  We discuss how the wettability of solid walls impacts electrokinetic
properties, from large systems to a nanoscale. We show in particular how could
the hydrophobic slippage, coupled to confinement effects, be exploited to
induce novel electrokinetic properties, such as a salt-dependent giant
amplification of zeta potential and conductivity, and a much more efficient
energy conversion. However, the impact of slippage is dramatically reduced if
some surface charges migrate along the hydrophobic wall under an applied field.
