Effects of Pt loading in the anode on the durability of a membrane–electrode assembly for polymer electrolyte membrane fuel cells during startup/shutdown cycling
A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by the oxygen reduction reaction (ORR) induced at the anode with a hydrogen/air boundary during startup/shutdown processes. With an increase in th...
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Published in | International journal of hydrogen energy Vol. 37; no. 23; pp. 18455 - 18462 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
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01.12.2012
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Abstract | A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by the oxygen reduction reaction (ORR) induced at the anode with a hydrogen/air boundary during startup/shutdown processes. With an increase in the reverse current, the degradation rate of the cathode that experiences a highly corrosive condition (locally high potential) increases. In this work, the anode Pt loading is decreased from 0.4 to 0.1 mg cm−2 to decrease the reverse current. The decrease in the anode Pt loading is found to decrease the hydrogen oxidation rates (HOR) during normal operation, but this loading decrease barely affected the cell performance. However, a decrease in the anode Pt loading can significantly decrease the reverse current, leading to a diminished cathode degradation rate during startup/shutdown cycling. It is revealed by slow decreases in the cell performance (i–V curves) and electrochemical active surface area (EAS), and a slow increase in the charge-transfer resistance (Rct), which can be attributed to corrosion of the carbon support and dissolution/migration/agglomeration of the platinum catalyst.
► The PEMFC of a FCV is exposed to the reverse current during startup/shutdown cycles. ► A decrease in anode Pt loading from 0.4 to 0.1 mg decreases the reverse current. ► It leads to a diminished cathode degradation rate during startup/shutdown cycles. |
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AbstractList | A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by the oxygen reduction reaction (ORR) induced at the anode with a hydrogen/air boundary during startup/shutdown processes. With an increase in the reverse current, the degradation rate of the cathode that experiences a highly corrosive condition (locally high potential) increases. In this work, the anode Pt loading is decreased from 0.4 to 0.1 mg cm−2 to decrease the reverse current. The decrease in the anode Pt loading is found to decrease the hydrogen oxidation rates (HOR) during normal operation, but this loading decrease barely affected the cell performance. However, a decrease in the anode Pt loading can significantly decrease the reverse current, leading to a diminished cathode degradation rate during startup/shutdown cycling. It is revealed by slow decreases in the cell performance (i–V curves) and electrochemical active surface area (EAS), and a slow increase in the charge-transfer resistance (Rct), which can be attributed to corrosion of the carbon support and dissolution/migration/agglomeration of the platinum catalyst.
► The PEMFC of a FCV is exposed to the reverse current during startup/shutdown cycles. ► A decrease in anode Pt loading from 0.4 to 0.1 mg decreases the reverse current. ► It leads to a diminished cathode degradation rate during startup/shutdown cycles. |
Author | Hong, Bo Ki Eom, KwangSup Jang, Jong Hyun Kim, Hyoung-Juhn Kim, Soo-Kil Yoo, Sung Jong Cho, EunAe Kim, GyeongHee |
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Keywords | Reverse current condition Durability Polymer electrolyte membrane fuel cell Membrane–electrode assembly Anode platinum loading Startup and shutdown cycling Anode Voltage current curve Polymer electrolytes Cathode Hydrogen Fuel cell vehicles Dissolution Discharge charge cycle Degradation Corrosion Platinum Membrane Membrane-electrode assembly Oxidation Surface area Performance Charge transfer Catalyst Fuel cell |
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Snippet | A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by... |
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SubjectTerms | Alternative fuels. Production and utilization Anode platinum loading Applied sciences Durability Energy Exact sciences and technology Fuels Hydrogen Membrane–electrode assembly Polymer electrolyte membrane fuel cell Reverse current condition Startup and shutdown cycling |
Title | Effects of Pt loading in the anode on the durability of a membrane–electrode assembly for polymer electrolyte membrane fuel cells during startup/shutdown cycling |
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