Influence of oxygen on the cathode in HT-PEM fuel cells

S. Søndergaard, L. N. Cleemann, J. O. Jensen, N. J. Bjerrum*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this paper, we have shown that an increase in the pressure of oxygen on the cathode side in HT-PEM fuel cells leads first to an increase and then a decrease in the potential of the cell and again at even higher pressures to an increase. The most likely explanation for this peculiar phenomenon is a competition between oxygen and phosphoric acid on the surface of the platinum catalyst in the three phase boundary. An increase in the oxygen pressure will in this way remove phosphoric acid from the platinum giving more space for oxygen but at higher pressure creating mass transport problems due to lack of phosphoric acid whereas at even higher pressures oxygen can orient itself in a different way on the platinum surface giving more space to the acid.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number36
Pages (from-to)20379-20388
Number of pages10
ISSN0360-3199
DOIs
Publication statusPublished - 2019

Keywords

  • HT-PEM
  • Fuel cell
  • Polybenzimidazole
  • PBI
  • Negative O2 effect on the cathode

Cite this

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title = "Influence of oxygen on the cathode in HT-PEM fuel cells",
abstract = "In this paper, we have shown that an increase in the pressure of oxygen on the cathode side in HT-PEM fuel cells leads first to an increase and then a decrease in the potential of the cell and again at even higher pressures to an increase. The most likely explanation for this peculiar phenomenon is a competition between oxygen and phosphoric acid on the surface of the platinum catalyst in the three phase boundary. An increase in the oxygen pressure will in this way remove phosphoric acid from the platinum giving more space for oxygen but at higher pressure creating mass transport problems due to lack of phosphoric acid whereas at even higher pressures oxygen can orient itself in a different way on the platinum surface giving more space to the acid.",
keywords = "HT-PEM, Fuel cell, Polybenzimidazole, PBI, Negative O2 effect on the cathode",
author = "S. S{\o}ndergaard and Cleemann, {L. N.} and Jensen, {J. O.} and Bjerrum, {N. J.}",
year = "2019",
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Influence of oxygen on the cathode in HT-PEM fuel cells. / Søndergaard, S.; Cleemann, L. N.; Jensen, J. O.; Bjerrum, N. J.

In: International Journal of Hydrogen Energy, Vol. 44, No. 36, 2019, p. 20379-20388.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Influence of oxygen on the cathode in HT-PEM fuel cells

AU - Søndergaard, S.

AU - Cleemann, L. N.

AU - Jensen, J. O.

AU - Bjerrum, N. J.

PY - 2019

Y1 - 2019

N2 - In this paper, we have shown that an increase in the pressure of oxygen on the cathode side in HT-PEM fuel cells leads first to an increase and then a decrease in the potential of the cell and again at even higher pressures to an increase. The most likely explanation for this peculiar phenomenon is a competition between oxygen and phosphoric acid on the surface of the platinum catalyst in the three phase boundary. An increase in the oxygen pressure will in this way remove phosphoric acid from the platinum giving more space for oxygen but at higher pressure creating mass transport problems due to lack of phosphoric acid whereas at even higher pressures oxygen can orient itself in a different way on the platinum surface giving more space to the acid.

AB - In this paper, we have shown that an increase in the pressure of oxygen on the cathode side in HT-PEM fuel cells leads first to an increase and then a decrease in the potential of the cell and again at even higher pressures to an increase. The most likely explanation for this peculiar phenomenon is a competition between oxygen and phosphoric acid on the surface of the platinum catalyst in the three phase boundary. An increase in the oxygen pressure will in this way remove phosphoric acid from the platinum giving more space for oxygen but at higher pressure creating mass transport problems due to lack of phosphoric acid whereas at even higher pressures oxygen can orient itself in a different way on the platinum surface giving more space to the acid.

KW - HT-PEM

KW - Fuel cell

KW - Polybenzimidazole

KW - PBI

KW - Negative O2 effect on the cathode

U2 - 10.1016/j.ijhydene.2019.06.025

DO - 10.1016/j.ijhydene.2019.06.025

M3 - Journal article

VL - 44

SP - 20379

EP - 20388

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 36

ER -