Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition

Kwangsup Eom, Eunae Cho, SukWoo Nam, Tae Hoon Lim, Jong Hyun Jang, Hyoung Juhn Kim, Bo Ki Hong, Yoo Chang Yang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

To examine durability of metallic bipolar plates (BPs) under reverse current conditions, the degradation of PEMFC employing graphite, bare 316L, and CrN-coated 316L BPs is investigated via a 1.4 V pulse cycling test. After 20 cycles, the average voltage decay rate at 160 mA cm -2 is 6.8, 16.8, and 12.0 mV cycle -1 for the single cell using graphite, bare 316L, and CrN-coated 316L BPs, respectively. SEM, EPMA, and TEM analyses of the cathodes that experienced an extraordinary high voltage of 1.4 V show that carbon corrosion and Pt migration/agglomeration occur similarly for the single cells, irrespective of the bipolar plate material. In contrast, in the membrane tested with bare 316L and CrN-coated 316L, Fe and Cr are detected; the amounts of Fe and Cr in the membrane are higher for bare 316L than for CrN-coated 316L. The membrane contamination results in a decrease in the ionic conductivity of the membranes, which mainly contributes to the faster performance decay of the single cells employing bare 316L and CrN-coated 316L bipolar plates. Thus, if automotive PEMFCs using metallic BPs are exposed to reverse current conditions upon start/stop cycles, metal contamination of the membrane could accelerate the performance decay in addition to the cathode degradation, such as carbon corrosion and Pt migration/agglomeration.

Original languageEnglish
Pages (from-to)324-330
Number of pages7
JournalElectrochimica Acta
Volume78
DOIs
Publication statusPublished - 2012 Sep 1
Externally publishedYes

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
Membranes
Degradation
Graphite
Cathodes
Contamination
Carbon
Agglomeration
Corrosion
Electron probe microanalysis
Electric potential
Ionic conductivity
Durability
Metals
Transmission electron microscopy
Scanning electron microscopy

Keywords

  • 1.4 V pulse cycling
  • Bipolar plate
  • Degradation
  • Polymer electrolyte membrane fuel cell
  • Stainless steel bipolar plate

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition. / Eom, Kwangsup; Cho, Eunae; Nam, SukWoo; Lim, Tae Hoon; Jang, Jong Hyun; Kim, Hyoung Juhn; Hong, Bo Ki; Yang, Yoo Chang.

In: Electrochimica Acta, Vol. 78, 01.09.2012, p. 324-330.

Research output: Contribution to journalArticle

Eom, Kwangsup ; Cho, Eunae ; Nam, SukWoo ; Lim, Tae Hoon ; Jang, Jong Hyun ; Kim, Hyoung Juhn ; Hong, Bo Ki ; Yang, Yoo Chang. / Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition. In: Electrochimica Acta. 2012 ; Vol. 78. pp. 324-330.
@article{3e04a98c1b42455081c6d6105f04ca65,
title = "Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition",
abstract = "To examine durability of metallic bipolar plates (BPs) under reverse current conditions, the degradation of PEMFC employing graphite, bare 316L, and CrN-coated 316L BPs is investigated via a 1.4 V pulse cycling test. After 20 cycles, the average voltage decay rate at 160 mA cm -2 is 6.8, 16.8, and 12.0 mV cycle -1 for the single cell using graphite, bare 316L, and CrN-coated 316L BPs, respectively. SEM, EPMA, and TEM analyses of the cathodes that experienced an extraordinary high voltage of 1.4 V show that carbon corrosion and Pt migration/agglomeration occur similarly for the single cells, irrespective of the bipolar plate material. In contrast, in the membrane tested with bare 316L and CrN-coated 316L, Fe and Cr are detected; the amounts of Fe and Cr in the membrane are higher for bare 316L than for CrN-coated 316L. The membrane contamination results in a decrease in the ionic conductivity of the membranes, which mainly contributes to the faster performance decay of the single cells employing bare 316L and CrN-coated 316L bipolar plates. Thus, if automotive PEMFCs using metallic BPs are exposed to reverse current conditions upon start/stop cycles, metal contamination of the membrane could accelerate the performance decay in addition to the cathode degradation, such as carbon corrosion and Pt migration/agglomeration.",
keywords = "1.4 V pulse cycling, Bipolar plate, Degradation, Polymer electrolyte membrane fuel cell, Stainless steel bipolar plate",
author = "Kwangsup Eom and Eunae Cho and SukWoo Nam and Lim, {Tae Hoon} and Jang, {Jong Hyun} and Kim, {Hyoung Juhn} and Hong, {Bo Ki} and Yang, {Yoo Chang}",
year = "2012",
month = "9",
day = "1",
doi = "10.1016/j.electacta.2012.06.024",
language = "English",
volume = "78",
pages = "324--330",
journal = "Electrochimica Acta",
issn = "0013-4686",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition

