TY - GEN
T1 - Investigation of PEM degradation kinetics and degradation mitigation using IN-SITU fluorescence spectroscopy and real-time monitoring of fluoride-ion release
AU - Prabhakaran, Venkateshkumar
AU - Arges, Christopher G.
AU - Ramani, Vijay
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
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U2 - 10.1149/05002.0935ecst
DO - 10.1149/05002.0935ecst
M3 - Conference contribution
AN - SCOPUS:84885798051
SN - 9781607683506
T3 - ECS Transactions
SP - 935
EP - 944
BT - Polymer Electrolyte Fuel Cells 12, PEFC 2012
PB - Electrochemical Society Inc.
T2 - 12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting
Y2 - 7 October 2012 through 12 October 2012
ER -