Electrochemical Supercapacitor

Recent trends toward intermittent energy sources (e.g. wind and solar), advanced mobile devices and electric vehicles are placing increased demands on energy storage platforms. Electrochemical storage devices, in particular batteries and supercapacitors are two such devices with the potential to meet the energy storage demands of the future. Batteries are high energy capacity devices which store energy through redox reactions in the bulk material of the device. Supercapacitors are high power devices which store energy in the electrochemical double layer. Electric double layer capacitors (and pseudo capacitors) form the class of supercapacitors, which are also electrochemical energy storage devices but with different characteristics than battery. While the energy density of supercapacitors are much smaller than that of battery, the power density can be orders of magnitude higher because they can be charged and discharged very fast. Carbon materials are typically used as electrodes in electric double layer capacitors whereas oxides, hydroxides, chalcogenides and other electrode materials give pseudo-capacitance. We are currently developing and characterizing the performance of new materials for high-density energy storage.


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