Investigation into the space charge distribution near the interface between metallic electrode and dielectric liquid

The space charge and electric field distribution in dielectric liquids between electrodes are measured by using a Kerr electro-optic system. After DC field application for 1 h to nitrobenzene with Al electrodes, the electric field near the interface is enhanced by a factor of 3. In order to improve the electric field distribution near the interface, the electrode surfaces are coated with silicon varnish to form an electrode/solid insulator interface. The electric field and space charge distribution are greatly improved by using the insulation coating.