Colorful leaves, the science of "magic wand" light, actually become a positive capacitor capacitor. Reporter learned from Nankai University on the 5th, the school materials science and Engineering Professor Zhou Zhen ordinary leaves in the campus as raw material, prepared highly efficient cathode material, greatly improving the overall performance of sodium ion capacitors. This achievement is published in the latest issue of "advanced functional materials" and is also funded by the state's key R & D projects.

According to reports, due to both high-density battery and super capacitor high power density advantages, sodium ion capacitors as a new energy storage device and widespread concern. However, the current sodium-ion capacitor cathode material weight per unit weight of energy storage is much smaller than the negative, in order to make both have the same amount of storage have to produce large and thick positive electrode, it is this greatly limited sodium-ion capacitor Wide application of energy storage. Zhou Zhen said that the existing sodium ion capacitors and more commercial activated carbon as cathode, their team unique, with pear leaves as raw materials, successfully prepared with high specific surface area of ​​biomass carbon material as the adsorbed positive. Compared with commercial activated carbon, this kind of biomass-based carbonaceous material prepared from leaves shows fast absorption and desorption characteristics and outstanding cycling stability to the anion, greatly improving the storage capacity and charging and discharging speed of the capacitor.

In addition, the group also through the electrospinning technology, the introduction of carbon nanotubes, titanium dioxide and carbon nanotubes designed and prepared uniformly dispersed in the carbon material nanorods, as embedded negative. Task group will be the two materials through a reasonable match, assembled into a sodium ion capacitor. The device shows a high energy density, excellent power density and long cycle stability, which effectively solves the existing problems of electrochemical mismatch between the positive and negative electrodes in the existing capacitors. By successfully driving the mini fan experiment, Further prove that the sodium ion capacitor has a high voltage output. The results provide a new idea for the follow-up research and development of sodium ion capacitors and also provide the possibility for further practical application.


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