In the scope of simple models analytical estimates of quantum capacitance for the infinite graphene sheet, graphene nanoribbon and carbon atoms chain (carbyne) are fulfilled. Non-monotonic dependence of on the electrostatic potential is demonstrated. Obtained results are compared with the calculations of the other authors.

In the scope of simple models analytical estimates of quantum capacitance for the infinite sheet, nanoribbon and chain of the 2D analogs of the compounds, having hexagonal structures (graphene-like compounds) are fulfilled. Non-monotonic dependence of on the electrostatic potential is demonstrated. Obtained results are compared with the calculations of the other authors.