  A methodology for substantially increasing the magnitude of the
electrokinetic streaming potential (Vs) from ~ 0.02 V to as large as ~ 1.6 V is
proposed. This is done through deploying textured, liquid-filled surfaces
(LFS), filled with low viscosity oils, for electrolyte flow. The charge density
at the electrolyte-oil interface as well as the enhanced slip may be
responsible for enhancement of the Vs. It was found, through experimental
analysis as well as computational simulations, that the fluid slip length was
inversely proportional to the filling oil viscosity, and influences the Vs. The
study provides new perspectives related to complex electrolyte flow conditions
as may be relevant for energy harvesting applications.
