Abstract:Accurate understanding of internal phenomena and their
feedback
is intrinsically important for improving the performance and durability
of proton exchange membrane fuel cells. The oxygen partial pressure
(p(O2)) at 10 μm from the cathode
catalyst layer (CL) in the gas diffusion layer was measured by using
an optical fiber with an oxygen-sensitive dye applied to the apex,
when the current density was abruptly increased. p(O2) decreased with increasing current density at constant
air utilization. This decrease i… Show more
“…Various attempts have been made to visualize water accumulation and transport in PEFCs using optical and spectroscopic techniques. [10][11][12][13] For instance, optical microscopy revealed the percolation, growth, and desorption of water droplets on the GDL surface and inside the gas/fluid channels. 14,15 Samples with small through holes in the GDL and MEA CL enabled observation of the hydration and mass transport within the internal structures.…”
In situ 3D computed tomography imaging with statistical analysis successfully revealed the water accumulation and drainage characteristics in the stacked gas diffusion layers and membrane electrode assembly of a PEFC.
“…Various attempts have been made to visualize water accumulation and transport in PEFCs using optical and spectroscopic techniques. [10][11][12][13] For instance, optical microscopy revealed the percolation, growth, and desorption of water droplets on the GDL surface and inside the gas/fluid channels. 14,15 Samples with small through holes in the GDL and MEA CL enabled observation of the hydration and mass transport within the internal structures.…”
In situ 3D computed tomography imaging with statistical analysis successfully revealed the water accumulation and drainage characteristics in the stacked gas diffusion layers and membrane electrode assembly of a PEFC.
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