSE technique. RoDSE is a robust electrodeposition method consisting of the rotating disk slurry electrode (RoDSE) which allows for the synthesis of highly dispersed Ag/Pd nanoparticles on Vulcan XC-72R in acidic media to minimizing the time spent in catalyst preparation.The tested method consisted on an (1) alternated, (2) sequential and (3) simultaneous electrodeposition of Ag and Pd on unsupported Vulcan XC-72R. Different characterization techniques were used, such as TEM, XRD, ICP and Raman spectroscopy confirming the presence of Ag and Pd on the carbon support. The Ag/Pd face centered cubic crystal facets were determined by XRD with an approximate particle size of 23.3 nm for the different methods. Performance of the electrochemical methods were assessed for the oxygen reduction reaction (ORR) using: cyclic voltammetry and rotating disk electrode techniques. Herein, we demonstrate that among the three methods to electrodeposited bimetallic, the simultaneous approach performed better catalytic activity for ORR in terms of E<sub>onset</sub>, limiting current density and performed a four-electron pathway for ORR in alkaline media, in O<sub>2-</sub>saturated 0.1 M KOH solution.

Silver-palladium bimetallic nanoparticles on unsupported vulcan XC-72R as electrocatalysts toward oxygen reduction reaction in alkaline media

2019 Spring National Meeting

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