Catalyst Degradation Under Potential Cycling as an Accelerated Stress Test for PBI-Based High-Temperature PEM Fuel Cells - Effect of Humidification

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Catalyst Degradation Under Potential Cycling as an Accelerated Stress Test for PBI-Based High-Temperature PEM Fuel Cells - Effect of Humidification. / Søndergaard, Tonny; Cleemann, Lars Nilausen; Zhong, Lijie; Becker, Hans; Steenberg, Thomas; Hjuler, Hans Aage; Seerup, Larisa; Li, Qingfeng; Jensen, Jens Oluf.

In: Electrocatalysis, Vol. 9, No. 3, 2018, p. 302-313.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{c158e221ff40412c8213630c8a59c222,
title = "Catalyst Degradation Under Potential Cycling as an Accelerated Stress Test for PBI-Based High-Temperature PEM Fuel Cells - Effect of Humidification",
abstract = "In the present work, high-temperature polymer electrolyte membrane fuel cells were subjected to accelerated stress tests of 30,000 potential cycles between 0.6 and 1.0 V at 160 textdegreeC (133 h cycling time). The effect that humidity has on the catalyst durability was studied by testing either with or without humidification of the nitrogen that was used as cathode gas during cycling segments. Pronounced degradation was seen from the polarization curves in both cases, though permanent only in the humidified case. In the unhumidified case, the performance loss was more or less recoverable following 24 h of operation at 200 mA cm−2. A difference in degradation behavior was verified with electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy. The strong effect of humidification is explained by drying of the phosphoric acid that is in the catalyst layer(s) versus maintaining humidification of this region. Catalyst degradation due to platinum dissolution, transport of its ions, and eventual recrystallization is reduced when this portion of the acid dries out. Consequently, catalyst particles are only mildly affected by the potential cycling in the unhumidified case.",
keywords = "Durability, Accelerated stress test, Potential cycling, Polymer electrolyte membrane, Fuel cell, Polybenzimidazole, Platinum dissolution",
author = "Tonny S{\o}ndergaard and Cleemann, {Lars Nilausen} and Lijie Zhong and Hans Becker and Thomas Steenberg and Hjuler, {Hans Aage} and Larisa Seerup and Qingfeng Li and Jensen, {Jens Oluf}",
year = "2018",
doi = "10.1007/s12678-017-0427-1",
language = "English",
volume = "9",
pages = "302--313",
journal = "Electrocatalysis",
issn = "1868-2529",
publisher = "Springer New York",
number = "3",

}

RIS

TY - JOUR

T1 - Catalyst Degradation Under Potential Cycling as an Accelerated Stress Test for PBI-Based High-Temperature PEM Fuel Cells - Effect of Humidification

AU - Søndergaard, Tonny

AU - Cleemann, Lars Nilausen

AU - Zhong, Lijie

AU - Becker, Hans

AU - Steenberg, Thomas

AU - Hjuler, Hans Aage

AU - Seerup, Larisa

AU - Li, Qingfeng

AU - Jensen, Jens Oluf

PY - 2018

Y1 - 2018

N2 - In the present work, high-temperature polymer electrolyte membrane fuel cells were subjected to accelerated stress tests of 30,000 potential cycles between 0.6 and 1.0 V at 160 textdegreeC (133 h cycling time). The effect that humidity has on the catalyst durability was studied by testing either with or without humidification of the nitrogen that was used as cathode gas during cycling segments. Pronounced degradation was seen from the polarization curves in both cases, though permanent only in the humidified case. In the unhumidified case, the performance loss was more or less recoverable following 24 h of operation at 200 mA cm−2. A difference in degradation behavior was verified with electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy. The strong effect of humidification is explained by drying of the phosphoric acid that is in the catalyst layer(s) versus maintaining humidification of this region. Catalyst degradation due to platinum dissolution, transport of its ions, and eventual recrystallization is reduced when this portion of the acid dries out. Consequently, catalyst particles are only mildly affected by the potential cycling in the unhumidified case.

AB - In the present work, high-temperature polymer electrolyte membrane fuel cells were subjected to accelerated stress tests of 30,000 potential cycles between 0.6 and 1.0 V at 160 textdegreeC (133 h cycling time). The effect that humidity has on the catalyst durability was studied by testing either with or without humidification of the nitrogen that was used as cathode gas during cycling segments. Pronounced degradation was seen from the polarization curves in both cases, though permanent only in the humidified case. In the unhumidified case, the performance loss was more or less recoverable following 24 h of operation at 200 mA cm−2. A difference in degradation behavior was verified with electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy. The strong effect of humidification is explained by drying of the phosphoric acid that is in the catalyst layer(s) versus maintaining humidification of this region. Catalyst degradation due to platinum dissolution, transport of its ions, and eventual recrystallization is reduced when this portion of the acid dries out. Consequently, catalyst particles are only mildly affected by the potential cycling in the unhumidified case.

KW - Durability

KW - Accelerated stress test

KW - Potential cycling

KW - Polymer electrolyte membrane

KW - Fuel cell

KW - Polybenzimidazole

KW - Platinum dissolution

U2 - 10.1007/s12678-017-0427-1

DO - 10.1007/s12678-017-0427-1

M3 - Journal article

VL - 9

SP - 302

EP - 313

JO - Electrocatalysis

JF - Electrocatalysis

SN - 1868-2529

IS - 3

ER -