Beka Lemu Girma, Li Xin, Wang Xiaoli, Han Chuanyu, Liu Weihua
School of Microelectronics, School of Electronic and Information Engineering, Xi'an Jiaotong University Xi'an 710049 P. R. China
RSC Adv. 2019 Aug 27;9(46):26637-26645. doi: 10.1039/c9ra05434k. eCollection 2019 Aug 23.
Graphene/transition metal hybrid electrode materials are considered promising electrode materials for supercapacitor applications. However, the stacking of graphene sheets and agglomeration of transition metal parts are still challenging issues to overcome in order to achieve the expected theoretical performances. Herein, a reduced graphene oxide/cobalt disulphide porous nanoparticle hybrid electrode material is fabricated using sulphur as the template precursor. The unique porosity derived from the sulphur template gives favourable open structures for easy diffusion of electrolyte ions and better accessible active sites, and free space for volume changes and results in improved electrochemical performance. In this hybrid material the graphene layers serve as a conductive matrix and physical support for pours cobalt sulphide nanoparticles. On the other hand, the porous cobalt sulphide redox-active material uniformly decorated on rGO can enhance the pseudocapacitive performance of the as synthesized hybrid material. Using the combined advantage of graphene and transition metal sulphide the as synthesized composite electrode material has excellent specific capacitance, excellent rate capability and cycling stability. Thus, our design approach can be considered as a potential candidate to design advanced energy storage devices.
石墨烯/过渡金属混合电极材料被认为是用于超级电容器应用的有前景的电极材料。然而，为了实现预期的理论性能，石墨烯片层的堆叠和过渡金属部分的团聚仍然是需要克服的挑战性问题。在此，以硫作为模板前驱体，制备了还原氧化石墨烯/二硫化钴多孔纳米颗粒混合电极材料。源自硫模板的独特孔隙率为电解质离子的轻松扩散和更好的可及活性位点提供了有利的开放结构，以及用于体积变化的自由空间，并导致电化学性能的改善。在这种混合材料中，石墨烯层用作多孔硫化钴纳米颗粒的导电基质和物理支撑。另一方面，均匀装饰在还原氧化石墨烯上的多孔硫化钴氧化还原活性材料可以增强所合成混合材料的赝电容性能。利用石墨烯和过渡金属硫化物的综合优势，所合成的复合电极材料具有优异的比电容、优异的倍率性能和循环稳定性。因此，我们的设计方法可被视为设计先进储能装置的潜在候选方案。
