Applications
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• Energy storage devices
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- Ultracapacitors
Ultracapacitors fall between batteries and traditional electrolytic capacitors in their ability to store energy and deliver power.
The first successful ultracapacitors were based on electrochemical storage in the double layer near a high surface are material such as carbon aerogel. Since capacitance scales directly with surfaces area and inversely with distance, ions absorbed in the electrostatic double layers of there aerogels were only angstroms away from the surface producing capacity number orders of magnitude higher than traditional capacitors. These capacitors were called double layer ultracapacitors.
Somewhat later in time, newer pseudo capacitors utilizing materials such as RuO2, MnOx and NiOx were developed. These materials not only operate by means of double layer mechanisms but as well as through oxidation - reduction reactions. Our research group has worked with both MnOx and NiOx pseudo capacitors.
Lately, we have been using porous nanoparticulate sand -SiO2-, supported on inexpensive porous conducting carbon to store energy. We call these ¨Porous Oxide Electrolyte Membrane¨ (POEM) ultracapacitors. The figure to the left shows the effect of adding a thin-film (membrane) of SiO2 materials on the carbon supports. Once can notice the clear increase in capacitance related to our coatings. These technologies have been licensed by SolRayo CT and are currently being improved for a variety of applications.
Department of Environmental Chemistry and Technology, University of Wisconsin-Madison
660 North Park Street, Madison, WI 53706
contact us I +1-608-262-2674 I +1-608-446-8160 (cellular)
Professor Marc A. Anderson Lab of Sol-Gel Chemistry
welcome to our world of environmental technologies
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