Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 53-64 |
| Seitenumfang | 12 |
| Fachzeitschrift | Electrochimica acta |
| Jahrgang | 243 |
| Frühes Online-Datum | 3 Mai 2017 |
| Publikationsstatus | Veröffentlicht - 20 Juli 2017 |
Abstract
In this work, the concentration-alternating frequency response analysis (cFRA) is proposed as a new method to study the dynamics of open electrochemical systems. The cFRA implies the perturbation of the electrochemical system through a feed characterized by a periodic concentration of a certain reactant. The most suitable detectable electrical output variable (potantial or current density) depends on the operating condition under which the experiment is performed. As illustrative example, a transient model accounting for the essential dynamic processes occurring in polymer electrolyte membrane fuel cells (PEMFC) is derived, and used to investigate the valuable insights obtainable from the cFRA spectra. Additionally, a sensitivity analysis is accomplished by use of sensitivity coefficients in order to estimate which model parameters can be better identified from EIS or from cFRA. It is shown that cFRA displayes a significantly higher sensitivity than EIS for kinetic parameters. Moreover, a detailed analysis of the feasibility of the new technique is performed to identify appropriate operating conditions. In conclusion, cFRA can be regarded as an innovative and valuable tool for PEMFC identification.
ASJC Scopus Sachgebiete
- Chemische Verfahrenstechnik (insg.)
- Allgemeine chemische Verfahrenstechnik
- Chemie (insg.)
- Elektrochemie
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in: Electrochimica acta, Jahrgang 243, 20.07.2017, S. 53-64.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Concentration-alternating frequency response
T2 - A new method for studying polymer electrolyte membrane fuel cell dynamics
AU - Sorrentino, Antonio
AU - Vidakovic-Koch, Tanja
AU - Hanke-Rauschenbach, Richard
AU - Sundmacher, Kai
N1 - Publisher Copyright: © 2017 Elsevier Ltd Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/7/20
Y1 - 2017/7/20
N2 - In this work, the concentration-alternating frequency response analysis (cFRA) is proposed as a new method to study the dynamics of open electrochemical systems. The cFRA implies the perturbation of the electrochemical system through a feed characterized by a periodic concentration of a certain reactant. The most suitable detectable electrical output variable (potantial or current density) depends on the operating condition under which the experiment is performed. As illustrative example, a transient model accounting for the essential dynamic processes occurring in polymer electrolyte membrane fuel cells (PEMFC) is derived, and used to investigate the valuable insights obtainable from the cFRA spectra. Additionally, a sensitivity analysis is accomplished by use of sensitivity coefficients in order to estimate which model parameters can be better identified from EIS or from cFRA. It is shown that cFRA displayes a significantly higher sensitivity than EIS for kinetic parameters. Moreover, a detailed analysis of the feasibility of the new technique is performed to identify appropriate operating conditions. In conclusion, cFRA can be regarded as an innovative and valuable tool for PEMFC identification.
AB - In this work, the concentration-alternating frequency response analysis (cFRA) is proposed as a new method to study the dynamics of open electrochemical systems. The cFRA implies the perturbation of the electrochemical system through a feed characterized by a periodic concentration of a certain reactant. The most suitable detectable electrical output variable (potantial or current density) depends on the operating condition under which the experiment is performed. As illustrative example, a transient model accounting for the essential dynamic processes occurring in polymer electrolyte membrane fuel cells (PEMFC) is derived, and used to investigate the valuable insights obtainable from the cFRA spectra. Additionally, a sensitivity analysis is accomplished by use of sensitivity coefficients in order to estimate which model parameters can be better identified from EIS or from cFRA. It is shown that cFRA displayes a significantly higher sensitivity than EIS for kinetic parameters. Moreover, a detailed analysis of the feasibility of the new technique is performed to identify appropriate operating conditions. In conclusion, cFRA can be regarded as an innovative and valuable tool for PEMFC identification.
KW - Electrochemical impedance spectroscopy
KW - Frequency response analysis
KW - Model based system identification
KW - PEM fuel cell dynamics
KW - Sensitivity analysis
UR - http://www.scopus.com/inward/record.url?scp=85019438455&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2017.04.150
DO - 10.1016/j.electacta.2017.04.150
M3 - Article
AN - SCOPUS:85019438455
VL - 243
SP - 53
EP - 64
JO - Electrochimica acta
JF - Electrochimica acta
SN - 0013-4686
ER -