Tube-Super Dielectric Materials: Electrostatic Capacitors with Energy Density Greater than 200 J cm ˉ³
Quintero Cortes, Francisco Javier
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The construction and performance of a second generation of super dielectric material based electrostatic capacitors (EC), with energy density greater than 200 J cm ˉ³, which rival the best reported energy density of electric double layer capacitors (EDLC), also known as supercapacitors, are reported. The first generation super dielectric materials (SDM) are multi-material mixtures with dielectric constants greater than 1.0 10⁵, composed of a porous, electrically insulating powder filled with a polarizable, ion-containing liquid. Second-generation SDMs (TSDM), introduced here, are anodic titania nanotube arrays filled with concentrated aqueous salt solutions. Capacitors using TiO₂ based TSDM were found to have dielectric constants at ~0 Hz greater than 10⁷ in all cases, a maximum operating voltage of greater than 2 volts and remarkable energy density that surpasses the highest previously reported for EC capacitors by approximately one order of magnitude. A simple model based on the classic ponderable media model was shown to be largely consistent with data from nine EC type capacitors employing TSDM.
The article of record as published may be found at http://dx.doi.org/10.3390/ma8095301
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