2022
DOI: 10.1021/acsmeasuresciau.1c00058
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Gas Mass-Transport Coefficients in Ionomer Membranes Using a Microelectrode

Abstract: Gas permeability, the product of gas diffusivity and Henry's gas-absorption constant, of ionomer membranes is an important transport parameter in fuel cell and electrolyzer research as it governs gas crossover between electrodes and perhaps in the catalyst layers as well. During transient operation, it is important to divide the gas permeability into its constituent properties as they are individually important. Although transient microelectrode measurements have been used previously to separate the gas permea… Show more

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Cited by 8 publications
(6 citation statements)
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“…This range agrees with previous experimental data reported for the oxygen diffusivity in bulk Nafion membranes, even though there is a large variability among authors (three orders of magnitude) [35]. The large fluctuation of the diffusivity in bulk Nafion can be ascribed to conditioning, substrate interaction, and confinement of membranes [46][47][48]. The oxygen diffusivity considered here is a good approximation, which leads to realistic values of the local oxygen transport resistance.…”
Section: Calibrationsupporting
confidence: 90%
“…This range agrees with previous experimental data reported for the oxygen diffusivity in bulk Nafion membranes, even though there is a large variability among authors (three orders of magnitude) [35]. The large fluctuation of the diffusivity in bulk Nafion can be ascribed to conditioning, substrate interaction, and confinement of membranes [46][47][48]. The oxygen diffusivity considered here is a good approximation, which leads to realistic values of the local oxygen transport resistance.…”
Section: Calibrationsupporting
confidence: 90%
“…This range agrees with previous experimental data reported for the oxygen diffusivity in bulk Nafion membranes, even though there is a large variability among authors (three orders of magnitude) [25]. The large fluctuation of the diffusivity in bulk Nafion can be ascribed to conditioning, substrate interaction and confinement of membranes [36][37][38]. The oxygen diffusivity considered here is a good approximation, which leads to realistic values of the local oxygen transport resistance.…”
Section: Calibrationsupporting
confidence: 90%
“…Several of the issues raised in this work will be addressed in the future, including the followings: (1) the temperature-gradient-driven water transport will be added to the pressure-gradient-driven water transport in the cathode GDM, (2) the appropriately measured capillary pressure correlation of MPL and CL, (3) the relationship between oxygen diffusivity/solubility and water content of Nafion® will be investigated (some of this work is undergoing by other group 61 ), and (4) the depth of the hydrophobic region in the ultrathin Nafion® layer, which is underway through a collaboration with a group at NIST.…”
Section: Discussionmentioning
confidence: 99%