Impedance Spectroscopy Study of the PEM Fuel Cell Cathode with Nonuniform Nafion Loading

Reshetenko, Tatyana V.; Kulikovsky, Andrei

doi:10.1149/2.0041711jes

Cited by 29 publications

(28 citation statements)

References 40 publications

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“…Below, we will assume that s(x) is exponential function s = exp(−βx) [ 9 ] where β is the inverse characteristic scale of the exponent. Experimental and modeling study 13,14 have shown that Eq. 9 provides a good fit of the spectra in the high-frequency range.…”

Section: 14mentioning

confidence: 99%

“…A strong nonuniformity of proton conductivity through the CCL depth has been reported by Lefebvre,11 Li and Pickup 12 and by Reshetenko and Kulikovsky. 13,14 A detailed discussion of the effects of Nafion loading is given in a recent review of Huang et al 15 Measurements of an oxygen mass transport resistance in a low-Pt electrode have been performed using the method of limiting current density in a cell fed with diluted oxygen, 1,16,17 and in a hydrogenpumped cell. 7,9 Both methods enable determination of the GDL masstransfer resistance; however, measuring of the CCL oxygen transport properties by the limiting current methods is less reliable.…”

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confidence: 99%

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Impedance Spectroscopy Characterization of Oxygen Transport in Low– and High–Pt Loaded PEM Fuel Cells

Reshetenko

Kulikovsky

2017

J. Electrochem. Soc.

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We report fitting of the physics-based model for the cathode side impedance to the experimental spectra of low-Pt loaded (0.1/0.1 mg Pt cm −2 ) and high-Pt loaded (0.4/0.4 mg Pt cm −2 ) PEM fuel cells measured in the range of current densities from 50 to 400 mA cm −2 . Fitting allowed us to separate the oxygen diffusion coefficients in the catalyst layer D ox and in the gas-diffusion layer D b , and the respective mass transfer coefficients of the electrodes of both types. In the low-Pt electrode, D ox is an order of magnitude lower, than in the high-Pt electrode; however, due to 4-fold difference in the electrode thickness, the respective mass transfer coefficients are close to each other. In both the electrodes, the oxygen diffusion and the mass transfer coefficients in the GDL are nearly the same and they are much higher, than the respective coefficients in the CCLs. The ORR Tafel slope and D ox exhibit linear growth with the cell current density; both effects could be attributed to "cleaning" of Pt surface from oxides at lower cell potential.

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Section: 14mentioning

confidence: 99%

mentioning

confidence: 99%

Impedance Spectroscopy Characterization of Oxygen Transport in Low– and High–Pt Loaded PEM Fuel Cells

Reshetenko

Kulikovsky

2017

J. Electrochem. Soc.

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“…Several different ECs can result in the same spectrum, leading to completely different physical interpretations (Baltianski and Tsur 2003). Thus, other modern analysis techniques, notably Impedance Spectroscopy Genetic Programming (ISGP) (Hershkovitz et al 2011, Hershkovitz et al 2012, Drach et al 2016, Oz et al 2016, Oz et al 2017, analyzing distribution of relaxation times in the system, and mechanistic models (Amphlett et al 1995, Springer et al 1996, Franco et al 2007, Reshetenko and Kulikovsky 2017, are being also employed.…”

Section: Characterization Of Pem Transport Properties 41 In Situ Pemmentioning

confidence: 99%

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Gloukhovski

Freger

Tsur

2017

Reviews in Chemical Engineering

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Abstract Composite membranes based on porous support membranes filled with a proton-conducting polymer appear to be a promising approach to develop novel proton exchange membranes (PEMs). It allows optimization of the properties of the filler and the matrix separately, e.g. for maximal conductivity of the former and maximal physical strength of the latter. In addition, the confinement itself can alter the properties of the filling ionomer, e.g. toward higher conductivity and selectivity due to alignment and restricted swelling. This article reviews the literature on PEMs prepared by filling of submicron and nanometric size pores with Nafion and other proton-conductive polymers. PEMs based on alternating perfluorinated and non-perfluorinated polymer systems and incorporation of fillers are briefly discussed too, as they share some structure/transport relationships with the pore-filling PEMs. We also review here the background knowledge on structural and transport properties of Nafion and proton-conducting polymers in general, as well as experimental methods concerned with preparation and characterization of pore-filling membranes. Such information will be useful for preparing next-generation composite membranes, which will allow maximal utilization of beneficial characteristics of polymeric proton conductors and understanding the complicated structure/transport relationships in the pore-filling composite PEMs.

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“…The local cell current density j 0 and the static oxygen concentration in the channel c 0 h depend on the distance along the channelz: (10) is independent of the applied potential perturbation η Z loc = Z ct+ p + Z ox + Z gdl+c [22] Note that all the three terms in this sum depend on the distance along the channel through this dependence of j 0 , Eq. 21; in addition, Z gdl+c depends onz also through c 1 h , Eq.…”

Section: Z Oxmentioning

confidence: 99%

“…Analytical expressions for the components of the cathode side impedance have been derived in previous works; 20,22,27 however, plain summation of the respective components leads to a very slow fitting code. Here, we derive a "fast" analytical expression for the total impedance of the cathode side and demonstrate this expression "at work" by fitting it to the experimental spectra of a low-and high-temperature PEMFCs.…”

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confidence: 99%

A Fast Low-Current Model for Impedance of a PEM Fuel Cell Cathode at Low Air Stoichiometry

Kulikovsky

2017

J. Electrochem. Soc.

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We report a physics-based analytical model for low-current PEM fuel cell impedance, which takes into account oxygen transport in the channel. The model is fast: fitting the model impedance to the experimental Nyquist spectrum takes about 2 minutes on a 2-GHz notebook. In addition to the transport and kinetic parameters of the catalyst layer, fitting returns the oxygen diffusion coefficient in the gas-diffusion layer and the resistivity due to oxygen transport in the channel. Maple worksheet with the fitting procedure is available for download.

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Impedance Spectroscopy Study of the PEM Fuel Cell Cathode with Nonuniform Nafion Loading

Cited by 29 publications

References 40 publications

Impedance Spectroscopy Characterization of Oxygen Transport in Low– and High–Pt Loaded PEM Fuel Cells

Impedance Spectroscopy Characterization of Oxygen Transport in Low– and High–Pt Loaded PEM Fuel Cells

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

A Fast Low-Current Model for Impedance of a PEM Fuel Cell Cathode at Low Air Stoichiometry

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