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Ink supercapacitor

15.09.2012

Researchers at Peking University have found that conventional ink can help create powerful supercapacitors. It turns out that ink can be an important component of flexible carbon fiber supercapacitors, which can be bent into a ring, for example, without losing performance.

Unlike conventional batteries, supercapacitors can deliver a large amount of energy in a short amount of time and also charge very quickly. Supercapacitors are used to reduce the load on the power grid during peak hours, as well as a source of energy for some types of public transport.

In batteries, electric current is formed as a result of a chemical reaction and the movement of charged ions, and in supercapacitors, electrons travel directly from one electrode to another. The main disadvantage of supercapacitors is the short duration of charge storage due to gradual self-discharge. Therefore, increasing the capacity of this energy source is of great importance.

Chinese scientists have created a supercapacitor by coating two long, thin carbon fibers with ink and then encasing them in a flexible plastic case filled with an electrolyte. As a result, it turned out that a layer of ink of just a few millimeters increases the capacitance of a supercapacitor by 10 times. The idea to use ink in supercapacitors came to the Chinese after they discovered that the ink contains carbon nanoparticles, which are ideal for storing charge. When applying ink to carbon electrodes, the area of electrical contact increases significantly - up to 27 square meters per gram of ink.

The researchers believe that a new type of supercapacitor will find wide application in wearable flexible electronics.

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