High power density, short charge-discharge time, long cycle life... There are many advantages in talking about supercapacitors, but the current commercial supercapacitors on the market are generally low in capacity, affecting the widespread use of supercapacitors. Nanjing University of Technology has discovered a method for modifying electrode materials that will greatly increase the capacity of capacitors. This achievement has been published in the latest international authoritative publication "Advanced Materials".

As a new type of high-efficiency energy storage device, the super capacitor can be charged in just a few tens of seconds and has a service life of hundreds of thousands of times. At present, commercially available supercapacitors in the market use activated carbon electrodes, which have limited energy storage rates. The capacity of high-end supercapacitors in the market is only 1/12 of that of lithium batteries, which limits the application of supercapacitors. The metal oxide as the electrode material will have a theoretical capacity of 3 to 4 times more, but due to the poor electron and ion transmission performance, the actual application of the capacity is difficult to reach the theoretical height.

Professor Xia Hui of Nanjing University of Science and Technology's Institute of Nanotechnology has been trying to solve the bottleneck of capacity through material modification, that is, introducing or taking out some atoms or groups in the chemical structure of energy materials to improve the poor electricity of the material itself. Chemical properties.

In an experiment that failed to synthesize metal phosphides, the research team accidentally discovered an interesting modification method: a phosphate ion can surface a variety of metal oxide (such as osmium tetroxide, iron oxide, and nickel oxide) electrode materials. modified.

The phosphate ion regulates the surrounding electron environment of the metal ions on the surface of the electrode and the appearance of the porous ultra-thin nanosheets to facilitate ion transmission and increase the efficiency of the redox reaction, thereby increasing the capacity of the supercapacitor. The study will open up a new opportunity for the widespread use of supercapacitors. (Reporter Zhang Hao correspondent replaced)

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