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Aalborg Universitet Model Estimation of HTPEM Mea Parametersfrom EIS and IV Curves Vang, Jakob Rabjerg; Zhou, Fan

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Aalborg Universitet

Model Estimation of HTPEM Mea Parametersfrom EIS and IV Curves

Vang, Jakob Rabjerg; Zhou, Fan

Publication date:

2015

Document Version

Accepted author manuscript, peer reviewed version Link to publication from Aalborg University

Citation for published version (APA):

Vang, J. R., & Zhou, F. (2015). Model Estimation of HTPEM Mea Parametersfrom EIS and IV Curves. Abstract from Electrochemical science and technology conference 2015, København, Denmark.

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MODEL ESTIMATION OF

Jakob Rabjerg VANG

1Aalborg University

Impedance spectra can be a valuable supplement characterising a fuel cell

presents a finite-volume based

for estimating MEA parameters from impedance spectra and polarisation curves by simultaneous fitting. One of the challenges in the model development concerns the modelling of the catalyst layer.

different assumptions on the fit and the One of the most important ch

different CL models have been implemented. One assumes that the

sits on the surface of the carbon substrate and is covered by a thin film of phosphoric acid (PA). The other approach assumes that t

collected in agglomerates flooded with Note that the agreement with the data is parameter values estimated

literature and are mostly similar regardless of the CL model.

content, the CL thickness

between CL models. The discrepancies relate to differences in reactant transport characteristics of the CL models

values. This is assumed to result from PA migration during operation.

The model is suitable for the analysis

MODEL ESTIMATION OF HTPEM MEA PARAMETERS FROM EIS AND IV CURVES

Jakob Rabjerg VANG1, Fan ZHOU1 Aalborg University, Denmark, jrv@et.aau.dk

Impedance spectra can be a valuable supplement to polarisation curves when fuel cell membrane-electrode-assembly (MEA).

volume based high temperature PEM (HTPEM)

parameters from impedance spectra and polarisation curves One of the challenges in the model development concerns the modelling of the catalyst layer. This work explores the impact of some of the different assumptions on the fit and the estimated MEA parameters.

One of the most important choices is that of catalyst layer have been implemented. One assumes that the

sits on the surface of the carbon substrate and is covered by a thin film of The other approach assumes that the catalyst particles d in agglomerates flooded with PA. The fits are compared in the figures.

Note that the agreement with the data is similar for the two catalyst models. The estimated generally agree well with available data literature and are mostly similar regardless of the CL model.

content, the CL thickness, and the surface area of the CL pores

The discrepancies relate to differences in reactant transport istics of the CL models. The PA content also deviates from literature values. This is assumed to result from PA migration during operation.

The model is suitable for the analysis of data from degradation

MEA PARAMETERS FROM EIS

jrv@et.aau.dk

to polarisation curves when assembly (MEA). This work high temperature PEM (HTPEM) fuel cell model parameters from impedance spectra and polarisation curves One of the challenges in the model development concerns This work explores the impact of some of the

ed MEA parameters.

oices is that of catalyst layer (CL) model. Two have been implemented. One assumes that the Pt catalyst sits on the surface of the carbon substrate and is covered by a thin film of he catalyst particles are The fits are compared in the figures.

for the two catalyst models. The agree well with available data from literature and are mostly similar regardless of the CL model. Only the CL PA and the surface area of the CL pores vary significantly The discrepancies relate to differences in reactant transport . The PA content also deviates from literature values. This is assumed to result from PA migration during operation.

degradation tests.

Referencer

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