  We look at the wetting of a pure fluid in contact with a charged flat
surface. In the bulk, the fluid is a classical van der Waals fluid containing
dissociated ions. The presence of wall and ions leads to strong
dielectrophoretic and electrophoretic forces that increase the fluid's density
at the wall. We calculate the fluid's profiles analytically and numerically and
obtain the energy integrals. The critical surface potential for prewetting is
obtained. In the phase diagrams, the line of first-order transition meets a
second-order transition line at a critical point whose temperature can be
higher or lower than the bulk critical temperature. The results are relevant to
droplet nucleation around charged particles in the atmosphere and could
possibly explain deviations from expected nucleation rates.
