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Chemical States of Water Molecules Distributed Inside a Proton Exchange Membrane of a Running Fuel Cell Studied by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy
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posted on 2020-05-22, 16:36 authored by Hiromichi Nishiyama, Shogo Takamuku, Katsuhiko Oshikawa, Sebastian Lacher, Akihiro Iiyama, Junji InukaiOn the performance
and stability of proton exchange membrane fuel
cells (PEMFCs), the water distribution inside the membrane has a direct
influence. In this study, coherent anti-Stokes Raman scattering (CARS)
spectroscopy was applied to investigate the different chemical states
of water (protonated, hydrogen-bonded (H-bonded) and non-H-bonded
water) inside the membrane with high spatial (10 μm φ
(area) × 1 μm (depth)) and time (1.0 s) resolutions. The
number of water molecules in different states per sulfonic acid group
in a Nafion membrane was calculated using the intensity ratio of deconvoluted
O–H and C–F stretching bands in CARS spectra as a function
of current density and at different locations. The number of protonated
water species was unchanged regardless of the relative humidity (RH)
and current density, whereas H-bonded water molecules increased with
RH and current density. This monitoring system is expected to be used
for analyzing the transient states during the PEMFC operation.
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PEMFC operationdensityWater MoleculesRHprotonated water speciesanti-Stokes Ramanchemical statesNafion membraneCARS spectramonitoring systemwater moleculesOperando Coherent Anti-Stokes Raman Scattering Spectroscopyproton exchange membrane fuel cellsintensity rationon-H-bonded watersulfonic acid groupFuel Cell StudiedH-bonded water moleculesProton Exchange Membranewater distributionchemical States
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