Investigation of PEM degradation kinetics and degradation mitigation using IN-SITU fluorescence spectroscopy and real-time monitoring of fluoride-ion release

Venkateshkumar Prabhakaran, Christopher G. Arges, Vijay Ramani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In-situ fluorescence experiments were performed with 6-carboxy fluorescein (6CFL) as the fluorescent molecular probe for monitoring reactive oxygen species (ROS) formation in an operating fuel cell. Modified rhodamine 6G (R6G) was used to prevent platinum-6CFL interactions (metal-dye interactions) during these measurements. ROS generated during fuel cell operation degrade the Nafion® membrane resulting in the release of fluoride ions. The concentration of fluoride was measured ex-situ in the effluent stream at regular time intervals and the trend of the ex-situ fluoride-ion concentration data mirrored the trend of the in-situ fluorescence data. The effect of relative humidity on ROS induced degradation was examined with the in-situ and ex-situ techniques. Lower relative humidities resulted in greater ROS induced degradation. Additionally, we report the modification of cerium (IV) oxide with doped nitrogen resulted in a sustained efficacy for free radical scavenging.

Original languageEnglish (US)
Title of host publicationPolymer Electrolyte Fuel Cells 12, PEFC 2012
PublisherElectrochemical Society Inc.
Pages935-944
Number of pages10
Edition2
ISBN (Print)9781607683506
DOIs
StatePublished - 2013
Event12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting - Honolulu, HI, United States
Duration: Oct 7 2012Oct 12 2012

Publication series

NameECS Transactions
Number2
Volume50
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting
Country/TerritoryUnited States
CityHonolulu, HI
Period10/7/1210/12/12

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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