Enhancement of ethanol oxidation on Pd electrodeposited over Sb2O3

Abstract

Electrodeposited Pd and Sb-Pd catalysts were tested for the ethanol oxidation reaction by cyclic voltammetry and chronoamperometry. Palladium-antimony deposit was synthesized on a glassy carbon substrate by a two-step process, comprising deposition of Sb followed by deposition of Pd. The Sb-Pd electrocatalyst with the Sn:Pd atomic ratio 0.2:0.8 was obtained. Compared with pure Pd, the incorporation of Sb results in the increase of activity and stability of bimetallic catalyst for the electrocatalytic ethanol oxidation reaction. Besides upon the end of the current-time transient, the investigated Sb-Pd catalyst was subjected to the potential cycling showing the ability to recover activity loss implying the surface composition stability. The enhanced performance of Sb-Pd is mainly ascribed to the bifunctional mechanism and electronic effect.

Elektrohemijski nataloženi Pd i Sb-Pd katalizatori su ispitivani u reakciji oksidacije etanola cikličnom voltametrijom i hronoampeometrijskom metodom.