“…These important experimental achievements have triggered many further theoretical studies on supercapacity and alkalimetal ion battery properties of MXenes [26,129,[153][154][155][156][157][158][159][160][161][162][163][164][165][166][167]. In these theoretical studies, the effect of functionalization on mobility of various alkali-metals and ions (Li, Na, K, Ca) in pristine MXenes, Ti 2 C, Zr 2 C, V 2 C, Nb 2 C, Cr 2 C, Ti 2 N, V 2 N, Ta 2 N, Ti 3 C 2 , V 3 C 2 , and V 3 N 2 , as well as functionalized MXenes with F, O, OH, O, S, Se, and Te have been systematically studied.…”