  We present a principle and a simple theory of a novel reverse
electroactuator, in which the electrical current is generated by pumping of an
electrolytic liquid into nonwetting pores of a polarized electrode. The theory
establishes the relationship between the variation of external pressure and the
electrical current. The effective current density is amplified by high porosity
of the electrode. The suggested principle can be implemented into a design of a
shoe which will be generating an AC current simply by walking. Estimates of
typical parameters and operation regimes of such device suggest that one can
easily generate a peak current density of ~17 mA/cm2. This would produce some
1.7 A from each shoe at 0.65 W average power density, without hampering
walking.
