Cerium Ion Mobility and Diffusivity Rates in Perfluorosulfonic Acid Membranes Measured via Hydrogen Pump Operation. Issue 12 (1st January 2017)

• Record Type: Journal Article
• Authors: Baker, Andrew M.; Babu, Siddharth Komini; Mukundan, Rangachary; Advani, Suresh G.; Prasad, Ajay K.; Spernjak, Dusan; Borup, Rod L.
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 12(2017)
• Page Start: F1272
• Page End: F1278
• Publication Date: 2017-01-01
• Subjects: durability -- fuel cells -- PEM; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1221712jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : 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.