Transition Metal Carbo-Chalcogenide "TMCC:" A New Family of 2D Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 35419882.
- Also identified by DOI 10.1002/adma.202200574.
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Abstract
Here, a new family of 2D transition metal carbo-chalcogenides (TMCCs) is reported, which can be considered a combination of two well-known families, TM carbides (MXenes) and TM dichalcogenides (TMDCs), at the atomic level. Single sheets are successfully obtained from multilayered Nb<sub>2</sub> S<sub>2</sub> C and Ta<sub>2</sub> S<sub>2</sub> C using electrochemical lithiation followed by sonication in water. The parent multilayered TMCCs are synthesized using a simple, scalable solid-state synthesis followed by a topochemical reaction. Superconductivity transition is observed at 7.55 K for Nb<sub>2</sub> S<sub>2</sub> C. The delaminated Nb<sub>2</sub> S<sub>2</sub> C outperforms both multilayered Nb<sub>2</sub> S<sub>2</sub> C and delaminated NbS<sub>2</sub> as an electrode material for Li-ion batteries. Ab initio calculations predict the elastic constant of TMCC to be over 50% higher than that of TMDC.