The Research Group of Carbon-Based Materials and Energy Applications of Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences found that through the molecular design of graphyne carbon materials to control the number of acetylenic bonds, more sodium storage sites and transmission channels were added to prepare Sodium storage materials with better electrochemical performance, their excellent specific capacity and ultra-long cycle stability indicate that graphyne carbon materials have great application potential in energy storage. Because sodium is abundant in the world and is cheap and readily available, the cost of sodium ion batteries and capacitors is significantly reduced compared to lithium ion batteries. Especially for large energy storage devices, sodium ion batteries and capacitors have more sustainable advantages. Therefore, the research of sodium ion batteries has quickly attracted the attention of scientific researchers all over the world. However, the specific capacity that commercial graphite can provide as a negative electrode material for sodium ion batteries and capacitors is too low, which seriously restricts the further development of sodium ion batteries and capacitors. For this reason, research groups around the world have begun to explore new types of negative electrode materials Research work, including the development and exploration of new carbon-based materials. Graphite carbide, hard carbon, graphene, etc. developed in recent years are used as negative electrode materials for sodium ion batteries and capacitors. They have the advantages of low cost, low potential, and large capacity. They are considered to be promising candidates. However, the low capacity and cycle stability that are common to these carbon anodes are always problems that need to be improved. The carbon-based materials and energy application research group has long been devoted to the research of sodium ion batteries and capacitor electrode materials, and developed and prepared graphene based sodium ion batteries and capacitor negative materials. With its own characteristics of rich acetylene bonds, graphene negative electrodes are In terms of sodium storage, it exhibits more excellent electrochemical performance, including that porous graphyne is directly applied to the negative electrode of sodium ion batteries (J. Mater. Chem. A 2017, 5, 2045-2051), and nitrogen-doped graphyne achieves both high power Density and energy density of sodium ion capacitors (ChemElectroChem 2018, 5, 1435-1443), graphite alkyne nanowall obtained high performance sodium ion capacitors (ACS Appl. Mater. Interface, 2017, 9, 40604-40613). On this basis, through the molecular design of graphyne, the introduction of hydrogen elements and the preparation of hydrogen-substituted graphyne carbon materials with uniform defects, and these introduction of hydrogen-substituted graphyne has shown higher performance in sodium storage The theoretical specific capacity (> 1200 mAh g-1) and experimental specific capacity (> 600 mAh g-1), as well as the cycle stability performance with excellent rate performance (Nat. Commun., 2017, 8, 1172). Especially recently, the research group designed and prepared hydrogen substituted graphyne (HsGY), in which a large number of large pores and mesoporous structures of acetylene bonds are conducive to the rapid penetration of the electrolyte, shortening its diffusion and transmission path, and improving the rate performance of the electrode And cycle stability (as shown). At a current density of 100 mAh g-1, the HsGY electrode can achieve a high reversible specific capacity of up to 680 mAh g-1. Even at a current density of up to 5000 mA g-1, the specific capacity of the HsGY electrode can still be stabilized at 330 mAh g-1. Thanks to the characteristics of the HsGY electrode material that has both two-dimensional and three-dimensional layered porous materials, sodium ions can be stored in large amounts in and out of the plane of HsGY, and sodium ions can be easily diffused in the HsGY layer or migrated through . Stability testing shows that the reversible capacity can be stabilized at 320 mAh g-1 with a current density of 5000 mAh g-1 for 5900 cycles, resulting in an excellent capacity retention rate of 96%. Related results have been published in the international journal "Journal of Materials Chemistry A" (J. Mater. Chem. A (2019, 7, 11186-11194)). The above research results have important guiding significance for the design, preparation, energy storage and catalysis of new carbon-based materials, and at the same time show that graphyne carbon materials have great potential in the development and application of energy equipment. The research was supported by the National Natural Science Foundation of China, the Frontier Key Project of the Chinese Academy of Sciences, and the Shandong Natural Science Foundation. Figure: HsGY and its electrochemical performance. (a) Rate performance, (b) schematic diagram of sodium ion storage, (c) schematic diagram of sodium ion migration path, (d) cycle performance. The illustration is the assembled SIBs to keep the LED device continuously lit. 3L Electric Wallpaper Stripper
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