Reporters learned from Yanshan University on November 30 that the team of high inventions of the School of Environmental and Chemical Engineering of the University, in cooperation with American scientists, made important progress in the research of supercapacitors. Related results recently published in "Nature - Communications" magazine.
It is understood that the study uses low-temperature solvothermal method, one-step synthesis of nitrogen, fluorine co-doped graphitized carbon microspheres electrode material. Its ultra-high volumetric capacitance is three times that of commercial supercapacitor-based activated carbon, which is the highest reported carbon-based material. At the same time, the material remains very stable under high current charge and discharge.
The highlight of this synthesis is the use of nitrogen doping to generate pseudocapacitance to increase the capacitance, the use of fluorine doping enhances the electronic conductivity, and based on the synergistic effect of nitrogen and fluorine co-doping, improve the electron donor / acceptor properties of the material, Of carbon microspheres show a very high volumetric capacity, far more than other carbon-based materials. At the same time, the obtained carbon microspheres were charged and discharged 10,000 cycles at a current density of 5 A / g with almost no loss in capacitance, showing extremely high stability.
This work offers new ideas for designing new and efficient high volumetric capacity electrodes and is expected to play an important role in the development of compact energy storage devices.
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