Journal
JOURNAL OF POWER SOURCES
Volume 269, Issue -, Pages 344-362Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.06.146
Keywords
PEMFC; Pt anode; Carbon monoxide poisoning; Spatial EIS
Funding
- Office of Naval Research, United States [N00014-12-1-0496]
- Plan Promocio de la investigacio UNED [2011V/PUNED/0015, CYCIT DPI2007-61068]
- Hawaiian Electric Company of the Hawaii Sustainable Energy Research Facility
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This paper presents experimental and modeling results of the effect of low CO concentration (2 ppm) on the spatial performance of PEMFC as well as its spatial electrochemical impedance spectroscopy (EIS) responses. The cell was operated at constant current using various cathode gases: air, O-2 and H-2. Due to CO adsorption on the Pt anode and its poisoning, the cell voltage decreased and spatial current redistribution was observed. The steady state voltage losses were 0.089, 0.280 and 0.295 V for the H-2/O-2, Hz/air and H-2/H-2 gas configurations, respectively. EIS data revealed a pseudo-inductive behavior in the low frequency region for inlet segments of the cell operated under H-2/air and H-2/H-2 conditions. Operation with O-2 as an oxidant did not cause any pseudo-inductance. Analysis of the EIS and anode overpotential data suggested that CO oxidation occurred via chemical or electrochemical mechanisms, or a combination of both depending on the selected cathode gas. The spatial EIS data were analyzed using the equivalent electric circuits approach. The distributions of the equivalent electric circuit parameters are presented and discussed. A current distribution model and EIS interpolation technique were successfully applied for detailed analysis of CO effects on the spatial PEMFC performance and EIS. (C) 2014 Elsevier B.V. All rights reserved.
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