In 1745, Ewald Georg von Kleist in Germany found that change could be stored by connecting a high voltage electronic generator by a wire to a volume of water in a hand-held glass jar. Von Kleist found that joining the wires resulted in a powerful spark, much more than an electrostatic machine. Charles Pollak was the inventor of the first electrolytic capacitor.
He found that the oxide layer on an aluminum anode would remain steady in a neither positive or negative, or alkaline electrolyte = even when the power was switched off. In 1896, he was granted US patent for an electric liquid capacitor with aluminum electrodes.
