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@INPROCEEDINGS{Zhang:1021440,
author = {Zhang, Yufan and Kadyk, Thomas and Eikerling, Michael and
Agranvante, Gerard},
title = {{M}odelling {W}ater {P}henomenon in the {C}athode {S}ide of
{P}olymer {E}lectrolyte {F}uel {C}ells},
reportid = {FZJ-2024-00736},
year = {2023},
abstract = {Water exerts a crucial influence on the performance of a
polymer electrolyte fuel cell. as both “catalyst
activating agent” and “oxygen blocker”. Therefore,
fine-tuning the water distribution is imperative for high
performance. In this work, we present a water balance model
to calculate the distribution of liquid water in cathode
catalyst layer and diffusion media. The model incorporates
the influence of the local liquid water saturation on the
effective transport properties. Liquid water saturation is
both a composition variable determining the effective
properties, and a solution variable depending on the
solution of the transport equations that use the effective
properties. The model reveals the formation of a thin water
layer in the diffusion media (DM) adjacent to the cathode
catalyst layer (CCL). The interfacial water layer strongly
impedes oxygen transport and reduces the oxygen
concentration in CCL, which causes the knee-shape voltage
loss and drastically reduces the cell performance. We
elucidate the origin of the water layer, present parametric
studies of this effect, and propose mitigation strategies.
The fundamental understanding obtained will aid the
development of membrane electrode assemblies with tailored
pore network properties to achieve vital improvements in
performance.},
month = {Jul},
date = {2023-07-04},
organization = {Electrolyzer, Fuel Cell Forum 2023,
Luzern (Switzerland), 4 Jul 2023 - 7
Jul 2023},
subtyp = {Other},
cin = {IEK-13},
cid = {I:(DE-Juel1)IEK-13-20190226},
pnm = {1231 - Electrochemistry for Hydrogen (POF4-123)},
pid = {G:(DE-HGF)POF4-1231},
typ = {PUB:(DE-HGF)6},
url = {https://juser.fz-juelich.de/record/1021440},
}