Back to Search
Start Over
Tube-Super Dielectric Materials: Electrostatic Capacitors with Energy Density Greater than 200 J·cm -3 .
- Source :
-
Materials (Basel, Switzerland) [Materials (Basel)] 2015 Sep 17; Vol. 8 (9), pp. 6208-6227. Date of Electronic Publication: 2015 Sep 17. - Publication Year :
- 2015
-
Abstract
- The construction and performance of a second generation of super dielectric material based electrostatic capacitors (EC), with energy density greater than 200 J·cm <superscript>-</superscript> ³, 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.
Details
- Language :
- English
- ISSN :
- 1996-1944
- Volume :
- 8
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Materials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 28793561
- Full Text :
- https://doi.org/10.3390/ma8095301