Performance test and degradation analysis of direct methanol fuel cell membrane electrode assembly during freeze/thaw cycles

▶ The performance test of DMFC MEAs during freeze/thaw cycling was investigated. ▶ Degradation mechanisms of the post-mortem MEAs were discovered. ▶ Microstructural damage was the major disadvantage to drop the cell performance. ▶ A strategy was designed to prevent the membrane from broken. ▶ The me...

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Veröffentlicht in:Journal of power sources 2011-03, Vol.196 (5), p.2650-2660
Hauptverfasser: Cha, Hou-Chin, Chen, Charn-Ying, Wang, Rui-Xiang, Chang, Chun-Lung
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container_end_page 2660
container_issue 5
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container_title Journal of power sources
container_volume 196
creator Cha, Hou-Chin
Chen, Charn-Ying
Wang, Rui-Xiang
Chang, Chun-Lung
description ▶ The performance test of DMFC MEAs during freeze/thaw cycling was investigated. ▶ Degradation mechanisms of the post-mortem MEAs were discovered. ▶ Microstructural damage was the major disadvantage to drop the cell performance. ▶ A strategy was designed to prevent the membrane from broken. ▶ The methanol solution inside the DMFC stack was forbidden to be frozen. Performance and degradation of direct methanol fuel cell (DMFC) membrane electrode assembly (MEA) are analyzed after repeated freeze/thaw cycles. Three different MEAs stored at −20°C for 8h with the anode side full of methanol solution are selected to test the effects of low temperatures on performance. After the cell heated to 60°C within 30min, they are inspected to determine the degradation mechanism. The resistance R obtained by the polarization curve is essential for identifying the main component affecting cell performance. The electrochemical impedance spectroscopy (EIS) technique is used to characterize the DMFC after freeze/thaw cycles. Thus, deterioration is assessed by measuring the high-frequency resistance (HFR) and the charge-transfer resistance (CTR). The electrochemical surface area (ECA) is employed to investigate not only the actual chemical degradation but also membrane status since sudden loss of ECA on the cathode side can result from a broken membrane. Moreover, a strategy is designed to simulate actual conditions that may prevent the membrane from being broken. A DMFC stack without any heating or heat-insulation devices shall avoid to be stored at subzero temperatures since the membrane will be useless due to frozen of methanol solution.
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Performance and degradation of direct methanol fuel cell (DMFC) membrane electrode assembly (MEA) are analyzed after repeated freeze/thaw cycles. Three different MEAs stored at −20°C for 8h with the anode side full of methanol solution are selected to test the effects of low temperatures on performance. After the cell heated to 60°C within 30min, they are inspected to determine the degradation mechanism. The resistance R obtained by the polarization curve is essential for identifying the main component affecting cell performance. The electrochemical impedance spectroscopy (EIS) technique is used to characterize the DMFC after freeze/thaw cycles. Thus, deterioration is assessed by measuring the high-frequency resistance (HFR) and the charge-transfer resistance (CTR). The electrochemical surface area (ECA) is employed to investigate not only the actual chemical degradation but also membrane status since sudden loss of ECA on the cathode side can result from a broken membrane. 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Performance and degradation of direct methanol fuel cell (DMFC) membrane electrode assembly (MEA) are analyzed after repeated freeze/thaw cycles. Three different MEAs stored at −20°C for 8h with the anode side full of methanol solution are selected to test the effects of low temperatures on performance. After the cell heated to 60°C within 30min, they are inspected to determine the degradation mechanism. The resistance R obtained by the polarization curve is essential for identifying the main component affecting cell performance. The electrochemical impedance spectroscopy (EIS) technique is used to characterize the DMFC after freeze/thaw cycles. Thus, deterioration is assessed by measuring the high-frequency resistance (HFR) and the charge-transfer resistance (CTR). The electrochemical surface area (ECA) is employed to investigate not only the actual chemical degradation but also membrane status since sudden loss of ECA on the cathode side can result from a broken membrane. 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subjects Applied sciences
Assembly
Degradation
Devices
Direct energy conversion and energy accumulation
Direct methanol fuel cell
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical impedance spectroscopy
Electrodes
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Membrane electrode assembly
Membranes
Methyl alcohol
Polarization curve
Subzero temperature
title Performance test and degradation analysis of direct methanol fuel cell membrane electrode assembly during freeze/thaw cycles
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