(489h) Solubilities and Diffusivities of Oxygen in Ionic Liquids for Electrochemical Applications | AIChE

Other Sites & Tools

Technical Groups

(489h) Solubilities and Diffusivities of Oxygen in Ionic Liquids for Electrochemical Applications

Authors 

Song, T. M. - Presenter, University of Notre Dame
Huang, K., Missouri University of Science and Technology
Morales, O., University of Notre Dame
Jia, H., Toyota Research Inistitute of North America
Brennecke, J. F., University of Notre Dame

Ionic liquids (ILs) have been
recognized as potential electrolytes for various electrochemical applications
due to their favorable properties, such as good ionic conductivity, tunable hydrophobicity, and controllable gas solubility.  In particular, protic
ionic liquids (PILs) have received considerable interest as proton transfer
media in proton exchange membrane fuel cells (PEMFC).

Previous researchers have shown that PILs with high O2
solubility enhance the oxygen reduction reaction (ORR) activity1-2;
therefore, the goal of this research is to design PILs with even higher O2
uptake in order to achieve better PEMFC performance. A series of PILs with
different fluoroalkyl chain lengths (shown below), all paired with the [MTBD]+
cation, were investigated. Here we present the O2 solubility and
diffusivity in these ILs, measured using a gravimetric microbalance. Other physical
properties, such as thermal stability, density, and viscosity, are also
reported.

Further, we compare the O2
solubility in the PILs to ILs we have designed for other applications3.
These ILs include [PP13][Tf2N], [PP12O1][Tf2N],
[Pyrro12O1][Tf2N], [DEME][Tf2N], [P2228][Tf2N], whose structures
are shown below. Additionally, the temperature dependence of O2
dissolution in the ILs is examined, to provide information on both the
interaction energy between the IL and O2, and the underlying driving
force for O2dissolution.

Figure
1. Structures of Investigated Ionic Liquids

References:

1.         Snyder,
J.; Livi, K.; Erlebacher, J., Oxygen Reduction Reaction Performance of
[MTBD][beti]_Encapsulated
Nanoporous NiPt Alloy Nanoparticles. Advanced Functional Materials 2013,
23 (44), 5494-5501.

2.         Snyder,
J.; Fujita, T.; Chen, M.; Erlebacher, J., Oxygen reduction in nanoporous
metalÐionic liquid composite electrocatalysts. Nature materials 2010,
9 (11), 904-907.

3.         Seo,
S.; Song, T. M.; Mizuno, F.; Takechi, K.; Brennecke, J. F., Influence of Ion
Diffusivity and Gas Solubility in Ionic Liquids on Li-Air Battery Performance. ECS
Transactions 2016, 75 (15), 147-160.

Topics 

Energy (Sustainability & Environment)

More Conference Links