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Materials 2015, 8(9), 6208-6227; doi:10.3390/ma8095301

Tube-Super Dielectric Materials: Electrostatic Capacitors with Energy Density Greater than 200 J·cm−3

1
Universidad Nacional de Colombia, Bogotá 111321, Colombia
2
Physics Department, Naval Postgraduate School, Monterey, CA 93943, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 30 June 2015 / Revised: 13 August 2015 / Accepted: 26 August 2015 / Published: 17 September 2015
(This article belongs to the Section Energy Materials)
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Abstract

The construction and performance of a second generation of super dielectric material based electrostatic capacitors (EC), with energy density greater than 200 J·cm3, 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. View Full-Text
Keywords: energy storage; capacitor; dielectric materials; titania nanotube arrays energy storage; capacitor; dielectric materials; titania nanotube arrays
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cortes, F.J.Q.; Phillips, J. Tube-Super Dielectric Materials: Electrostatic Capacitors with Energy Density Greater than 200 J·cm−3. Materials 2015, 8, 6208-6227.

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