PEM Fuel Cell Impedance at Open Circuit

Kulikovsky, Andrei

doi:10.1149/2.0111605jes

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…From the above analysis, the strongly dependent relationship between the P2 peak and current density are highly consistent with the charge transfer impedance of oxygen reduc-tion reactions (ORRs), and the charge transfer impedance also dominates the polarization loss in the low current density regions [54,55].…”

Section: The Polarization Process Analysis Of a New Stack With Drtsupporting

confidence: 60%

Evaluation the Resistance Growth of Aged Vehicular Proton Exchange Membrane Fuel Cell Stack by Distribution of Relaxation Times

Zhu

Yang

2022

Sustainability

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The aged stack results in resistance growth and power decline. At present, most of the analyses of resistance growth are qualitative or identified by complex mechanism models. For more effective identification, the distribution of relaxation times (DRT) method is applied to the aging analysis of the stack. The individual polarization process of the stack corresponding to each DRT peak is determined by appropriate experimental conditions and the impedance of the individual polarization process is characterized by the peak area. The three DRT peaks from low frequency to high frequency are identified as the mass transport, the charge transfer of oxygen reduction reactions (ORRs), and the proton transport in the cathode catalyst layer (CCL) and anode side. The stack’s voltage recession rate is 15% at the rated current density of 800 mA cm−2 after running for 2000 h in the driving cycle. Mass transport is the main reason accounting for 66.1% of the resistance growth. The charge transfer resistance growth cannot be ignored, accounting for 30.23%. The resistance growth obtained by the DRT can quickly and accurately identify the main reason for stack decline and therefore promises to become an important diagnostic tool in relation to aging.

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Section: The Polarization Process Analysis Of a New Stack With Drtsupporting

confidence: 60%

Evaluation the Resistance Growth of Aged Vehicular Proton Exchange Membrane Fuel Cell Stack by Distribution of Relaxation Times

Zhu

Yang

2022

Sustainability

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“…226 reduces to According to the mass conservation equation, the oxygen flux in the GDL equals the consumption rate in the CCL, then we have 213 closed with the boundary conditions Eqs. 275, 223 and 227 are analytically solved (shown in the SI), and then the expression for GDL impedance can be obtained,[199][200][201] The full Nyquist plot of impedance response given by Eq. 276 is shown in Fig.22a.…”

mentioning

confidence: 99%

Editors’ Choice—Review—Impedance Response of Porous Electrodes: Theoretical Framework, Physical Models and Applications

Huang

Gao

Luo

et al. 2020

J. Electrochem. Soc.

145

113

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Porous electrodes are prevalent in electrochemical devices. Electrochemical impedance spectroscopy (EIS) is widely used as a noninvasive, in situ characterization tool to investigate multi-phase (electronic, ionic, gaseous) transport and coupling interfacial reactions in porous electrodes. Interpretation of EIS data needs model and fitting which largely determine the type and amount of information that could possibly be obtained, and thereby the efficacy of the EIS method. This review focuses on physics-based models, as such models, compared to electrical circuit models, are more fundamental in our understanding of the porous electrodes, hence more reliable and more informative. Readers can have a glimpse of the long history of porous electrode theory and in particular its impedance variants, acquaint themselves with the celebrated de Levie model and a general theoretical framework, retrace the journey of extending the de Levie model in three directions, namely, incorporating new physico-chemical processes, treating new structural effects, and considering high orders. Afterwards, a wealth of impedance models developed for lithium-ion batteries and polymer electrolyte fuel cells are introduced. Prospects on remaining and emerging issues on impedance modelling of porous electrodes are presented. When introducing theoretical models, we adopt a “hands-on” approach by providing substantial mathematical details and even computation codes in some cases. Such an approach not only enables readers to understand the assumptions and applicability of the models, but also acquaint them with mathematical techniques involved in impedance modelling, which are instructive for developing their own models.

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“…These experimental Nyquist spectra simulated by the circuit are indicated with red and blue boxes, respectively, at the top of fig. S10 (47)(48)(49)(50)(51)(52). The circuits consist of one resistance element and two parallel-connected resistance and capacitance elements connected in series.…”

Section: The Selective Conductivity Via Proton Intercalation/ Deinter...mentioning

confidence: 99%

Enhancing durability of automotive fuel cells via selective electrical conductivity induced by tungsten oxide layer coated directly on membrane electrode assembly

You,

Jung,

Park

et al. 2023

Sci. Adv.

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The poor durability, attributed to catalyst corrosion during start-up/shutdown (SU/SD), is a major obstacle to the commercialization of fuel cell electric vehicles (FCEVs). We recently achieved durability enhancement under SU/SD conditions by implementing a metal-insulator transition (MIT) using proton intercalation/deintercalation in WO 3 . However, such oxide-supported catalysts were unsuitable for direct application to the mass production stage of membrane electrode assembly (MEA) process due to their physical and chemical properties. Here, we report a unique approach that achieves the same durability enhancement in SU/SD situations while being directly applicable to the conventional MEA fabrication process. We coated WO 3 on the bipolar plate, gas diffusion layer, and MEA to investigate whether the MIT phenomenon was realized. The WO 3 -coated MEA demonstrated 94% performance retention during SU/SD, the highest level to our knowledge. It can directly contribute to enhancing the durability of commercial FCEVs and be immediately applied to the MEA mass production process.

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PEM Fuel Cell Impedance at Open Circuit

Cited by 12 publications

References 40 publications

Evaluation the Resistance Growth of Aged Vehicular Proton Exchange Membrane Fuel Cell Stack by Distribution of Relaxation Times

Evaluation the Resistance Growth of Aged Vehicular Proton Exchange Membrane Fuel Cell Stack by Distribution of Relaxation Times

Editors’ Choice—Review—Impedance Response of Porous Electrodes: Theoretical Framework, Physical Models and Applications

Enhancing durability of automotive fuel cells via selective electrical conductivity induced by tungsten oxide layer coated directly on membrane electrode assembly

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