Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy

Venkateshkumar Prabhakaran; Christopher G. Arges; Vijay Ramani

doi:10.1073/pnas.1114672109

Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy

Venkateshkumar Prabhakaran
, Christopher G. Arges
, Vijay Ramani

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

161 Scopus citations

Abstract

A fluorescent molecular probe, 6-carboxy fluorescein, was used in conjunction with in situ fluorescence spectroscopy to facilitate realtime monitoring of degradation inducing reactive oxygen species within the polymer electrolyte membrane (PEM) of an operating PEM fuel cell. The key requirements of suitable molecular probes for in situ monitoring of ROS are presented. The utility of using free radical scavengers such as CeO ₂ nanoparticles to mitigate reactive oxygen species induced PEM degradation was demonstrated. The addition of CeO ₂ to uncatalyzed membranes resulted in close to 100% capture of ROS generated in situ within the PEM for a period of about 7 h and the incorporation of CeO ₂ into the catalyzed membrane provided an eightfold reduction in ROS generation rate.

Original language	English (US)
Pages (from-to)	1029-1034
Number of pages	6
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	109
Issue number	4
DOIs	https://doi.org/10.1073/pnas.1114672109
State	Published - Jan 24 2012

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10.1073/pnas.1114672109

Cite this

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title = "Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy",

abstract = "A fluorescent molecular probe, 6-carboxy fluorescein, was used in conjunction with in situ fluorescence spectroscopy to facilitate realtime monitoring of degradation inducing reactive oxygen species within the polymer electrolyte membrane (PEM) of an operating PEM fuel cell. The key requirements of suitable molecular probes for in situ monitoring of ROS are presented. The utility of using free radical scavengers such as CeO 2 nanoparticles to mitigate reactive oxygen species induced PEM degradation was demonstrated. The addition of CeO 2 to uncatalyzed membranes resulted in close to 100\% capture of ROS generated in situ within the PEM for a period of about 7 h and the incorporation of CeO 2 into the catalyzed membrane provided an eightfold reduction in ROS generation rate.",

author = "Venkateshkumar Prabhakaran and Arges, \{Christopher G.\} and Vijay Ramani",

year = "2012",

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doi = "10.1073/pnas.1114672109",

language = "English (US)",

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pages = "1029--1034",

journal = "Proceedings of the National Academy of Sciences of the United States of America",

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Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy. / Prabhakaran, Venkateshkumar; Arges, Christopher G.; Ramani, Vijay.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 109, No. 4, 24.01.2012, p. 1029-1034.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy

AU - Prabhakaran, Venkateshkumar

AU - Arges, Christopher G.

AU - Ramani, Vijay

PY - 2012/1/24

Y1 - 2012/1/24

N2 - A fluorescent molecular probe, 6-carboxy fluorescein, was used in conjunction with in situ fluorescence spectroscopy to facilitate realtime monitoring of degradation inducing reactive oxygen species within the polymer electrolyte membrane (PEM) of an operating PEM fuel cell. The key requirements of suitable molecular probes for in situ monitoring of ROS are presented. The utility of using free radical scavengers such as CeO 2 nanoparticles to mitigate reactive oxygen species induced PEM degradation was demonstrated. The addition of CeO 2 to uncatalyzed membranes resulted in close to 100% capture of ROS generated in situ within the PEM for a period of about 7 h and the incorporation of CeO 2 into the catalyzed membrane provided an eightfold reduction in ROS generation rate.

AB - A fluorescent molecular probe, 6-carboxy fluorescein, was used in conjunction with in situ fluorescence spectroscopy to facilitate realtime monitoring of degradation inducing reactive oxygen species within the polymer electrolyte membrane (PEM) of an operating PEM fuel cell. The key requirements of suitable molecular probes for in situ monitoring of ROS are presented. The utility of using free radical scavengers such as CeO 2 nanoparticles to mitigate reactive oxygen species induced PEM degradation was demonstrated. The addition of CeO 2 to uncatalyzed membranes resulted in close to 100% capture of ROS generated in situ within the PEM for a period of about 7 h and the incorporation of CeO 2 into the catalyzed membrane provided an eightfold reduction in ROS generation rate.

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DO - 10.1073/pnas.1114672109

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AN - SCOPUS:84856390409

SN - 0027-8424

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SP - 1029

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JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

IS - 4

ER -

Investigation of polymer electrolyte membrane chemical degradation and degradation mitigation using in situ fluorescence spectroscopy

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