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1 IntroductionElectrochemicalcapacitorsareuniqueenergystoragedevices ,whichexhibit2 0to2 0 0timesgreatercapacitancethanconven tionalcapacitors .Electrochemicalcapaci torscanbesimplyclassifiedintotwomaincategories:electricdouble layercapacitors(EDLCs) ,whi