Pseudocapacitive random and aligned nano-porous electrode materials for supercapacitors

B. Saruhan, Y. Gönüllü, B. Arndt
German Aerospace Center, DE

Keywords: supercapacitors, pseudo-capacitance, nano-porous, metal oxides

Summary:

Commercial electric double layer capacitors store energy in an electric field. This is caused by charged particles arranged on two electrodes consisting mostly of carbon, in the form of a double layer. Such double layer capacitors exhibit a low energy density, so that components with large capacity according to large electrode areas are required. Our research focuses on the development of electrode materials to realize the production of electrical energy storage systems with high energy density and high power density. Metal oxide based electrodes increase the energy density and the capacitance by addition of pseudo capacitance to the static capacitance present by the double layer super-capacitor electrodes. The so-called hybrid capacitors combine both types of energy storage in a single component. In this talk, an introduction to the area of super-capacitors and its applications to various areas of energy management will be given. The production routes followed in our laboratories will be described and those with the literature compared. Our studies concentrate on composites electrodes having metal-oxides and CNT and hierarchically aligned nano-porous metal oxides combined with redox oxides. The material specific and electrochemical properties achieved with these electrodes will be presented.