Details
| Original language | English |
|---|---|
| Pages (from-to) | 25315-25329 |
| Number of pages | 15 |
| Journal | Journal of Physical Chemistry C |
| Volume | 115 |
| Issue number | 51 |
| Publication status | Published - 29 Dec 2011 |
| Externally published | Yes |
Abstract
In the present contribution, the operation of a low temperature polymer electrolyte membrane fuel cell (PEMFC) with H 2/CO and N 2/CO mixtures is studied. The aim of the work is to clarify a discrepancy between earlier experiments with conventional electrochemical arrangements and experiments carried out with PEMFCs: Investigations of CO oxidation with rotating disk electrode (RDE) setups in acidic electrolytes revealed a hysteresis in the polarization curve around the onset overpotential of CO oxidation, which was not found in PEMFCs so far. The proof of a hysteresis in the PEMFC polarization curve could be interesting in terms of fuel cell performance, because it was argued that its presence also influences the oxidation of H 2/CO mixtures. Indeed, in the present work, this hysteresis during operation with a N 2/CO mixture is found, but it is seen that it disappears once H 2 is added. To understand the background of these studies, a spatially lumped model is derived.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 115, No. 51, 29.12.2011, p. 25315-25329.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The S-shaped negative differential resistance during the electrooxidation of H 2/CO in polymer electrolyte membrane fuel cells
T2 - Modeling and experimental proof
AU - Kirsch, Sebastian
AU - Hanke-Rauschenbach, Richard
AU - El-Sibai, Ali
AU - Flockerzi, Dietrich
AU - Krischer, Katharina
AU - Sundmacher, Kai
N1 - Copyright: Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2011/12/29
Y1 - 2011/12/29
N2 - In the present contribution, the operation of a low temperature polymer electrolyte membrane fuel cell (PEMFC) with H 2/CO and N 2/CO mixtures is studied. The aim of the work is to clarify a discrepancy between earlier experiments with conventional electrochemical arrangements and experiments carried out with PEMFCs: Investigations of CO oxidation with rotating disk electrode (RDE) setups in acidic electrolytes revealed a hysteresis in the polarization curve around the onset overpotential of CO oxidation, which was not found in PEMFCs so far. The proof of a hysteresis in the PEMFC polarization curve could be interesting in terms of fuel cell performance, because it was argued that its presence also influences the oxidation of H 2/CO mixtures. Indeed, in the present work, this hysteresis during operation with a N 2/CO mixture is found, but it is seen that it disappears once H 2 is added. To understand the background of these studies, a spatially lumped model is derived.
AB - In the present contribution, the operation of a low temperature polymer electrolyte membrane fuel cell (PEMFC) with H 2/CO and N 2/CO mixtures is studied. The aim of the work is to clarify a discrepancy between earlier experiments with conventional electrochemical arrangements and experiments carried out with PEMFCs: Investigations of CO oxidation with rotating disk electrode (RDE) setups in acidic electrolytes revealed a hysteresis in the polarization curve around the onset overpotential of CO oxidation, which was not found in PEMFCs so far. The proof of a hysteresis in the PEMFC polarization curve could be interesting in terms of fuel cell performance, because it was argued that its presence also influences the oxidation of H 2/CO mixtures. Indeed, in the present work, this hysteresis during operation with a N 2/CO mixture is found, but it is seen that it disappears once H 2 is added. To understand the background of these studies, a spatially lumped model is derived.
KW - S-shaped
KW - Acidic electrolytes
KW - CO oxidation
KW - Fuel cell performance
KW - Low temperature polymers
KW - Proton exchange membrane fuel cells
KW - PFMFC
UR - http://www.scopus.com/inward/record.url?scp=84255173411&partnerID=8YFLogxK
U2 - 10.1021/jp206660y
DO - 10.1021/jp206660y
M3 - Article
AN - SCOPUS:84255173411
VL - 115
SP - 25315
EP - 25329
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 51
ER -