Breakthrough in research on graphene-based supercapacitors of Chinese Academy of Sciences

Recently, Dr. Wang Qi, Ph.D., Institute of Plasma Physics, Hefei Institute of Material Science, Chinese Academy of Sciences, and Han Min, a professor at Nanjing Normal University, collaborated on the scale-up preparation of high-performance hetero atom-doped graphene-based nanostructures and their flexibility in all solid state. New progress has been made in the application of supercapacitors . Some of the research results have been published online in the international journal Small and selected as the magazine's InsideFrontCover.

To meet the growing demand for flexible wearable electronic products, there is an urgent need to develop flexible all-solid-state power sources or energy storage devices. The key to achieving this goal is to design and develop electrode materials that combine excellent energy storage and mechanical properties. The appearance 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. The ability to effectively "marriage" or couple these two types of materials to develop high-performance electrode materials is still a challenging subject in materials science and chemistry.

In response to the above problems, Wang Qi and Han Min's research group carried out a collaborative study, using the strategy of controlled thermal conversion of oleylamine-coated SnS2-SnS mixed-phase nanodisk precursors, subtly carbonizing, doping, phase-converting and organic molecules. In-situ synthesis and assembly of sulfur-doped graphene (SG) and SnS hybrid nanosheets were successfully integrated for the first time, and novel 3D porous SnS/SG hybrid nanostructures were obtained. (HNAs, as shown in Figure 1). Compared with the traditional synthesis strategy, the method has the advantages of simple and efficient, 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 with KOH solution as the electrolyte, the mass ratio of the obtained 3D graphene composite is as high as 642Fg-1 (current density is 1Ag-1), which is much higher than the recently reported graphene composites and other electroactive materials ( Such as bulk and nano-sized SnS and its complexes, G-Mn3O4 nanorods, G-CoS2, 2DCoS1.07/NC nanohybrids, etc.).

Subsequently, flexible all-solid-state supercapacitor devices ASSSCs were developed to exhibit excellent electrochemical energy storage performance: area ratio capacitance up to 2.98 mFcm-2, excellent long-range cycle stability (99% for 10000 cycles), excellent flexibility and mechanical Stability (can be folded or bent more than 1000 times without changing performance), better than reported graphene, 2DSnSe2 and SnSe and 3DGeSe2 nanostructured flexible ASSSCs.

This work proposes a new strategy for in-situ integration and assembly of 2D nanostructured units to construct 3D porous hybrid nano-architecture or framework materials, and has the prospect of large-scale preparation, rationally designing high-performance hybrid electrode materials for future development. A flexible power source or energy storage device paves the way. In addition, by optimizing the design and combination, it is expected to extend other types of multifunctional 3D porous framework materials, and follow-up work is underway.

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