Influence of electrodeposition regime and Sn:Pd ratios in Sn-Pd electrocatalysts on ethanol oxidation reaction

Jelena Lović; Nebojša Nikolić; Predrag Živković; Silvana Dimitrijević; Maja Stevanović

doi:10.20450/mjcce.2023.2702

Authors

Jelena Lović Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Department of Electrochemistry
Nebojša Nikolić Department of Electrochemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, Serbia https://orcid.org/0000-0002-6385-5714
Predrag Živković Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia https://orcid.org/0000-0002-9268-9495
Silvana Dimitrijević Mining and Metallurgy Institute, Zeleni bulevar 35, Bor, Serbia https://orcid.org/0000-0003-1670-4275
Maja Stevanović Innovation Centre of the Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia https://orcid.org/0000-0002-0383-3935

DOI:

https://doi.org/10.20450/mjcce.2023.2702

Keywords:

electrodeposition, tin, palladium, electrocatalyst, electrooxidation

Abstract

A series of bimetallic Sn-Pd catalysts were prepared by a template-free two step electrodeposition method. According to this method, Sn was electrodeposited firstly in potentiostatic or galvanostatic regime on Cu electrodes in the form of dendrites, then Pd was galvanostatically electrodeposited in the second step on the electrode with the electrodeposited Sn dendrites. The produced Sn-Pd electrocatalysts were compared with an electrocatalyst obtained by Pd electrodeposition on a bare Cu electrode. The morphological and elemental analysis of Sn-Pd and Pd electrocatalysts was performed by means of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. The dendrites of various shapes and degree of branching were obtained by Sn deposition depending on electrodeposition regime, while Pd was electrodeposited in a form of compact Pd islands on both Sn dendrites and the Cu electrode. Cyclic voltammetry (CV) was applied for the electrochemical examination of Sn-Pd and Pd catalysts towards the ethanol oxidation reaction (EOR) in the alkaline solution. The electrocatalyst Sn_0.6-Pd_0.4 with an atomic ratio of 60 at.% Sn-40 at.% Pd showed higher oxidation efficiency and better tolerance towards intermediate species in EOR than the other examined electrocatalysts . It was shown that the lower fraction of Pd, relative to Sn, was crucial to achieving optimal synergy of Sn with Pd thus contributing to enhanced electrochemical behavior regarding EOR.

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Influence of electrodeposition regime and Sn:Pd ratios in Sn-Pd electrocatalysts on ethanol oxidation reaction

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