Details
| Original language | English |
|---|---|
| Pages (from-to) | 153-162 |
| Number of pages | 10 |
| Journal | ECS Transactions |
| Volume | 98 |
| Issue number | 9 |
| Publication status | Published - 2020 |
| Event | Pacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200 - Honolulu, United States Duration: 4 Oct 2020 → 9 Oct 2020 |
Abstract
In this work, we use a method to separate the total oxygen mass transport coefficient into molecular, Knudsen, and ionomer contributions. Therefore, limiting current density measurements are carried out as a function of the diluent gas (He, N2, CO2), temperature (30, 50, 80 °C), relative humidity (50, 75, 100 %), and oxygen concentration (1, 3, 5, 7 %) using state of the art membrane electrode assemblies with three platinum loadings (0.05, 0.1, 0.15 mg/cm2). As expected, the molecular diffusion coefficient is independent of the platinum loading, but increases with temperature to a varying degree depending on the humidity level. On the other hand, the Knudsen diffusion coefficient increases with increasing electrochemical active surface area and temperature, and with decreasing relative humidity. The separation procedure includes a novel feature to isolate the ionomer mass transport resistance. Its interpretation as well as the method's reliability are critically questioned using operating condition dependencies.
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In: ECS Transactions, Vol. 98, No. 9, 2020, p. 153-162.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Development of an oxygen mass transport coefficient measurement and separation method for proton exchange membrane fuel cells
AU - Buehre, Lena Viviane
AU - Suermann, Michel
AU - Bethune, Keith
AU - Bensmann, Boris
AU - Hanke-Rauschenbach, Richard
AU - St-Pierre, Jean
N1 - Funding Information: Authors are grateful to General Motors for membrane/electrode assemblies, the Office of Naval Research for award N00014-17-1-2206, and Hawaiian Electric for supporting the Hawaii Sustainable Energy Research Facility operations.
PY - 2020
Y1 - 2020
N2 - In this work, we use a method to separate the total oxygen mass transport coefficient into molecular, Knudsen, and ionomer contributions. Therefore, limiting current density measurements are carried out as a function of the diluent gas (He, N2, CO2), temperature (30, 50, 80 °C), relative humidity (50, 75, 100 %), and oxygen concentration (1, 3, 5, 7 %) using state of the art membrane electrode assemblies with three platinum loadings (0.05, 0.1, 0.15 mg/cm2). As expected, the molecular diffusion coefficient is independent of the platinum loading, but increases with temperature to a varying degree depending on the humidity level. On the other hand, the Knudsen diffusion coefficient increases with increasing electrochemical active surface area and temperature, and with decreasing relative humidity. The separation procedure includes a novel feature to isolate the ionomer mass transport resistance. Its interpretation as well as the method's reliability are critically questioned using operating condition dependencies.
AB - In this work, we use a method to separate the total oxygen mass transport coefficient into molecular, Knudsen, and ionomer contributions. Therefore, limiting current density measurements are carried out as a function of the diluent gas (He, N2, CO2), temperature (30, 50, 80 °C), relative humidity (50, 75, 100 %), and oxygen concentration (1, 3, 5, 7 %) using state of the art membrane electrode assemblies with three platinum loadings (0.05, 0.1, 0.15 mg/cm2). As expected, the molecular diffusion coefficient is independent of the platinum loading, but increases with temperature to a varying degree depending on the humidity level. On the other hand, the Knudsen diffusion coefficient increases with increasing electrochemical active surface area and temperature, and with decreasing relative humidity. The separation procedure includes a novel feature to isolate the ionomer mass transport resistance. Its interpretation as well as the method's reliability are critically questioned using operating condition dependencies.
UR - http://www.scopus.com/inward/record.url?scp=85092648911&partnerID=8YFLogxK
U2 - 10.1149/09809.0153ecst
DO - 10.1149/09809.0153ecst
M3 - Conference article
AN - SCOPUS:85092648911
VL - 98
SP - 153
EP - 162
JO - ECS Transactions
JF - ECS Transactions
SN - 1938-6737
IS - 9
T2 - Pacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200
Y2 - 4 October 2020 through 9 October 2020
ER -