Graphite acetylene is the only two-dimensional planar carbon material that can be synthesized at low temperatures and pressures, and contains both sp and sp2 carbons. It is a new research field that Chinese scientists have pioneered internationally. Intellectual property. At present, graphyne has achieved rapid macro-preparation of samples and controllable preparation of large-area, high-quality thin films of 100 square centimeters (Fig. 1). Graphyne has a large conjugated system, excellent electrical conductivity, and excellent chemical stability. In particular, the rich molecular channels can provide more storage space and sites, which is conducive to the adsorption and transport of lithium and other metals. Therefore, graphite alkyne materials exhibit excellent overall performance and enormous application space in various energy storage devices. The basic and applied research of graphyne has always attracted the attention of scientists from all over the world.
Recently, under the guidance of Li Yuliang, an academician of the Chinese Academy of Sciences, the carbon-based materials and energy application research group led by Huang Changshui, researcher of the Qingdao Institute of Bioenergy and Process, Chinese Academy of Sciences, has applied graphite acetylene materials to lithium ion batteries, sodium ion batteries, and supercapacitors in succession. A variety of energy storage devices, such as lithium-sulfur batteries, and the structure-activity relationship between the structure and electrochemical properties of graphite alkyne materials have been studied in depth (Figure 1).
The research group developed and prepared a new type of boron-substituted graphyne, and further analyzed its band structure, electrochemical performance, and sodium storage mechanism by means of theoretical calculations and device performance characterization. Through theoretical calculations, the distribution of the energy levels of the boron-substituted graphitic alkyne materials on the alkyne bond (sp carbon) and the center heteroatom (B) was studied, and the energy level structure of this class of materials was further analyzed and demonstrated in the experiment. The relationship between transport performance. Based on the theoretical analysis results of the borane graphene bilayer arrangement configuration and the XRD scattering angle obtained in the experiment and the pore size and distribution of the molecular channel, the borane graphene molecular structure and the molecular plane packing method as well as the pore size structure are discussed. The inner connection. It has been found that the special chemisorption effect of boron-substituted graphite alkyne on sodium atoms can obtain a very high theoretical sodium storage capacity. The device test results also confirmed that the sodium ion battery with boron-substituted graphite alkyne as the electrode material has excellent comprehensive performance, which fully shows that this type of material has a strong application potential in the sodium-ion battery device, and creates a new type of energy storage device electrode. The new direction of material research. The relevant research results were selected as VIP articles published in "German Applied Chemistry".
The research work was supported by the National Natural Science Foundation of China, the “Hundred Talents Program†of the Chinese Academy of Sciences, and the Outstanding Youth Fund of Shandong Province.
Figure 1. Application of Graphite Alkynes in Energy Storage Devices
Figure 2. Application of Boron Graphite Alkynes in Sodium Ion Batteries
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