Spatially Resolved Voltage, Current and Electrochemical Impedance Spectroscopy Measurements

Gerteisen, Dietmar; Mérida, Walter; Kurz, T.; Lupotto, P.; Schwager, Maximilian; Hebling, Christopher

doi:10.1002/fuce.201000181

Cited by 27 publications

(9 citation statements)

References 25 publications

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“…[7]. The system is capable of measuring total and local properties (impedance, voltage, current) with each segment connected to its own potentiostat and FRA.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Spatially Resolved Impedance Spectroscopy with Local Perturbation

2013

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The characteristics of the measured total impedance spectra of polymer electrolyte membrane fuel cells are often not representative of the performance of the cell. This is due in part mainly to two reasons; total impedance measurements are not representative of local phenomena and perturbation of the cell around the steady‐state polarization can result in oscillations of the gas concentrations downstream the flow channels that can affect the trend of the local spectrum. In this study, we overcome these two challenges by measuring the spectra of a segmented cell using local excitation of the segments. With these capabilities, we experimentally investigate the explanation given in works found in literature in regards to the oxygen oscillation in the channel and its effect on the spectra of locally perturbed segments. We further investigate the characteristics of the low frequency arc, measuring for the first time a loop in the spectrum around the transition frequency between the high and low frequency arcs. The characteristics of the spectra are investigated by varying the flow properties with a focus on the effect of air stoichiometry.

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“…[7]. The system is capable of measuring total and local properties (impedance, voltage, current) with each segment connected to its own potentiostat and FRA.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Spatially Resolved Impedance Spectroscopy with Local Perturbation

2013

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“…Gerteisen et al. presented a novel 50‐channel potentiostat/frequency analyzer system, which is capable of traditional electrochemical characterization and simultaneous impedance measurements . A 7 × 7 segmented fuel cell was used to demonstrate the system's flexibility and capabilities.…”

Section: Locally Resolved Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Spatially resolved diagnostic methods for polymer electrolyte fuel cells: a review

Kalyvas

Kucernak

Brett

et al. 2013

WIREs Energy & Environment

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This review discusses the range of diagnostic techniques reported in the literature for spatially resolved studies of operating fuel cells. In situ diagnostic techniques continue to reveal more about the working of fuel cells and in so doing allow for improved cell hardware design, materials selection, and choice of operating conditions to realize advanced electrochemical performance and longevity. These techniques also allow us to scrutinize the validity of conventional bulk electrical measurements and develop detailed models of fuel cell operation. This article is categorized under: Fuel Cells and Hydrogen > Science and Materials

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“…Scanning electrochemical microscopy-based measurements are, for in-stance, used to characterize fundamental processes in half cells with high resolution, but it lacks functionality for industrial fuel cells [16][17][18] . For a complete membrane electrode assembly (MEA), the local impedance response is usually recorded by either measuring with a segmented fuel cell [19][20][21][22][23] or by adding a printed circuit board (PCB) to the setup [24][25] . Segmented cells are based on segmented flow fields and current collectors, with each segment being electronically isolated from its neighbors.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Electrochemical Impedance Spectroscopy of Automotive PEM Fuel Cells

et al. 2022

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Fuel cell electric vehicles (FCEVs), which use polymer electrolyte membrane fuel cells (PEMFCs), provide a prospect to add to a future of harmful-emission-free mobility. However, an in-depth understanding of degradation mechanisms and contributions to performance losses is needed to commercialize FCEVs further. Most previous PEMFC degradation research has focused on global indicators of the cell condition. Still, failure occurs typically due to inhomogeneities in production or operation, leading to localized regions of high degradation rates. Despite simulations indicating that local degradation effects are significantly more pronounced at larger scales, experimental studies only exist for small-sized laboratory fuel cells so far. Here, we present the results of a comprehensive study of spatial distributions of essential PEMFC parameters using electrochemical impedance spectroscopy across the cell surface of automotive-size fuel cells with an active area of 285 cm 2 . In particular, the results reveal increasing mass transport problems with increasing distance from the air inlet and a tendency of lower proton resistances in the center of the cell. One hundred twenty realistic freeze-start cycles degenerated the cell performance drastically. The outer cell regions, subject to the lowest temperatures, showed the most substantial degradation rates, partly compensated by central cell regions with slightly higher temperatures. These findings bridge the gap between simulation and experiment and provide valuable insights for future fuel cell design and operating strategies.

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Spatially Resolved Voltage, Current and Electrochemical Impedance Spectroscopy Measurements

Cited by 27 publications

References 25 publications

Measurement of Spatially Resolved Impedance Spectroscopy with Local Perturbation

Measurement of Spatially Resolved Impedance Spectroscopy with Local Perturbation

Spatially resolved diagnostic methods for polymer electrolyte fuel cells: a review

Spatially Resolved Electrochemical Impedance Spectroscopy of Automotive PEM Fuel Cells

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