Abstract
Electrocatalytic materials offer numerous benefits due to their wide range of applications. In this study, a polyol technique was used to synthesize PdNi nanoparticles (NPs) with different percent atomic compositions (Pd = 50 to 90%) to explore their catalytic efficiency. The produced nanoparticles were characterized using X-ray diffraction (XRD) and electrochemical investigations. According to XRD measurements, the synthesized NPs were crystalline in nature, with crystallite sizes of about 2 nm. The electrochemical properties of the synthesized NPs were studied in alkaline solution through a rotating ring-disk electrode (RRDE) technique of cyclic voltammetry. The PdNi nanoparticles supported on carbon (PdNi/C) were used as electrocatalysts and their activity and stability were compared with the homemade Pd/C and Pt/C. In alkaline solution, PdNi/C electrocatalysts showed improved oxygen reduction catalytic activity over benchmark Pd/C and Pt/C electrocatalysts in all composition ratios. Furthermore, stability experiments revealed that PdNi 50:50 is more stable in alkaline solution than pure Pd and other PdNi compositions.
Highlights
oxygen reduction reaction (ORR) polarization curves for Pd/C, Pt/C, and PdNi supported on carbon (PdNi/C) electrocatalysts indicate that the electrochemical reaction is led by kinetic and mixed activation-diffusion control across almost the entire potential range
The findings show that adding Ni to Pd increases ORR mass specific activity, which is consistent with previous findings for PdNi nanoparticles in the and leads to higher specific activity, which is consistent with previous findings for literature
The working electrodes were a rotating ring-disk electrode and a glassy carbon disk with a layer of the catalyst deposited on its surface
Summary
A number of oxygen-containing species such as OH− , O2 − , HO2 − and H2 O2 are produced in aqueous media during the process which compete with oxygen reduction on electrode surface involving adsorption and desorption processes [3]. Due to their immense importance in storage devices and electrochemical energy conversion systems, the oxygen reduction reaction on the cathode is extensively studied and still research in this field is in progress. Palladium alloys containing other transition metals have shown increased oxygen reduction efficiencies [7,8,9]. During the experiments to compare the oxygen reduction activities of the catalysts in alkaline medium and check their stabilities
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