How Do Pseudocapacitors Utilize Fast Faradaic Reactions for High Capacitance?

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Stanley514
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There is such subclass of capacitors with name ''pseudocapacitors'' which seem to use ''fast faradaic reactions''. This type offers very high capacitance up to 7514 F/g, but relatively low voltage. http://www.nature.com/srep/2013/131018/srep02986/full/srep02986.html
What is faradaic reactions and could they have higher voltage?
 
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