The impact of air humidity on the operation of proton exchange membrane fuel cells determined using dynamic electrochemical impedance spectroscopy

Janicka, Ewa; Mielniczek, Michal; Gawel, L.; Darowicki, Kazimierz; Landowska, Paulina

doi:10.1016/j.electacta.2020.136036

Cited by 17 publications

(2 citation statements)

References 55 publications

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“…Despite these drawbacks, many researchers still use this technique to evaluate the behavior of electrochemical systems. Janicka et al [1] used EIS to study the variations in the fuel cell impedance in a wide range of current loads and humidity changes. These changes in the impedance determined the variant processes occurring in the fuel cell.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Noise and Solution Order in Calculating the Electrochemical Systems' Impedance Using Impedance Spectroscopy in the Time Domain

2023

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Fast Fourier Transform (FFT) is a standard method for calculating the numerical Fourier transform as well as the impedance of electrochemical systems. However, the presence of noise in data increases the error rate while calculating the numerical Fourier transform and in order to reduce the error rate in noisy conditions, the solution order of the Fourier transform should be enhanced. In the present study, the solution order used for calculating the numerical Fourier transform in the presence of noise was enhanced using a straight line and then second-and third-order polynomials. Next, the impedance of the series, parallel, and battery circuits was calculated. Additionally, the calculated impedance of the higher-order solutions was compared to the acquired impedance through the FFT method in noisy conditions. The ndings of this study demonstrated that increasing the solution order of the numerical Fourier transform from zero up to one would yield satisfactory results; however, further enhancement would deteriorate the outcome responses. Therefore, it can be concluded that the linear method is the best way for calculating the numerical Fourier transform in the presence of noise.

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Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Noise and Solution Order in Calculating the Electrochemical Systems' Impedance Using Impedance Spectroscopy in the Time Domain

2023

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“…When the current density was beyond the optimal hydration current density, the ohmic resistance raised at a sharper rate for higher inlet RH (100%). In order to determine the optimal working conditions of the PEMFC within the combined scope of current and humidity, Janicka et al [10] adopted dynamic electrochemical impedance spectroscopy to study the relationship between the above operating parameters and the impedance values. The optimal performance was achieved when RH was above 35% at low current.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Inlet Gas Relative Humidity on Performance Characteristics of PEMFC Operating at Elevated Temperature

Chang

Zhang

et al. 2021

WEVJ

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Raising the operating temperature is considered to be an effective method to improve the output performance of proton exchange membrane fuel cells (PEMFCs). In this paper, the effects of inlet relative humidity in the anode (RHa) and cathode (RHc) on the polarization curve and impedance spectra of a single rotating serpentine PEMFC were investigated by experimental method at the operating temperature of 90 °C. It was found that the output performance is the smallest in the high RH case (RHa90%/RHc90%) due to the largest mass transfer resistance. However, the ohmic resistance in the dry case (RHa50%/RHc50%) is the highest, and it shows better output performance at more than 1.0 A/cm2 because of the lowest mass transfer resistance. The impact of the changes in the RHa value on the polarization curve is more apparent than that of the RHc changes at high current density. The largest power density can be attained and the efficiency can reach 24.4% when the RHa is 90% and RHc is 50%.

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The impedance of hydrogen oxidation reaction in a proton exchange membrane fuel cell in the presence of carbon monoxide in hydrogen stream

et al. 2020

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The impact of air humidity on the operation of proton exchange membrane fuel cells determined using dynamic electrochemical impedance spectroscopy

Cited by 17 publications

References 55 publications

Investigating the Effect of Noise and Solution Order in Calculating the Electrochemical Systems' Impedance Using Impedance Spectroscopy in the Time Domain

Investigating the Effect of Noise and Solution Order in Calculating the Electrochemical Systems' Impedance Using Impedance Spectroscopy in the Time Domain

Investigation of Inlet Gas Relative Humidity on Performance Characteristics of PEMFC Operating at Elevated Temperature

The impedance of hydrogen oxidation reaction in a proton exchange membrane fuel cell in the presence of carbon monoxide in hydrogen stream

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