Integration of Ionogel Electrolytes with High Surface Area Carbon Papers for Flexible Supercapacitors.
Flores, Stephanie.
2013
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Abstract: Ionic
liquid based gels, or ionogels, are an attractive electrolyte option for flexible energy
storage devices. This is because the properties of ionic liquids (i.e., high ionic
conductivity, wide electrochemical window, and negligible vapor pressure) enable a
device architecture that can eliminate the heavy cases that encapsulate supercapacitors
used today. UV-polymerized ionogels ... read moreare found to have tunable mechanical properties in
addition to their favorable electrochemical properties. Their fabrication requires
exposure to UV light, which complicates integration with opaque carbon electrodes.
In-situ integration of UV polymerized ionogels with porous carbon electrodes is a field
that has been minimally explored due to the technical considerations of the ionogel's
curing process. Here we show that UV-polymerized ionogels - specifically, 16-wt%
poly(ethylene glycol) diacrylate (PEGDA) supported 1-ethyl-3-methyl imidazolium
bis(trifuoromethylsulfonyl)imide (EMI TFSI) gels - can be synthesized in situ on
commercial carbon papers in a coplanar architecture to yield a flexible supercapacitor
device. First, we have developed a methodology to fabricate and test UV-polymerized
ionogels with the most delicate of commercial carbon papers. Second, based on
electroanalytical testing, we have found that each carbon paper yields different
interfacial resistances between the neat ionic liquid (EMI TFSI) and its ionogel analog.
The results found here can be used as a decision-making tool in the selection of carbon
electrodes and UV-polymerized ionogels. Furthermore, it has provided a way to fairly
assess the wetting dynamics of different types of solid-state electrolytes with
different carbon electrodes without the need of a standardized electrochemical
cell.
Thesis (M.S.)--Tufts University, 2013.
Submitted to the Dept. of Chemical and Biological Engineering.
Advisor: Matthew Panzer.
Committee: Maria Flytzani-Stephanopoulos, and Tom Vandervelde.
Keywords: Chemical engineering, Electrical engineering, and Chemistry.read less - ID:
- hd76sb11f
- Component ID:
- tufts:21914
- To Cite:
- TARC Citation Guide EndNote
