Sources of Current Density Distribution in the Land-Channel Direction of a PEMFC
A proton exchange membrane fuel cell (PEMFC) was segmented to measure local current density, electrochemical surface area, and high frequency resistance (HFR) distribution in the land-channel direction at resolution of 350 μm. An in-house catalyst coated membrane of 3 mm × 3 mm active area was prepa...
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Published in | Journal of the Electrochemical Society Vol. 163; no. 9; pp. F1072 - F1083 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
The Electrochemical Society
01.01.2016
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Abstract | A proton exchange membrane fuel cell (PEMFC) was segmented to measure local current density, electrochemical surface area, and high frequency resistance (HFR) distribution in the land-channel direction at resolution of 350 μm. An in-house catalyst coated membrane of 3 mm × 3 mm active area was prepared to represent a small area in a larger scale cell with 1 mm land and channel widths. This design was employed to measure current density and HFR distribution at 60°C with several different operating conditions. Local electrical resistance was also measured separately so that local protonic resistances can be discerned from local HFR. To analyze the effect of the land-channel geometry a method was developed to quantify the sources of current distribution, such as distributions of oxygen concentration at the electrode, oxygen transport resistance, cathode catalyst layer resistance, and membrane water content. Current density distribution is strongly correlated with the distribution of membrane water content and electrode resistance in dry condition, and oxygen concentration distribution in wet condition, while in moderate condition both oxygen concentration and water content in membrane are critical to the local current density distribution. The results imply the limitation of uniform condition assumption used in a differential cell study. |
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AbstractList | A proton exchange membrane fuel cell (PEMFC) was segmented to measure local current density, electrochemical surface area, and high frequency resistance (HFR) distribution in the land-channel direction at resolution of 350 μm. An in-house catalyst coated membrane of 3 mm × 3 mm active area was prepared to represent a small area in a larger scale cell with 1 mm land and channel widths. This design was employed to measure current density and HFR distribution at 60°C with several different operating conditions. Local electrical resistance was also measured separately so that local protonic resistances can be discerned from local HFR. To analyze the effect of the land-channel geometry a method was developed to quantify the sources of current distribution, such as distributions of oxygen concentration at the electrode, oxygen transport resistance, cathode catalyst layer resistance, and membrane water content. Current density distribution is strongly correlated with the distribution of membrane water content and electrode resistance in dry condition, and oxygen concentration distribution in wet condition, while in moderate condition both oxygen concentration and water content in membrane are critical to the local current density distribution. The results imply the limitation of uniform condition assumption used in a differential cell study. |
Author | Tajiri, Kazuya Shrivastava, Udit N. |
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CitedBy_id | crossref_primary_10_1149_2_0021902jes crossref_primary_10_1016_j_enconman_2024_118533 crossref_primary_10_1002_aenm_202000623 crossref_primary_10_1016_j_ijhydene_2017_10_031 crossref_primary_10_3390_molecules25153387 crossref_primary_10_1021_acsami_0c10755 crossref_primary_10_1016_j_jpowsour_2017_03_058 crossref_primary_10_1016_j_electacta_2018_10_065 crossref_primary_10_1016_j_jpowsour_2017_03_155 crossref_primary_10_1016_j_ijhydene_2019_07_176 crossref_primary_10_1016_j_ecmx_2023_100478 crossref_primary_10_1016_j_apenergy_2024_123332 crossref_primary_10_1016_j_ijhydene_2022_07_228 crossref_primary_10_1149_1945_7111_abb8f8 crossref_primary_10_1149_2_0271907jes crossref_primary_10_1016_j_xcrp_2022_101083 |
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