Details
| Original language | English |
|---|---|
| Pages (from-to) | 15318-15327 |
| Number of pages | 10 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 38 |
| Issue number | 35 |
| Publication status | Published - 22 Nov 2013 |
| Externally published | Yes |
Abstract
In this study, we experimentally investigate the appearance of a local negative differential resistance (N-NDR) branch in polarization curves of a segmented 7 by 7 cell measured under the steady and highly-dynamic conditions. Under both conditions, a comma shaped polarization curve, corresponding to depletion of oxygen, was followed by an increase in current as the cell voltage was lowered. This characteristic was measured under potentiostatic mode, where no current is forced through the cell, and at a positive cell voltage (<100 mV in steady-state and ∼300 mV in dynamic condition). With a theoretical model, we show that at these positive cell voltages and upon the depletion of oxygen, a shift in the Nernst potential occurs allowing for the hydrogen evolution reaction to take place in the cathode catalyst layer. The results of the model are complemented with experimental measurements of produced hydrogen at the cathode outlet.
Keywords
- Hydrogen evolution reaction, Negative differential resistance, Oxygen depletion, Polarization curve
ASJC Scopus subject areas
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Energy(all)
- Fuel Technology
- Physics and Astronomy(all)
- Condensed Matter Physics
- Energy(all)
- Energy Engineering and Power Technology
Sustainable Development Goals
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In: International Journal of Hydrogen Energy, Vol. 38, No. 35, 22.11.2013, p. 15318-15327.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Relating the N-shaped polarization curve of a PEM fuel cell to local oxygen starvation and hydrogen evolution
AU - Zamel, Nada
AU - Hanke-Rauschenbach, Richard
AU - Kirsch, Sebastian
AU - Bhattarai, Arjun
AU - Gerteisen, Dietmar
N1 - Funding information: The Fraunhofer-Institute for Solar Energy Systems (ISE) and the Max Planck Institute for Dynamics of Complex Technical Systems gratefully acknowledge financial support from German Federal Ministry of Education and Research (BMBF) under the project “GECKO”, Grant No. 03SF0454A and 03SF0454B , respectively. The author N. Zamel would like to gratefully acknowledge the financial support of Natural Sciences and Engineering Research Council of Canada (NSERC) in the form of a Postdoctoral Fellowship.
PY - 2013/11/22
Y1 - 2013/11/22
N2 - In this study, we experimentally investigate the appearance of a local negative differential resistance (N-NDR) branch in polarization curves of a segmented 7 by 7 cell measured under the steady and highly-dynamic conditions. Under both conditions, a comma shaped polarization curve, corresponding to depletion of oxygen, was followed by an increase in current as the cell voltage was lowered. This characteristic was measured under potentiostatic mode, where no current is forced through the cell, and at a positive cell voltage (<100 mV in steady-state and ∼300 mV in dynamic condition). With a theoretical model, we show that at these positive cell voltages and upon the depletion of oxygen, a shift in the Nernst potential occurs allowing for the hydrogen evolution reaction to take place in the cathode catalyst layer. The results of the model are complemented with experimental measurements of produced hydrogen at the cathode outlet.
AB - In this study, we experimentally investigate the appearance of a local negative differential resistance (N-NDR) branch in polarization curves of a segmented 7 by 7 cell measured under the steady and highly-dynamic conditions. Under both conditions, a comma shaped polarization curve, corresponding to depletion of oxygen, was followed by an increase in current as the cell voltage was lowered. This characteristic was measured under potentiostatic mode, where no current is forced through the cell, and at a positive cell voltage (<100 mV in steady-state and ∼300 mV in dynamic condition). With a theoretical model, we show that at these positive cell voltages and upon the depletion of oxygen, a shift in the Nernst potential occurs allowing for the hydrogen evolution reaction to take place in the cathode catalyst layer. The results of the model are complemented with experimental measurements of produced hydrogen at the cathode outlet.
KW - Hydrogen evolution reaction
KW - Negative differential resistance
KW - Oxygen depletion
KW - Polarization curve
KW - Hydrogen evolution reaction
KW - Negative differential resistance
KW - Oxygen depletion
KW - Polarization curve
UR - http://www.scopus.com/inward/record.url?scp=84887108340&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2013.09.130
DO - 10.1016/j.ijhydene.2013.09.130
M3 - Article
AN - SCOPUS:84887108340
VL - 38
SP - 15318
EP - 15327
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 35
ER -