  In this review, we shortly summarize the basic theoretical milestones
achieved in the mean-field theory of room temperature ionic liquids (RTILs) on
charged electrodes since the publication of Kornyshev's seminal paper in 2007.
We pay special attention to the behavior of the differential capacitance
profile and the microscopic parameters of ions that can have substantial
influence on it. Among them are parameters of short-range specific
interactions, ionic diameters, static polarizabilities, and permanent dipole
moments. We also discuss the recent "nonlocal" mean-field theories that can
describe the overscreening behavior of the local ionic concentrations, as well
as the crossover from overscreening to crowding.
