Cerium Ion Mobility and Diffusivity Rates in Perfluorosulfonic Acid Membranes Measured via Hydrogen Pump Operation

Ion mobility and diffusivity coefficients were determined for cerium ions in Nafion XL perfluorosulfonic acid ionomer membranes at 100% and 50% relative humidity in a conductivity cell using a hydrogen pump. Ce ion migration profiles were quantified as a function of charge transfer through the cell...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Electrochemical Society 2017-01, Vol.164 (12), p.F1272-F1278
Main Authors: Baker, Andrew M., Babu, Siddharth Komini, Mukundan, Rangachary, Advani, Suresh G., Prasad, Ajay K., Spernjak, Dusan, Borup, Rod L.
Format: Article
Language:English
Subjects:
Energy Sciences
ENERGY STORAGE
fuel cells, cation, diffusivity, migration, durability
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ion mobility and diffusivity coefficients were determined for cerium ions in Nafion XL perfluorosulfonic acid ionomer membranes at 100% and 50% relative humidity in a conductivity cell using a hydrogen pump. Ce ion migration profiles were quantified as a function of charge transfer through the cell using X-ray fluorescence (XRF). In order to decouple simultaneous effects of Ce ion mobility and back-diffusion which occur due to potential and concentration gradients, respectively, a one-dimensional model was developed and fit to these intermittent XRF profiles. The resulting mobility and diffusivity coefficients demonstrate the dramatic effects of potential and concentration gradients on Ce ion migration during PEM fuel cell operation.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1221712jes