Graphite acetylene is the only two-dimensional planar carbon material that can be synthesized under low temperature and atmospheric pressure and contains both sp and sp2 carbons. It is a new research field that Chinese scientists have led 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 conjugation system, excellent conductivity, and excellent The chemical stability, especially the abundant molecular channels, can provide more storage space and sites, which is conducive to the adsorption and transport of metals such as lithium and sodium. Therefore, graphite alkyne materials show excellent performance in a variety of energy storage devices. Comprehensive performance and huge application space. Graphyne's basic and applied research 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, applied graphite acetylene materials to lithium-ion batteries, sodium-ion batteries, and supercapacitors. , Lithium-sulfur batteries and other energy storage devices, and the structure-activity relationship between graphite acetylene material structure and electrochemical performance in-depth study (Figure 1).
The research group researched and developed a new type of boron-substituted graphyne, and through its combination of theoretical calculations and device performance characterization, the energy band structure, electrochemical performance, and sodium storage mechanism were analyzed in depth. Through theoretical calculations, research was conducted. The distribution of the energy levels of borax-graphite alkyne materials on the alkyne bond (sp carbon) and the central heteroatom (B), and further analysis of the energy level structure of the material and the transport performance exhibited in the experiment By combining the theoretical analysis results of the borane-based graphene acetylene bilayer configuration with 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 were investigated. Intrinsic connection between structures. The study found that the special chemisorption of boron atom on graphene acetylene can obtain high theoretical sodium storage capacity. Device test results also confirmed the use of boron-based graphite acetylene as the electrode material for sodium ion batteries. , With excellent overall performance, fully shows that this type of material has a strong application potential in the sodium-ion battery device, creating a new type of energy storage device electrode material research The new direction of the research. Selected 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 Chinese Academy of Sciences’ 100-Year Plan, and the Shandong Outstanding Youth Fund.
Figure 1. Application of Graphite Alkynes in Energy Storage Devices
Figure 2. Application of Boron Graphite Alkynes in Sodium Ion Batteries
