| 초록 |
In this work, we developed a simple and efficient way for Synthesis of three-dimensional (3D) Co3O4-anchored graphene composites using sacrificial template-assisted method and subsequent deposition process of Co3O4 nanoparticles. As structural guiding materials, polystyrene spheres provide 3D porous architectures with a high surface area. 3D porous graphene materials serve as conductive supporters for deposition of Co3O4 nanoparticles through precipitation growth. The 3D porous composite structures of Co3O4/graphene composites were intensively investigated using scanning electron microscope, transmission electron microscope, and X-ray diffraction. The 3D Co3O4/graphene composites show a high specific capacitance 328 F g−1 with efficient and fast charge-discharge process in aqueous 6 M KOH electrolyte. besides, the composites provide a good cycle lifetime, which retained 98% capacitance retention over 2000 cycles. |
