In-plane structuring of proton exchange membrane fuel cell cathodes: Effect of ionomer equivalent weight structuring on performance and current density distribution

Herden, Susanne; Riewald, Felix; Hirschfeld, Julian A.; Perchthaler, Markus

doi:10.1016/j.jpowsour.2017.04.051

Cited by 26 publications

(16 citation statements)

References 25 publications

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“…They suggested that understanding these dependencies can ultimately help in the reduction of the Pt loading. Herden et al [11], [12] investigated the effect of varying the ionomer equivalent weight in the in-plane direction on the performance of an automotive cell. The measurements were carried out on a segmented automotive cell, where the current density and temperature distributions were recorded.…”

Section: Introductionmentioning

confidence: 99%

Full Parametric Study of the Influence of Ionomer Content, Catalyst Loading and Catalyst Type on Oxygen and Ion Transport in PEM Fuel Cell Catalyst Layers

et al. 2020

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To advance the technology of polymer electrolyte membrane fuel cells, material development is at the forefront of research. This is especially true for membrane electrode assembly, where the structuring of its various layers has proven to be directly linked to performance increase. In this study, we investigate the influence of the various ingredients in the cathode catalyst layer, such as ionomer content, catalyst loading and catalyst type, on the oxygen and ion transport using a full parametric analysis. Using two types of catalysts, 40 wt.% Pt/C and 60 wt.% Pt/C with high surface area carbon, the ionomer/carbon content was varied between 0.29–1.67, while varying the Pt loading in the range of 0.05–0.8 mg cm−2. The optimum ionomer content was found to be dependent on the operating point and condition, as well as catalyst loading and type. The data set provided in this work gives a starting point to further understanding of structured catalyst layers.

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Section: Introductionmentioning

confidence: 99%

Full Parametric Study of the Influence of Ionomer Content, Catalyst Loading and Catalyst Type on Oxygen and Ion Transport in PEM Fuel Cell Catalyst Layers

et al. 2020

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“…As first of its kind, Cleghorn et al 1 combined the measurement of the current density distribution (CDD) with a local determination of the high frequency resistance to observe the effect of different flow and humidification rates on the local performance of a quadratic 100 cm 2 cell. Furthermore, spatially resolved current density mapping was used in PEMFCs to observe the effects of inhomogeneous catalyst distribution on the cell performance, 2 to evaluate catalyst gradients along the in-plane direction in order to compensate non-homogeneous CDDs due to temperature, hydration or mass flow effects 3,4 or to observe nonlinear pattern formation. 5,6 However, the investigation of the in-plane CDD in proton exchange membrane water electrolysis (PEMWE) cells is a rather new topic.…”

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confidence: 99%

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Immerz

Bensmann

Trinke

et al. 2018

J. Electrochem. Soc.

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The present analysis shows the local distribution of current density and EIS measurements along a 50 cm single-channel proton exchange membrane water electrolysis (PEMWE) cell. Measurements for operating modes with one sufficiently high and one insufficiently low stoichiometric water ratio (λ) were carried out to observe effects on the current density distribution. Furthermore, global and local EIS measurements were performed to distinguish between the cell voltage loss differences in the two cases. The mass transport losses η mtx and the Ohmic voltage losses η show a strong increase, when the stoichiometric water ratio falls below a level of λ ≈ 5. The reduction of the inlet water flux of the anode reduces both the proton conductivity of the ionomer within the catalyst layer and the membrane, increasing transport and Ohmic resistances, respectively. The local analysis has shown that the level of membrane and catalyst hydration under low stoichiometric conditions can be distributed highly non-homogeneous in along-the-channel direction, with the most pronounced dehydration toward the end of the channel.

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“…The setup of MEA #3 (see Table 1) was additionally equipped with a current density distribution measurement unit, provided by S++ Simulation Services. This device allowed measuring the electrical current with a spatial resolution of 0.54 cm 2 (in total 576 segments) and was located near the cathode electrode [28] . The developed analysis approach was intended to be independent on the PEMFC type and setup.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Capacitive Behavior of Polymer Electrolyte Membrane Fuel Cells during Operation

et al. 2020

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The interest in polymer electrolyte membrane fuel cells for automotive applications is nowadays increasing. To run such systems efficiently, the operating strategy relies on information about the stacks operational conditions. The cell capacitance, in most cases, contains such information and it can be measured in real‐time using electrochemical impedance spectroscopy. However, the influence of the operating conditions on the cell capacitance is poorly understood so far. Therefore, this work analyses the influence of the oxygen content and cell voltage. Cyclic voltammetry and impedance spectroscopy data show equal hydrogen adsorption charges in oxygen‐free operation. In oxygen‐saturated atmosphere, the adsorption capacitance below 0.40 V is suppressed, probably owing to the fast adsorption of OH*. However, this allows distinction between the oxygen‐free and oxygen‐saturated conditions, as in the first case the total capacitance is significantly larger. Thus, an impedance‐based operation strategy could detect oxygen undersupply in the fuel cells in real‐time.

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In-plane structuring of proton exchange membrane fuel cell cathodes: Effect of ionomer equivalent weight structuring on performance and current density distribution

Cited by 26 publications

References 25 publications

Full Parametric Study of the Influence of Ionomer Content, Catalyst Loading and Catalyst Type on Oxygen and Ion Transport in PEM Fuel Cell Catalyst Layers

Full Parametric Study of the Influence of Ionomer Content, Catalyst Loading and Catalyst Type on Oxygen and Ion Transport in PEM Fuel Cell Catalyst Layers

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Analysis of the Capacitive Behavior of Polymer Electrolyte Membrane Fuel Cells during Operation

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