Reduction of Graphene Oxide Using an Environmentally Friendly Method and Its Application to Energy-Related Materials

Ichiro Imae

doi:10.3390/coatings11030297

Abstract

Since graphene oxide can be synthesized in large quantities by oxidation of inexpensively available natural graphite and can be dispersed in water, it can be coated onto a variety of substrates by solution processes. Graphene oxide can also be reduced to yield reduced graphene oxide, which has similar electronic features to graphene. This review introduces the environmentally friendly methods for the synthesis of reduced graphene oxide utilizing electrochemical and thermal methods and summarizes our recent research results on their application to energy-related materials such as electric double-layer capacitors, thermoelectric devices, transparent conductive films, and lithium-ion secondary batteries.

Highlights

Graphene is a single layer of carbon atoms lined up in a hexagonal lattice, and graphite is composed of these multiple layers
We have been working on the development of thermoelectric materials based on polythiophenes with various molecular structures [25,26,27,28,29,30,31] and their composites with carbon nanotubes [32]. As part of these studies, we investigated the thermoelectric properties of the erGO/PAn composite film prepared by the method shown above
We have previously reported that when tetraethyl orthosilicate the glass substrate through chemical bonds (Figure 12), and we have succeeded in develin developing transparent conductive films with excellent mechanical propertie added to an aqueous dispersion a commercially available conducting oping transparent conductive films withof excellent mechanical properties such as scratchpolyme scratch hardness and adhesion strength

Summary

Introduction

Graphene is a single layer of carbon atoms lined up in a hexagonal lattice, and graphite is composed of these multiple layers. Chemical reduction is the electrode reaction and is more environmentally friendly than chemical reduction most frequently synthesize by the chemical reduction of oxygen methods in that itused doesmethod not useto toxic reagents.rGO Another feature is that the electronic state functional groups such as epoxy groups in GO using a reducing agent such as hydrazine of the resulting graphene can be manipulated by controlling the reduction level [2]. Reduction hydrogen ioreaction but ratherfrom a simple thermal decomposition which removes theusing oxygen functional dide has been attempted [3], but this method is industrially undesirable because groups (hydroxyl, epoxy, carboxyl groups, etc.) in GO This method can synthesize rGO hydrogen is highly. Reaction but rather a simple thermal decomposition which removes the oxygen functional

Synthesis of Graphene

Electrochemical Reduction of GO in Organic Solvents

The current flowing from around

10. Thermoelectric

Contents

Summary and Perspectives