Chinese Academy Of Sciences Graphene Supercapacitor Research Breakthrough

- Mar 17, 2017-

Recently, the Chinese Academy of Sciences Institute of Plasma Science, Institute of Plasma Physics, Wang Qi and Nanjing Normal University Professor Han Min task force in the high-performance heteroatom doping graphene nanostructures of large-scale preparation and its flexible all solid Supercapacitor applications have made new progress. Some of the research results have been published online in the international journal Small, and was selected as the magazine's InsideFrontCover.

In order to meet the growing demand for flexible and wearable electronic products, there is an urgent need to develop flexible all-solid-state power sources or energy storage devices. To achieve this goal, the key is to design and develop both excellent energy storage and mechanical properties of the electrode material. The presence of heteroatom dopant graphene and 2D layered metal sulfide (LMCs) nanostructures presents a new opportunity for the design of high performance electrode materials, but their energy storage properties (energy density, cycle stability, etc.) are still Need to be further improved. Whether the two types of materials can be "marriage" or coupling, thus developing high-performance electrode materials, is still a material science and chemical field of challenging issues.

In view of the above problems, Wang Qi and Han Min task group carried out cooperative research, using the controllable thermally converted oil amine wrapped SnS2-SnS mixed-phase nano-plate precursor strategy, cleverly organic molecules of carbonation, doping, phase conversion and (SG) and SnS hybrid nanosheets have been successfully synthesized and assembled in situ. The novel 3D porous SnS / SG hybrid nanostructures have been successfully realized by the self-assembly and other important physical and chemical processes. (HNAs, as shown in Figure 1). Compared with the traditional synthesis strategy, this method has the advantages of simple, high efficiency, good reproducibility and large scale preparation, which lays the foundation for extending and expanding the application of doping graphene materials in important technical fields such as clean energy, photoelectricity and sensing. The In the three-electrode system, KOH solution as the electrolyte, the obtained 3D graphene composite material mass ratio of up to 642Fg-1 (current density of 1Ag-1), much higher than the recently reported graphene complex and other electroactive materials ( Such as somatic and nanoscale SnS and its complexes, G-Mn3O4 nanorods, G-CoS2, 2DCoS1.07 / NC nanocomposites, etc.).

Subsequently, a flexible all-solid-state supercapacitor device ASSSCs was developed to exhibit excellent electrochemical energy storage performance: an area ratio of capacitance up to 2.98 mFcm-2, excellent long-range cycling stability (99% for10000cycles), excellent flexibility and mechanical Stability (which can be folded or bent more than 1000 times and the same performance), better than the reported graphene, 2DSnSe2 and SnSe and 3DGeSe2 nanostructured flexible ASSSCs.

This work presents a new strategy for in situ integration and assembly of 2D nanostructured units to construct 3D porous hybrid nanostructures or skeletal materials, and has the prospect of large scale preparation for future rational design of high performance hybrid electrode materials, development Flexible power sources or energy storage devices pave the way. In addition, by optimizing the design and combination, is also expected to extend the other types of multi-functional 3D porous skeleton material, follow-up work is ongoing.