Abstract

This paper presents graphite/paraffin composite electrodes modified with microparticles of nickel (Ni) and Ni-Fe alloy anchored in reduced graphene oxide (rGO); these electrodes were made by electrosynthesis. Firstly, the electrodeposition of reduced graphene oxide was made by cyclic voltammetry (CV) onto the graphite/paraffin electrodes’ surface. After electrodeposition of the rGO, iron and nickel were electrodeposited by CV with successive scans. Finally, the formation of iron-nickel oxyhydroxide on the electrode surface was performed by cyclic voltammetry in alkaline medium. The composites were investigated by field emission gun scanning electron microscopy (FEG-SEM); it was observed that the Ni microparticles had spherical shapes, while the Ni-Fe alloy did not present a defined shape. The composite electrodes were used to analysis ethanol and methanol electrooxidation in an alkaline medium of 0.10 mol L−1 of NaOH in a potential range of from −0.20 to 1.0 V (vs. Ag/AgCl) at 50 mV s−1 by CV. The electrodes were able to make the electrooxidation of ethanol at a potential of around 0.57 V for the electrode constituted by the Ni-Fe alloy and around 0.61 V for the electrode modified with Ni, and for methanol in a potential around 0.57 V for the Ni-Fe alloy and around 0.66 V for the Ni electrode. The Ni-Fe alloy electrodes showed the electrocatalysis of the alcohols in relation to Ni electrodes.

Highlights

  • Composite materials are have shown great attractions in manifold areas of knowledge [1]

  • Oliveira and collaborators [7] developed composite electrodes of nanoparticles of nickel oxyhydroxide deposited on reduced graphene oxide nanosheets on graphite/epoxy surfaces for oxidation and determination of alcoholic compounds

  • The surface morphology of the composite electrodes was studied by SEM

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Summary

Introduction

Composite materials are have shown great attractions in manifold areas of knowledge [1]. Carbonbased composite materials have demonstrated great advances in science, which can be used together with graphene oxide (GO) and metal particle catalysts for application in sensor [3], supercapacitors [4], electrocatalysts for fuel cells [5], reduction oxygen [6], among other applications. Oliveira and collaborators [7] developed composite electrodes of nanoparticles of nickel oxyhydroxide deposited on reduced graphene oxide nanosheets on graphite/epoxy surfaces for oxidation and determination of alcoholic compounds. The authors reported that the electrodes modified with graphene and nickel showed low limits of detection (LOD) for alcohols, in addition. Proc. 2020, 1, Firstpage-Lastpage; doi: FOR PEER REVIEW www.mdpi.com/journal/chemproc

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