Home > News > Advanced functional materials: Ramie "Metamorphosis" three dimensional porous carbon fiber for energy storage

Advanced functional materials: Ramie "Metamorphosis" three dimensional porous carbon fiber for energy storage

wallpapers News 2020-11-17

with the development of society the rapid consumption of non renewable fossil energy the deteriorating environment make people continue to develop high-performance low-cost electrochemical energy storage devices to meet the needs of future energy storage. Biomass energy has attracted more more attention because of its renewable wide sources. The source of natural ramie production is Dazhu County Dazhou City Sichuan Province the hometown of Professor Yang Weiqing. Its output accounts for 80% of the whole country the growth rate of ramie is fast (three seasons a year). Ramie has a long history in the traditional textile industry but the development of high value-added advanced materials is still blank. The research development of natural ramie for energy storage devices can meet the power supply of new urban rail transit vehicles energy recovery high-power start stop of urban transportation which is of great significance to promote the rapid development of new energy rail transit. At present we really cooperate with related companies plan to invest 30 million yuan for the achievement transformation of mass production of natural ramie high specific energy supercapacitor. The molecular pre embedding technology hierarchical double vacancy defect construction platform proposed in this paper are of great significance for the research application of high energy density energy storage devices.

Yang Weiqing research group of School of materials Southwest Jiaotong University successfully prepared highly interconnected three-dimensional porous carbon fibers (dacfs) through molecular pre embedding technology hierarchical double vacancy defect construction platform described its mechanism in detail. Different from the widely studied KOH grinding high temperature activation they used molecular pre embedding technology to rivet KOH molecules into ramie fiber. In the process of high temperature activation Koh preferentially reacts with C atom on cellulose Oh to form vacancy. At the same time the introduction of CO2 is easier to react with the C atom on - C-C - to form vacancies. The results show that the three-dimensional porous carbon fiber with double vacancy defects not only has a relatively high specific surface area of 1529 m2g-1 but also has a suitable pore size distribution. The researchers further fabricated button type supercapacitors based on porous carbon fiber. In the emimbf4 ionic liquid electrolyte system the device exhibits a mass specific capacitance of 38.2 f / g an energy density of 61.3 wh kg − 1 (corresponding to a power density of 875 w kg − 1). (Wang Qing the first author of this paper master's degree student corresponding author Yang Weiqing)

researchers believe that the molecular pre embedding technology hierarchical double vacancy defect construction technology proposed in this study will provide some solutions for vacancy construction of carbon nanomaterials on the one h open a new window for riveting of metal nanoparticles embedded in porous carbon materials oxidizable mxenes unstable perovskite materials on the other h.


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