Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, China.
Phys Chem Chem Phys. 2013 Aug 21;15(31):12940-5. doi: 10.1039/c3cp51710a.
Three-dimensional (3D) graphene-based composite materials have attracted increasing attention, owing to their specific surface area, high conductivity and electronic interactions. Here, we report a convenient route to fabricate a 3D Co3O4/Graphene Hydrogel (CGH) composite as an electrode material for supercapacitors. Utilizing the gelation of a graphene oxide dispersion enables the anchoring of Co3O4 nanoparticles on the graphene sheet surfaces and formation of the hydrogel simultaneously. Remarkably, the spherical Co3O4 particles can serve as spacers to keep the neighboring graphene sheets separated. The CGH exhibits a high specific capacitance (Cs) of 757.5 F g(-1) at a current density of 0.5 A g(-1), indicating its potential application as an electrode material for supercapacitors.
三维（3D）基于石墨烯的复合材料由于其比表面积大、导电性和电子相互作用强而受到越来越多的关注。在这里，我们报告了一种制备 3D Co3O4/石墨烯水凝胶（CGH）复合材料的简便方法，将其用作超级电容器的电极材料。利用氧化石墨烯分散体的胶凝作用，可以将 Co3O4 纳米粒子锚定在石墨烯片表面上，并同时形成水凝胶。值得注意的是，球形 Co3O4 颗粒可以作为间隔物将相邻的石墨烯片隔开。CGH 在电流密度为 0.5 A g-1 时表现出 757.5 F g-1 的高比电容（Cs），表明其作为超级电容器电极材料的潜在应用。
