Meng Xiaoqian, Deng Jin, Zhu Junwu, Bi Huiping, Kan Erjun, Wang Xin
Key Laboratory for Soft Chemistry and Functional Materials (Nanjing University of Science and Technology), Ministry of Education, Nanjing, 210094, China.
Sci Rep. 2016 Feb 16;6:21717. doi: 10.1038/srep21717.
Graphene and its composite hydrogels with interconnected three-dimensional (3D) structure have raised continuous attention in energy storage. Herein, we describe a simple hydrothermal strategy to synthesize 3D CoS/graphene composite hydrogel (CGH), which contains the reduction of GO sheets and anchoring of CoS nanoparticles on graphene sheets. The formed special 3D structure endows this composite with high electrochemical performance. Remarkably, the obtained 3D CGH exhibits high specific capacitance (C(s)) of 564 F g(-1) at a current density of 1 A g(-1) (about 1.3 times higher than pure CoS), superior rate capability and high stability. It is worth mentioning that this methodology is readily adaptable to decorating CoS nanoparticles onto graphene sheets and may be extended to the preparation of other pseudocapacitive materials based on graphene hydrogels for electrochemical applications.
具有相互连接的三维（3D）结构的石墨烯及其复合水凝胶在能量存储领域一直备受关注。在此，我们描述了一种简单的水热策略来合成3D硫化钴/石墨烯复合水凝胶（CGH），该策略包括氧化石墨烯片的还原以及硫化钴纳米颗粒在石墨烯片上的锚定。所形成的特殊3D结构赋予了这种复合材料高电化学性能。值得注意的是，所制备的3D CGH在1 A g(-1)的电流密度下表现出564 F g(-1)的高比电容（C(s)）（比纯硫化钴高约1.3倍）、优异的倍率性能和高稳定性。值得一提的是，这种方法易于将硫化钴纳米颗粒修饰到石墨烯片上，并且可能扩展到基于石墨烯水凝胶制备其他用于电化学应用的赝电容材料。
