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Sci Rep. 2013;3:2572. doi: 10.1038/srep02572.

Supercapacitor operating at 200 degrees celsius.

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Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX-77005, USA.


The operating temperatures of current electrochemical energy storage devices are limited due to electrolyte degradation and separator instability at higher temperatures. Here we demonstrate that a tailored mixture of materials can facilitate operation of supercapacitors at record temperatures, as high as 200°C. Composite electrolyte/separator structures made from naturally occurring clay and room temperature ionic liquids, with graphitic carbon electrodes, show stable supercapacitor performance at 200°C with good cyclic stability. Free standing films of such high temperature composite electrolyte systems can become versatile functional membranes in several high temperature energy conversion and storage applications.

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