Document Type

Conference Proceeding

Publication Date

2017

Abstract

An enhanced electrocatalytic activity towards ethylene glycol oxidation reaction (EGO) in alkaline medium is observed at a glassy carbon (GC) electrode modified with a nanoparticle-based binary catalyst composed of Pt (nano-Pt) and cobalt oxide (nano-CoOx). The electrocatalytic activity of the modified electrodes towards EGO depends on the loading level as well as the composition of the catalyst layer atop the GC electrode surface. Several techniques including cyclic voltammetry (CV), field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) are used to address the catalytic activity of the proposed catalyst and to reveal their surface morphology and composition, respectively. CV measurements showed that the CoOx/Pt/GC electrode (with nano-Pt; furnished at the base and nano-CoOx; the topmost layer) support the largest increase in the oxidation peak current (Ip) of EGO, that is, Ip is two times larger than that obtained at Pt/GC electrode, concurrently with a significant negative shift in the onset potential (Eonset) of EGO by ≅ 170 mV. Moreover, this electrode showed a significant stability over a prolonged time of continuous electrolysis.

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