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Transition Metal Carbo‐Chalcogenide “TMCC:” A New Family of 2D Materials

https://doi.org/10.1002/adma.202200574

Majed, Ahmad ; Kothakonda, Manish ; Wang, Fei ; Tseng, Eric N. ; Prenger, Kaitlyn ; Zhang, Xiaodong ; Persson, Per O. Å. ; Wei, Jiang ; Sun, Jianwei ; Naguib, Michael ( May 2022 , Advanced Materials)

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 Nb₂S₂C and Ta₂S₂C 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 Nb₂S₂C. The delaminated Nb₂S₂C outperforms both multilayered Nb₂S₂C and delaminated NbS₂as 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.

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