Details
| Original language | English |
|---|---|
| Pages (from-to) | 1184-1191 |
| Number of pages | 8 |
| Journal | Electrochimica acta |
| Volume | 2009 |
| Issue number | 54 |
| Publication status | Published - 30 Jan 2009 |
| Externally published | Yes |
Abstract
The polarization performance of two PEM fuel cells (with anode PtRu/C catalyst) connected either in parallel or serial, was compared to the performance of a single PEM fuel cell in galvanostatic operation using CO-free H2 or 200 ppm CO-containing H2 stream as anode feed at ambient temperature. Spontaneous potential oscillations were observed experimentally for the coupled configuration with two cells connected in serial or parallel using CO-containing H2 feed at various current densities applied. The potential oscillations are ascribed by the dynamic CO adsorption and subsequent electrochemical CO oxidation on the anode. The measured anode outlet CO concentration was found to decrease with the order: single cell > parallel cells > serial cells at various current densities and anodic flow rates. The low anode outlet CO concentration (<10 ppm) at high current densities applied showed that CO in the anode feed was removed efficiently by the electrochemical CO oxidation occurring on the PtRu anode. The anode outlet CO concentration decreased as follows: a single cell > the parallel cells > the serial cells at broad range of current densities and anodic flow rates. The highest CO conversion and the highest average power output at equal hydrogen recovery degree were obtained with serially coupled fuel cells.
Keywords
- Electrochemical CO removal, Membrane reactor, PEMFCs, Potential oscillations, Serial/Parallel
ASJC Scopus subject areas
- Chemical Engineering(all)
- General Chemical Engineering
- Chemistry(all)
- Electrochemistry
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In: Electrochimica acta, Vol. 2009, No. 54, 30.01.2009, p. 1184-1191.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Improved electrochemical CO removal via potential oscillations in serially connected PEM fuel cells with PtRu anodes
AU - Lu, Hui
AU - Rihko-Struckmann, Liisa
AU - Hanke-Rauschenbach, Richard
AU - Sundmacher, Kai
N1 - Funding information: Dr. Hui Lu is grateful for the support of a Max Planck Scholarship funded by the Max Planck Gesellschaft. The financial support for this work obtained from the co-operation project ( ProBio ) between the Fraunhofer Gesellschaft and the Max Planck Gesellschaft is gratefully acknowledged.
PY - 2009/1/30
Y1 - 2009/1/30
N2 - The polarization performance of two PEM fuel cells (with anode PtRu/C catalyst) connected either in parallel or serial, was compared to the performance of a single PEM fuel cell in galvanostatic operation using CO-free H2 or 200 ppm CO-containing H2 stream as anode feed at ambient temperature. Spontaneous potential oscillations were observed experimentally for the coupled configuration with two cells connected in serial or parallel using CO-containing H2 feed at various current densities applied. The potential oscillations are ascribed by the dynamic CO adsorption and subsequent electrochemical CO oxidation on the anode. The measured anode outlet CO concentration was found to decrease with the order: single cell > parallel cells > serial cells at various current densities and anodic flow rates. The low anode outlet CO concentration (<10 ppm) at high current densities applied showed that CO in the anode feed was removed efficiently by the electrochemical CO oxidation occurring on the PtRu anode. The anode outlet CO concentration decreased as follows: a single cell > the parallel cells > the serial cells at broad range of current densities and anodic flow rates. The highest CO conversion and the highest average power output at equal hydrogen recovery degree were obtained with serially coupled fuel cells.
AB - The polarization performance of two PEM fuel cells (with anode PtRu/C catalyst) connected either in parallel or serial, was compared to the performance of a single PEM fuel cell in galvanostatic operation using CO-free H2 or 200 ppm CO-containing H2 stream as anode feed at ambient temperature. Spontaneous potential oscillations were observed experimentally for the coupled configuration with two cells connected in serial or parallel using CO-containing H2 feed at various current densities applied. The potential oscillations are ascribed by the dynamic CO adsorption and subsequent electrochemical CO oxidation on the anode. The measured anode outlet CO concentration was found to decrease with the order: single cell > parallel cells > serial cells at various current densities and anodic flow rates. The low anode outlet CO concentration (<10 ppm) at high current densities applied showed that CO in the anode feed was removed efficiently by the electrochemical CO oxidation occurring on the PtRu anode. The anode outlet CO concentration decreased as follows: a single cell > the parallel cells > the serial cells at broad range of current densities and anodic flow rates. The highest CO conversion and the highest average power output at equal hydrogen recovery degree were obtained with serially coupled fuel cells.
KW - Electrochemical CO removal
KW - Membrane reactor
KW - PEMFCs
KW - Potential oscillations
KW - Serial/Parallel
KW - Electrochemical CO removal
KW - Membrane reactor
KW - PEMFCs
KW - Potential oscillations
KW - Serial/Parallel
KW - Bubbles (in fluids)
KW - Bioreactors
KW - Electrochemistry
KW - Fischer-Tropsch synthesis
KW - Platinum alloys
KW - Proton exchange membrane fuel cells (PEMFC)
KW - Solid oxide fuel cells (SOFC)
UR - http://www.scopus.com/inward/record.url?scp=57749094825&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2008.08.053
DO - 10.1016/j.electacta.2008.08.053
M3 - Article
AN - SCOPUS:57749094825
VL - 2009
SP - 1184
EP - 1191
JO - Electrochimica acta
JF - Electrochimica acta
SN - 0013-4686
IS - 54
ER -