Fig. 4

(a) The inequivalent adsorption sites in k-B₂C₃, labeled as C, B, H, and l. (b) Adsorption energies of a single Li/Na atom at the sites \({l}_{1}\),\({l}_{2}\), \({l}_{3},\) \({H}_{1}\), \({H}_{2},\) \({C}_{1}\), \({C}_{2}\), and \({B}_{1}\) on the k-B₂C₃ structure.