This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1016/j.electacta.2014.06.164 in citations.
In situ measurement of the oxygen in the cathode catalyst layer of a direct methanol fuel cell
In situ measurement of the oxygen in the cathode catalyst layer of a direct methanol fuel cell
We report an in situ measurement of the oxygen diffusion coefficient D ox in the cathode catalyst layer (CCL) of a direct methanol fuel cell (DMFC). The method is based on measuring two DMFC impedance spectra for the same cell current, but different oxygen concentrations in the cathode channel. T...
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Personal Name(s): | Wippermann, Klaus (Corresponding Author) |
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Klafki, Katja / Kulikovsky, Andrei | |
Contributing Institute: |
Technoökonomische Systemanalyse; IEK-3 |
Published in: | Electrochimica acta, 141 (2014) S. 212-215 |
Imprint: |
New York, NY [u.a.]
Elsevier
2014
|
DOI: |
10.1016/j.electacta.2014.06.164 |
Document Type: |
Journal Article |
Research Program: |
Fuel Cells |
Publikationsportal JuSER |
We report an in situ measurement of the oxygen diffusion coefficient D ox in the cathode catalyst layer (CCL) of a direct methanol fuel cell (DMFC). The method is based on measuring two DMFC impedance spectra for the same cell current, but different oxygen concentrations in the cathode channel. The spectra are fitted using a transmission line model to extract the CCL resistivity. The difference of two CCL resistivities for different oxygen concentrations determines D ox. We found View the MathML sourceDox=0.838×10−4·exp−EaR1T−1303 cm2 s−1 in the temperature range from 30 °C to 90 °C, with Ea ≃ 20.1 kJ mol−1. The activation energy is not far from that of the oxygen diffusion in Nafion; the value of this parameter is discussed. |