Spatially Resolved, In Situ Potential Measurements through Porous Electrodes As Applied to Fuel Cells

A low platinum loading model, considering both the platinum loading and platinum particle distribution on carbon support, is developed. This model takes into account the interfacial transport resistances at ionomer, water film and Pt particle surfaces in order to capture the effects of Pt loading and electrode composition on fuel cell performance. After coupling this electrode model into a comprehensive PEM fuel cell model, i.e. M2 model, experimental validation is performed for a wide range of Pt loading from 0.2 to 0.025 mg/cm 2 for two electrode compositions with and without carbon dilution. Good agreement between the predicted and measured polarization curves is achieved under wide-ranging operating conditions. The agglomerate size effect is also examined and it is shown that the agglomerates have virtually no effect on cell performance for agglomerate radius smaller than 150 nm. Since in realistic fuel cell catalyst layers, agglomerates may not exist, or may only exist with sizes no larger than 150 nm based on SEM observations, the present work suggests that the standard homogeneous electrode model is suitable and sufficient for analyses of transport losses in PEM fuel cell electrodes where interfacial transport resistances exist.

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“…From Equation 29, the oxygen concentration difference between C g o 2 and C pt o 2 for catalyst type1 and 2 are,…”

Section: Appendix Amentioning

confidence: 99%

Modeling and Experimental Validation of Pt Loading and Electrode Composition Effects in PEM Fuel Cells

Hao

Moriyama

et al. 2015

J. Electrochem. Soc.

139

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“…Previously some researchers have studied the distribution model from the theoretical aspect 8 9 . There are a few reports made to directly observe the reaction distribution of composite electrodes 10 11 12 13 14 15 16 . More recently, in situ observations of reaction distribution have been reported 17 18 19 .…”

mentioning

confidence: 99%

Ionic Conduction in Lithium Ion Battery Composite Electrode Governs Cross-sectional Reaction Distribution

Orikasa

Gogyo

Yamashige

et al. 2016

Sci Rep

141

119

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Composite electrodes containing active materials, carbon and binder are widely used in lithium-ion batteries. Since the electrode reaction occurs preferentially in regions with lower resistance, reaction distribution can be happened within composite electrodes. We investigate the relationship between the reaction distribution with depth direction and electronic/ionic conductivity in composite electrodes with changing electrode porosities. Two dimensional X-ray absorption spectroscopy shows that the reaction distribution is happened in lower porosity electrodes. Our developed 6-probe method can measure electronic/ionic conductivity in composite electrodes. The ionic conductivity is decreased for lower porosity electrodes, which governs the reaction distribution of composite electrodes and their performances.

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“…Then, processing units do not interfere with each other, impedance spectra and their final results are possible to monitor. This new design is expected to provide development guides for monitoring systems of electric vehicle batteries, 15) fuel cell power plants, 16,17) and so on.…”

Section: Resultsmentioning

confidence: 99%

A New Algorithm Design for the Real-time Electrochemical Impedance Monitoring System

Chang¹

2012

J. Electrochem. Sci. Technol

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It is generally known that electrochemical impedance spectroscopy is a powerful technique and its real-time application has been demanded for prompt observations on instantaneous electrochemical changes. Nevertheless, long measurement time and laborious analysis procedures have hindered development of it. Solving the problems, here I report of a new algorithm design for development of a real-time electrochemical impedance monitoring system, which potentially provides a guideline in developing monitoring systems of electric vehicles batteries and other electrochemical power plants. The significant progress in this report is employment of the parallel processing protocol which connects independent sub functions to successfully operate with avoiding mutual interruptions. Therefore, all the processes required to monitor electrochemical impedance changes in realtime are properly operated. To realize the conceptual scheme, a Labview program was coded with sub functions units which conduct their processes individually and only data are transferred between them through the parallel pipelines. Finally, measured impedance spectra and analysis results are displayed, which are synchronized according to the time of change.

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Spatially Resolved, In Situ Potential Measurements through Porous Electrodes As Applied to Fuel Cells

Cited by 47 publications

References 22 publications

Modeling and Experimental Validation of Pt Loading and Electrode Composition Effects in PEM Fuel Cells

Modeling and Experimental Validation of Pt Loading and Electrode Composition Effects in PEM Fuel Cells

Ionic Conduction in Lithium Ion Battery Composite Electrode Governs Cross-sectional Reaction Distribution

A New Algorithm Design for the Real-time Electrochemical Impedance Monitoring System

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