New material combines properties of supercap and battery: Page 2 of 2

March 03, 2020 //By Christoph Hammerschmidt
New material combines properties of supercap and battery
A new class of materials can store electrical energy very quickly. These are two-dimensional titanium carbides, so-called MXenes. Like a battery, they store large amounts of electrical energy through electrochemical reactions - but unlike batteries, they can be charged and discharged in seconds. In cooperation with Drexel University, a team at the Helmholz-Zentrum Berlin (HZB) has shown how the capacity of such "pseudo-capacitors" can be increased by more than 50 percent.

They examined samples of pure MXene and MXene with embedded urea molecules and found dramatic differences: The presence of urea molecules significantly changes the electrochemical properties of MXene. The area capacity increased to 1100 mF/cm2, which is 56 percent higher than that of similarly prepared pure Ti3C2Tx electrodes.

The XAS analyses performed at the electron synchrotron at BESSY II showed that the surface chemistry is changed by the presence of the urea molecules. "At X-PEEM we could also observe the oxidation state of the Ti atoms on the Ti3C2Tx surfaces. This oxidation state increased due to the presence of urea, which could facilitate the storage of more energy," says Ameer Al-Temimy, who carried out the measurements as part of his doctoral thesis. This discovery should mean More storage capacity in less space - a property that is highly welcome in electronics.

Helmholtz Zentrum Berlin: https://www.helmholtz-berlin.de/index_en.html

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