Colorful leaves, the scientific 'magic wand' light, turned into a positive capacitor of good performance.Reporters learned from Nankai University on the 5th, the school material science and Engineering Professor Zhou Zhen group of ordinary leaves in the campus as raw material preparation An efficient cathode material greatly enhances the overall performance of sodium ion capacitors, a result published in the latest issue of Advanced Functional Materials and funded by a National Key Research and Development Program.
According to reports, due to the high energy density of the battery and the super capacitor high power density advantages, sodium ion capacitor as a new type of energy storage devices and widespread concern.But the current sodium ion capacitor cathode material unit weight energy storage capacity is much smaller than Negative, in order to make both have the same amount of storage have had to make large and thick cathode, it is this point has greatly restricted the sodium ion capacitors in the field of energy storage widely .Zhou Zhen said that the existing sodium ion capacitor Commercial activated carbon as the cathode, their team unique, with pear leaves as raw material, successfully prepared with high specific surface area of biomass carbon material as the adsorption-positive.Compared with commercial activated carbon, this leaves prepared from biomass carbon material showed The anion fast adsorption and desorption characteristics and outstanding cycle stability, significantly improve the storage capacity of the capacitor and charge and discharge speed.
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, embedded as a negative electrode.The group will be the two materials through a reasonable match, Assembled into a sodium ion capacitor.The device exhibits high energy density, excellent power density and long cycle stability, and effectively solves the existing problems of positive and negative electrochemical reaction kinetic mismatch of capacitors, The successful drive of the mini fan experiment further proves that the sodium ion capacitor has a high voltage output.The results provide a new idea for the subsequent research and development of sodium ion capacitors and also provide the possibility for further practical application.