AU - Eom, Kwangsup

AU - Cho, Eunae

AU - Nam, SukWoo

AU - Lim, Tae Hoon

AU - Jang, Jong Hyun

AU - Kim, Hyoung Juhn

AU - Hong, Bo Ki

AU - Yang, Yoo Chang

PY - 2012/9/1

Y1 - 2012/9/1

N2 - To examine durability of metallic bipolar plates (BPs) under reverse current conditions, the degradation of PEMFC employing graphite, bare 316L, and CrN-coated 316L BPs is investigated via a 1.4 V pulse cycling test. After 20 cycles, the average voltage decay rate at 160 mA cm -2 is 6.8, 16.8, and 12.0 mV cycle -1 for the single cell using graphite, bare 316L, and CrN-coated 316L BPs, respectively. SEM, EPMA, and TEM analyses of the cathodes that experienced an extraordinary high voltage of 1.4 V show that carbon corrosion and Pt migration/agglomeration occur similarly for the single cells, irrespective of the bipolar plate material. In contrast, in the membrane tested with bare 316L and CrN-coated 316L, Fe and Cr are detected; the amounts of Fe and Cr in the membrane are higher for bare 316L than for CrN-coated 316L. The membrane contamination results in a decrease in the ionic conductivity of the membranes, which mainly contributes to the faster performance decay of the single cells employing bare 316L and CrN-coated 316L bipolar plates. Thus, if automotive PEMFCs using metallic BPs are exposed to reverse current conditions upon start/stop cycles, metal contamination of the membrane could accelerate the performance decay in addition to the cathode degradation, such as carbon corrosion and Pt migration/agglomeration.

AB - To examine durability of metallic bipolar plates (BPs) under reverse current conditions, the degradation of PEMFC employing graphite, bare 316L, and CrN-coated 316L BPs is investigated via a 1.4 V pulse cycling test. After 20 cycles, the average voltage decay rate at 160 mA cm -2 is 6.8, 16.8, and 12.0 mV cycle -1 for the single cell using graphite, bare 316L, and CrN-coated 316L BPs, respectively. SEM, EPMA, and TEM analyses of the cathodes that experienced an extraordinary high voltage of 1.4 V show that carbon corrosion and Pt migration/agglomeration occur similarly for the single cells, irrespective of the bipolar plate material. In contrast, in the membrane tested with bare 316L and CrN-coated 316L, Fe and Cr are detected; the amounts of Fe and Cr in the membrane are higher for bare 316L than for CrN-coated 316L. The membrane contamination results in a decrease in the ionic conductivity of the membranes, which mainly contributes to the faster performance decay of the single cells employing bare 316L and CrN-coated 316L bipolar plates. Thus, if automotive PEMFCs using metallic BPs are exposed to reverse current conditions upon start/stop cycles, metal contamination of the membrane could accelerate the performance decay in addition to the cathode degradation, such as carbon corrosion and Pt migration/agglomeration.

KW - 1.4 V pulse cycling

KW - Bipolar plate

KW - Degradation

KW - Polymer electrolyte membrane fuel cell

KW - Stainless steel bipolar plate

UR - http://www.scopus.com/inward/record.url?scp=84864283265&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864283265&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2012.06.024

DO - 10.1016/j.electacta.2012.06.024

M3 - Article

VL - 78

SP - 324

EP - 330

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -