5 years ago

Detection of Reactive Oxygen Species in Anion Exchange Membrane Fuel Cells using In Situ Fluorescence Spectroscopy

Detection of Reactive Oxygen Species in Anion Exchange Membrane Fuel Cells using In Situ Fluorescence Spectroscopy
Shrihari Sankarasubramanian, Yunzhu Zhang, Vijay Ramani, Javier Parrondo
The objectives of this study were: 1) to confirm superoxide anion radical (O2.−) formation, and 2) to monitor in real time the rate of O2.− generation in an operating anion exchange membrane (AEM) fuel cell using in situ fluorescence spectroscopy. 1,3-Diphenlisobenzofuran (DPBF) was used as the fluorescent molecular probe owing to its selectivity and sensitivity toward O2.− in alkaline media. The activation energy for the in situ generation of O2.− during AEM fuel cell operation was estimated to be 18.3 kJ mol−1. The rate of in situ generation of O2.− correlated well with the experimentally measured loss in AEM ion-exchange capacity and ionic conductivity attributable to oxidative degradation. Super radicals: In situ fluorescence spectroscopy is used to confirm and detect the formation of superoxide anion radicals (O2.−) during operation of anion exchange membrane (AEM) fuel cells. The rate of generated radicals correlates well with the loss of ionexchange capacity and ionic conductivity of the AEM.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700760

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