Researchers find 2-D transition metal carbides react with water, opening a door to their unknown chemistry

Researchers find 2-D transition metal carbides react with water, opening a door to their unknown chemistry
MXenes’ reactivity toward water is shown in this experiment where a Ti carbide MXene survives longer in an oxygen-saturated, non-aqueous system, in contrast to the same MXene dispersed in argon-saturated water. Credit: Shuohan Huang.

Researchers at Missouri S&T have discovered that two-dimensional (2-D) titanium carbide materials, or MXenes, can react with water with no other oxidizers involved. Their finding may lead to new insights into the unusual chemistry of MXenes and consequently have impacts on MXenes' storage and device manufacturing.

MXenes are one of the largest families of 2-D materials. They are a few atom-thick sheets with the structures of transition metal carbides and nitrides and with distinctive properties such as combined with their ability to disperse in water.

Researchers are excited about their potential use in and harvesting applications such as batteries, supercapacitors and triboelectric nanogenerators, which convert wasted frictional energy into electricity, according to Dr. Vadym Mochalin, associate professor of chemistry at Missouri S&T.

"The reactivity of MXenes toward water we've demonstrated not only changes the common perception about resistance of titanium carbide to hydrolysis in , but also points out the striking differences in between bulk and 2-D forms of the same material," says Mochalin.

Mochalin and lead author Shuohan Huang, a in chemistry working in Mochalin's research group at Missouri S&T, discuss their findings in "Hydrolysis of 2-D Transition–Metal Carbides (MXenes) in Colloidal Solutions," a paper published today in the American Chemical Society journal Inorganic Chemistry.

"Our new findings are important because now we know it is water itself rather than oxygen that MXenes need to be protected from during manufacturing and storage," says Huang.

To arrive at their "water-only" conclusion, Huang and Mochalin systematically tested the hydrolysis and chemical stability of MXenes Ti3C2Tx and Ti2CTx in water and non-aqueous colloidal solutions exposed to oxygen and/or inert gas environments in different combinations, as the example
shown in the image.

"It seems that in their 2-D state, transition metal carbides are quite reactive," says Mochalin. "With our result, we're looking forward to follow-up studies of their rich chemistry in reactions with water and other molecules, including organic compounds, as well as studies into MXenes' possible catalytic properties."


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More information: Shuohan Huang et al. Hydrolysis of 2D Transition-Metal Carbides (MXenes) in Colloidal Solutions, Inorganic Chemistry (2019). DOI: 10.1021/acs.inorgchem.8b02890
Journal information: Inorganic Chemistry

Citation: Researchers find 2-D transition metal carbides react with water, opening a door to their unknown chemistry (2019, January 17) retrieved 17 June 2019 from https://phys.org/news/2019-01-d-transition-metal-carbides-react.html
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