Table 3. Formation Energies E_f (in eV) of the Lanthanide-based MXenes Terminated by the Fluorine and Hydroxyl Groups Based on Their Unit Cells.

M2CT2	T = F	T = OH
M = Ce	–14.8	–18.4
M = Pr	–16.1	–19.7
M = Nd	–18.1	–21.7
M = Sm	–24.6	–28.1
M = Eu	–22.2	–25.8
M = Gd	–31.7	–35.4
M = Tb	–27.6	–31.4
M = Dy	–24.1	–27.8
M = Ho	–20.5	–24.9
M = Er	–19.1	–22.8
M = Tm	–13.4	–20.4
M = Yb	–12.3	–16.1