my country has successfully developed graphene supercapacitors that can be produced on a large scale

Chinese experts have successfully developed a flexible all-solid-state supercapacitor. This supercapacitor with high-performance heteroatom-doped graphene-based nanostructures has achieved a breakthrough in large-scale manufacturing for the first time.

This scientific research project was jointly completed by Dr. Wang Qi's group from the Institute of Plasma Physics, Hefei Institute of Material Science, Chinese Academy of Sciences and Nanjing Normal University professor Han Min's group. Part of the research results have been published online in the internationally renowned material science journal "Small".

In order to meet people's increasing demand for flexible 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 electrode materials with excellent energy storage and mechanical properties. The emergence of heteroatom-doped graphene and 2D layered metal sulfide (LMCs) nanostructures has brought new opportunities for the design of high-performance electrode materials, but its energy storage performance (energy density, cycle stability, etc.) Need to be further improved. Whether the above two types of materials can be effectively coupled to develop high-performance electrode materials is still a challenging subject in the fields of materials science and chemistry. In response to the above problems, the research group carried out cooperative research, using the strategy of SnS2-SnS miscible nanodisk precursors wrapped by controllable thermal conversion oleylamine, and skillfully carbonizing, doping, phase conversion and self-assembly of organic molecules. Integrating the physical and chemical processes of SnS, the first successful realization of the in-situ synthesis and assembly of sulfur-doped graphene (SG) and SnS hybrid nanosheets, a novel 3D porous SnS/SG hybrid nano-architecture (HNAs, such as Shown in Figure 1). Compared with traditional synthesis strategies, this method has the advantages of simplicity, high efficiency, good reproducibility, and large-scale preparation. It lays a foundation for extending and expanding the application of doped graphene materials in important technical fields such as clean energy, optoelectronics, and sensing. . In the three-electrode system, KOH solution is used as the electrolyte, and the mass specific capacitance of the 3D graphene composite material obtained is as high as 642 F g-1 (current density is 1 A g-1), which is much higher than the graphene composites and others reported recently. Electroactive materials (such as bulk and nano-scale SnS and its composites, G-Mn3O4 nanorods, G-CoS2, 2D CoS1.07/N-C nano hybrids, etc.). Subsequently, the flexible all-solid-state supercapacitor device ASSSCs (as shown in Figure 2) was further developed, showing excellent electrochemical energy storage performance: area specific capacitance as high as 2.98 mF cm-2, excellent long-term cycling stability (99%) for 10000 cycles), excellent flexibility and mechanical stability (can be folded or bent more than 1000 times without changing performance), better than the reported graphene, 2D SnSe2 and SnSe and 3D GeSe2 nanostructure-based flexible ASSSCs. This work proposes a new strategy for in-situ integration and assembly of 2D nanostructure units to construct 3D porous hybrid nanostructures or framework materials, and has the prospect of large-scale preparation, for the rational design of high-performance hybrid electrode materials in the future, and development Flexible power sources or energy storage devices pave the way.