▎ 摘　　要

In this study, we present an electrochemically improved electrode by using graphene-metal oxide composite materials, having a high specific surface area and high current density. The morphological and micro-structure properties were investigated by field-emission scanning electron microscopy system (FE-SEM), transmission electron microscopy (TEM), and X-ray diffractometer (XRD). The electrochemical behaviors were investigated by cyclic voltammetry (CV). The prepared samples having Co3O4 particles on GNS provided the enhanced electrochemical reaction sites and ion-intercalation spots, which were accessible to supporting electrolyte ion effectively. We could confirm that GNS-Co3O4 composite electrode had the superior electrochemical activity than other comparative samples.