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23 (07.1.5)
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Measuring Conductivity of Proton Conductive Membrane in the direction of thickness, part II: using the 4-probe method in the direction of thickness |
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Abstract
Preceding reports have discussed the effects of interface complexity and contact quality between test membrane and electrodes, and have verified the feasibility of employing the 2-probe method for measuring ion conductivity in the direction of thickness. On the other hand, the 4-probe method can yield much more accurate measurements than the 2-probe method because it uses reference electrodes to sample electrical potentials on both sides of test membranes. This report will present results obtained using the 4-probe method in the direction of thickness for measuring the conductivity of ion exchange membranes. |
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20 (05.10.3)
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Measuring conductivity of proton conductive membranes in the direction of thickness |
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Abstract
Proton conductive membrane is generally evaluated by measuring its conductivity along the planes of the membrane. However, in view of the possibility of this membrane exhibiting anisotropy in the direction of membrane thickness compared to measuring along the longitudinal and transversal planes, the need to measure its conductivity in the direction of thickness has recently been receiving greater attention. The research work for this report is aimed at finding a way to stably and precisely measure the conductivity of a NafionŽ membrane in the direction of thickness. Measurements can be conducted with either 2- or 4-probe methods, but measuring with 2 probes is much easier than with 4, and this method yields more stable results as fewer inconsistencies occur with multiple specimens. This report presents the results with the 2-probe method for membrane conductivity measurements with an emphasis on the effect of interface complexity between membrane and electrodes and the feasibility of using this method for measurements. |
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