NDLI: Voltage Oscillations in a Polymer Electrolyte Membrane Fuel Cell with Pd‐Pt/C and Pd/C Anodes

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Voltage Oscillations in a Polymer Electrolyte Membrane Fuel Cell with Pd‐Pt/C and Pd/C Anodes

Content Provider	Semantic Scholar
Author	Nogueira, Jéssica Alves Varela, Hamilton
Copyright Year	2017
Abstract	Polymer electrolyte membrane fuel cells (PEMFC) fed with H2 contaminated with CO may exhibit oscillatory behavior when operated galvanostatically. The self-organization of the anodic overpotential is interesting because it can be accompanied by an increase in the average performance. Herein we report experimental studies of voltage oscillations that emerge in a PEMFC equipped with a Pd/C or PdPt/C anode and fed with H2 contaminated with CO (100 ppm). We used on-line mass spectrometry to investigate how the mass fragments associated with CO2 and CO (m/z 44 and 28, respectively) varied with the voltage oscillations. Overall, we observed that oscillations in the anodic overpotential are in phase with that of the CO and CO2 signals. This fact is consistent with an autonomous adsorption-oxidation cyclic process. For both anodes, it has been observed that, in general, an increase in current density implies an increase in oscillatory frequency. By using CO stripping, we also discuss how the onset of CO oxidation is related to the maximum overpotential reached during a cycle, whereas the minimum overpotential can be associated with the catalytic activity of the electrode for H2 oxidation.
Starting Page	629
Ending Page	636
Page Count	8
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/2b/b0/OPEN-6-629.PMC5641910.pdf
PubMed reference number	29046857v1
Alternate Webpage(s)	https://doi.org/10.1002/open.201700098
DOI	10.1002/open.201700098
Journal	ChemistryOpen
Volume Number	6
Language	English
Access Restriction	Open
Subject Keyword	Carbon Dioxide Parkinson Disease Polymers RLN2 gene Tissue membrane enzyme activity oxidation part per million (ppm) voltage
Content Type	Text
Resource Type	Article

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