Modeling the aging effects due to bubble coverage at the electrode in Anion Exchange Membrane Water Electrolysis
Résumé
This focuses on the decline in performance induced by the loss of wettability in the anode
Porous transport layer (PTL) due to extended bubble coverage. We performed a series of
multiple potentiometric tests including breaks every 10 hours combined with Electrochemical
Impedance spectroscopy. Using this protocol, we obtain the variation in reaction Kinetics,
Ohmic resistance and evolution of mass-transfer limit in the Anion Exchange Membrane
Water Electrolysis (AEMWE). Our goal was to study the evolution of concentration
overpotential in the AEMWE due to the variation in wettability. Our methodology was to
characterize the two-phase flow properties in the PTL that plays a key role in the
concentration overpotential at the electrode. It was performed using flow simulations with
Geodict using 3D tomographic images of the Stainless steel (SS) PTL at the anode. These
simulations were performed at the beginning of durability tests and the properties at the end
of life were determined using a modified contact angle. We obtain the effective permeability
of the medium to be implemented in the Darcy law as well as the capillary pressure at the
electrode, for beginning and end of durability tests. Subsequently, these properties were
implemented in our performance code to simulate the polarization curves at the beginning
and end of life.
Domaines
Sciences de l'ingénieur [physics]
Fichier principal
EFCF-2021_Paper_A0208_AEMWE_WettabilityAging_Ronit Kumar Panda_01.pdf (1)
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