Long-Term Durability of PBI-Based HT-PEM Fuel Cells: Effect of Operating Parameters

Tonny Søndergaard, Lars Nilausen Cleemann*, Hans Becker, Thomas Steenberg, Hans Aage Hjuler, Larisa Seerup, Qingfeng Li, Jens Oluf Jensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

379 Downloads (Pure)

Abstract

This work studies the long-term durability of high-temperature polymer electrolyte membrane fuel cells based on acid-doped polybenzimidazole membranes. The primary focus is on acid loss via the evaporation mechanism, which is a major cause of degradation in applications that involve long-term operation. Durability is assessed for 16 identically fabricated membrane electrode assemblies (MEAs), and evaluations are carried out using operating parameters as stressors with gas stoichiometries ranging from 2 to 25, current densities from 200 to 800 mA cm(-2), and temperatures of 160 or 180 degrees C. Cell diagnostics are composed of time resolved polarization curves, post mortem analysis, and in situ temperature measurements. A major part of the cell degradation during these steady-state tests can be ascribed to increasing area-specific series resistance. By means of post mortem acid-loss measurements, the degradation is correlated to the temperature and to the accumulated gas-flow volume. Such relations are indicative of acid loss via evaporation. Current density also plays a critical role for the acid loss and, thus, for the overall cell degradation. The effect of current is likely tied to mechanisms that involve water generation, migration of electrolyte ions, and locally elevated temperature inside the MEAs. (C) The Author(s) 2018. Published by ECS.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume165
Issue number6
Pages (from-to)F3053-F3062
ISSN0013-4651
DOIs
Publication statusPublished - 2018

Cite this

@article{5b5fd62316d8432bb4df61e2a08c6a90,
title = "Long-Term Durability of PBI-Based HT-PEM Fuel Cells: Effect of Operating Parameters",
abstract = "This work studies the long-term durability of high-temperature polymer electrolyte membrane fuel cells based on acid-doped polybenzimidazole membranes. The primary focus is on acid loss via the evaporation mechanism, which is a major cause of degradation in applications that involve long-term operation. Durability is assessed for 16 identically fabricated membrane electrode assemblies (MEAs), and evaluations are carried out using operating parameters as stressors with gas stoichiometries ranging from 2 to 25, current densities from 200 to 800 mA cm(-2), and temperatures of 160 or 180 degrees C. Cell diagnostics are composed of time resolved polarization curves, post mortem analysis, and in situ temperature measurements. A major part of the cell degradation during these steady-state tests can be ascribed to increasing area-specific series resistance. By means of post mortem acid-loss measurements, the degradation is correlated to the temperature and to the accumulated gas-flow volume. Such relations are indicative of acid loss via evaporation. Current density also plays a critical role for the acid loss and, thus, for the overall cell degradation. The effect of current is likely tied to mechanisms that involve water generation, migration of electrolyte ions, and locally elevated temperature inside the MEAs. (C) The Author(s) 2018. Published by ECS.",
author = "Tonny S{\o}ndergaard and Cleemann, {Lars Nilausen} and Hans Becker and Thomas Steenberg and Hjuler, {Hans Aage} and Larisa Seerup and Qingfeng Li and Jensen, {Jens Oluf}",
year = "2018",
doi = "10.1149/2.0081806jes",
language = "English",
volume = "165",
pages = "F3053--F3062",
journal = "Journal of The Electrochemical Society",
issn = "0013-4651",
publisher = "The Electrochemical Society",
number = "6",

}

Long-Term Durability of PBI-Based HT-PEM Fuel Cells: Effect of Operating Parameters. / Søndergaard, Tonny; Cleemann, Lars Nilausen; Becker, Hans; Steenberg, Thomas; Hjuler, Hans Aage; Seerup, Larisa; Li, Qingfeng; Jensen, Jens Oluf.

In: Journal of the Electrochemical Society, Vol. 165, No. 6, 2018, p. F3053-F3062.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Long-Term Durability of PBI-Based HT-PEM Fuel Cells: Effect of Operating Parameters

AU - Søndergaard, Tonny

AU - Cleemann, Lars Nilausen

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 - This work studies the long-term durability of high-temperature polymer electrolyte membrane fuel cells based on acid-doped polybenzimidazole membranes. The primary focus is on acid loss via the evaporation mechanism, which is a major cause of degradation in applications that involve long-term operation. Durability is assessed for 16 identically fabricated membrane electrode assemblies (MEAs), and evaluations are carried out using operating parameters as stressors with gas stoichiometries ranging from 2 to 25, current densities from 200 to 800 mA cm(-2), and temperatures of 160 or 180 degrees C. Cell diagnostics are composed of time resolved polarization curves, post mortem analysis, and in situ temperature measurements. A major part of the cell degradation during these steady-state tests can be ascribed to increasing area-specific series resistance. By means of post mortem acid-loss measurements, the degradation is correlated to the temperature and to the accumulated gas-flow volume. Such relations are indicative of acid loss via evaporation. Current density also plays a critical role for the acid loss and, thus, for the overall cell degradation. The effect of current is likely tied to mechanisms that involve water generation, migration of electrolyte ions, and locally elevated temperature inside the MEAs. (C) The Author(s) 2018. Published by ECS.

AB - This work studies the long-term durability of high-temperature polymer electrolyte membrane fuel cells based on acid-doped polybenzimidazole membranes. The primary focus is on acid loss via the evaporation mechanism, which is a major cause of degradation in applications that involve long-term operation. Durability is assessed for 16 identically fabricated membrane electrode assemblies (MEAs), and evaluations are carried out using operating parameters as stressors with gas stoichiometries ranging from 2 to 25, current densities from 200 to 800 mA cm(-2), and temperatures of 160 or 180 degrees C. Cell diagnostics are composed of time resolved polarization curves, post mortem analysis, and in situ temperature measurements. A major part of the cell degradation during these steady-state tests can be ascribed to increasing area-specific series resistance. By means of post mortem acid-loss measurements, the degradation is correlated to the temperature and to the accumulated gas-flow volume. Such relations are indicative of acid loss via evaporation. Current density also plays a critical role for the acid loss and, thus, for the overall cell degradation. The effect of current is likely tied to mechanisms that involve water generation, migration of electrolyte ions, and locally elevated temperature inside the MEAs. (C) The Author(s) 2018. Published by ECS.

U2 - 10.1149/2.0081806jes

DO - 10.1149/2.0081806jes

M3 - Journal article

VL - 165

SP - F3053-F3062

JO - Journal of The Electrochemical Society

JF - Journal of The Electrochemical Society

SN - 0013-4651

IS - 6

ER -