Abstract
The net water drag coefficient (
α
NWD
) is supposedly an essential index in water management, and must be negative for system operation for polymer electrolyte fuel cell (PEFC) systems. In this study,
α
NWD
is carefully examined by measurement of the water content in the gases supplied to and those discharged from the cell/stack under gas supply conditions similar to those in a real PEFC system. We focus on the effect of anode hydrogen (H2) flow conditions (i.e., flow rate and relative humidity) on
α
NWD
under a constant flow condition of cathode air. Measured characteristics of current density (
i
)-
α
NWD
in which the relative humidity of discharged H2 from the anode is constant at around 100%, show that
α
NWD
is stable when
i
exceeds a certain threshold. The value of
α
NWD
in this stable region is particularly sensitive to changes in the stoichiometric ratio of H2. These measurements also suggest that in the
α
NWD
stable region, almost the entire area of the membrane is fully hydrated, and the effect of back diffusion on
α
NWD
becomes negligible. Analysis of the observed relationships between
α
NWD
and several variables indicate that increasing the H2 circulation flow rate effectively prevents anode dry-out.
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
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