The through-plane thermal conductivity and the contact resistance of the components of the membrane electrode assembly and gas diffusion layer in proton exchange membrane fuel cells
“…al., (2014) have conducted the experiment setup using steady state method, developing the measure the through-plane thermal conductivity of the components in PEM and GDL at the different operating temperature. The thermal conductivities of the GDLs are investigated as a function of the PTFE loading, temperature and compression pressure (Alhazmi et al, 2014).…”
Section: Measurement the Through Plane Thermal Conductivity Of The Pementioning
confidence: 99%
“…Then, the variation in thickness is almost negligible after increasing the pressure which indicates that the deformation of the GDL has "saturated". Alhazmi et al, (2014) claimed that there is a hysteresis effect in the compression curves which signals that there has been a permanent deformation in the compressed GDL sample. In Figure 2.8, shows the investigated effect of the applied load on the thermal resistance.…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…It is clear that the thermal resistance values of the treated GDLs are higher than that of the untreated GDL. This is due to the increase in the contact resistance between the fibers of the GDL after adding the PTFE (Khandelwal et al, 2006) (Alhazmi et al, 2014). (Alhazmi et al, 2014) 2.9.2 Effect of the temperature on the through-plane thermal conductivity in the PEM Figure 2.9 shows that the thermal conductivity of Nafion® decreases with increasing temperature, where the test temperature is defined as the average temperature across the test specimen.…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…This is due to the increase in the contact resistance between the fibers of the GDL after adding the PTFE (Khandelwal et al, 2006) (Alhazmi et al, 2014). (Alhazmi et al, 2014) 2.9.2 Effect of the temperature on the through-plane thermal conductivity in the PEM Figure 2.9 shows that the thermal conductivity of Nafion® decreases with increasing temperature, where the test temperature is defined as the average temperature across the test specimen. Although the downward trend in thermal conductivity is nearly within the error bar limit, this behavior of Nafion® may be explained on the basis of its structure and morphology (Chun et al, 1998) (Zhang et al, 2006).…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…The through-plane thermal conductivity of the GDL increasing with the temperature (Nikooee et al, 2011). function of the temperature for dry Nafion ® membrane (N112 and N117), error bar calculated at 15% (Alhazmi et al, 2014) …”
Section: Effect Of the Temperature On The Through-plane Thermal Condumentioning
“…al., (2014) have conducted the experiment setup using steady state method, developing the measure the through-plane thermal conductivity of the components in PEM and GDL at the different operating temperature. The thermal conductivities of the GDLs are investigated as a function of the PTFE loading, temperature and compression pressure (Alhazmi et al, 2014).…”
Section: Measurement the Through Plane Thermal Conductivity Of The Pementioning
confidence: 99%
“…Then, the variation in thickness is almost negligible after increasing the pressure which indicates that the deformation of the GDL has "saturated". Alhazmi et al, (2014) claimed that there is a hysteresis effect in the compression curves which signals that there has been a permanent deformation in the compressed GDL sample. In Figure 2.8, shows the investigated effect of the applied load on the thermal resistance.…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…It is clear that the thermal resistance values of the treated GDLs are higher than that of the untreated GDL. This is due to the increase in the contact resistance between the fibers of the GDL after adding the PTFE (Khandelwal et al, 2006) (Alhazmi et al, 2014). (Alhazmi et al, 2014) 2.9.2 Effect of the temperature on the through-plane thermal conductivity in the PEM Figure 2.9 shows that the thermal conductivity of Nafion® decreases with increasing temperature, where the test temperature is defined as the average temperature across the test specimen.…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…This is due to the increase in the contact resistance between the fibers of the GDL after adding the PTFE (Khandelwal et al, 2006) (Alhazmi et al, 2014). (Alhazmi et al, 2014) 2.9.2 Effect of the temperature on the through-plane thermal conductivity in the PEM Figure 2.9 shows that the thermal conductivity of Nafion® decreases with increasing temperature, where the test temperature is defined as the average temperature across the test specimen. Although the downward trend in thermal conductivity is nearly within the error bar limit, this behavior of Nafion® may be explained on the basis of its structure and morphology (Chun et al, 1998) (Zhang et al, 2006).…”
Section: Effect Of Compression Pressure On the Through-plane Thermalmentioning
confidence: 99%
“…The through-plane thermal conductivity of the GDL increasing with the temperature (Nikooee et al, 2011). function of the temperature for dry Nafion ® membrane (N112 and N117), error bar calculated at 15% (Alhazmi et al, 2014) …”
Section: Effect Of the Temperature On The Through-plane Thermal Condumentioning
This work proposes new and accurate systematic methodologies for ex situ measurements of through‐plane thermal and in‐plane electronic conductivities of catalyst layers (CLs) of polymer electrolyte membrane fuel cells (PEMFC). The developed methods are based on measurements of different thicknesses/lengths of a CL on different substrates. Suitability of the proposed methods is confirmed through a set of microstructural properties measurements on a typical CL design to ensure the measured CLs would be representative of CLs in a real fuel cell product. Conductivity measurements of two CL designs with different compositions and microstructures confirm capability of the developed procedures to track structural changes in CLs. The present characterization platform is not limited to CLs and may be used for other composite porous materials with similar structures.
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