Title
Analysis of proton exchange membrane fuel cell polarization losses at elevated temperature 120 degrees C and reduced relative humidity
Abbreviated Journal Title
Electrochim. Acta
Keywords
proton exchange membrane fuel cells; polarization losses; elevated; temperature; reduced relative humidity; electrode ionic resistance; AC-IMPEDANCE SPECTROSCOPY; CATALYST LAYER; GAS-DIFFUSION; ELECTROCHEMICAL IMPEDANCE; IONIC-CONDUCTIVITY; PEMFC; CATHODE; OXYGEN; PERFORMANCE; ELECTRODES; Electrochemistry
Abstract
Polarization losses of proton exchange membrane (PEM) fuel cells at 120 degrees C and reduced relative humidity (RH) were analyzed. Reduced RH affects membrane and electrode ionic resistance, catalytic activity and oxygen transport. For a cell made of Nafion (R) 112 membrane and electrodes that have 35 wt.% Nafion (R) and 0.3 mg/cm(2) platinum supported on carbon, membrane resistance at 20%RH was 0.407 Omega cm(2) and electrode resistance 0.203 Omega cm(2), significantly higher than 0.092 and 0.041 Omega cm(2) at 100%RH, respectively. In the kinetically controlled region, 20%RH resulted in 96 mV more cathode activation loss than 100%RH. Compared to 100%, 20%RH also produced significant oxygen transport loss across the ionomer film in the electrode, 105 mV at 600 mA/cm(2). The significant increase in polarization losses at elevated temperature and reduced RH indicates the extreme importance of designing electrodes for high temperature PEM fuel cells since membrane development has always taken most emphasis. (c) 2006 Elsevier Ltd. All rights reserved.
Journal Title
Electrochimica Acta
Volume
52
Issue/Number
11
Publication Date
1-1-2007
Document Type
Article
Language
English
First Page
3525
Last Page
3533
WOS Identifier
ISSN
0013-4686
Recommended Citation
"Analysis of proton exchange membrane fuel cell polarization losses at elevated temperature 120 degrees C and reduced relative humidity" (2007). Faculty Bibliography 2000s. 7812.
https://stars.library.ucf.edu/facultybib2000/7812
Comments
Authors: contact us about adding a copy of your work at STARS@ucf.edu