Improvement of PEFC Diagnostics for Elucidation of Degradation Factor in the Same Electrode

Isami, Chiari; Sugiura, Kanematsu; Daigo, Akihiko; Murakami, T.

doi:10.1149/1.4705493

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The PPDS, composed of A/D converter and pulse generator, measured the transient responses of four cells simultaneously in 28.2msec. Here, this measuring time was determined by determination coefficient [3]. The obtained transient response was converted to CSV data and sent to the PC by USB cable, and the fitting parameter was delivered by analyzing this CSV data.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Figure 2 shows Polarization distribution in cell by presence of humidifying. Here, the upper left, the upper right, the lower left and the lower right of the graph show y0 parameter that means I-V performance, ⊿V parameter that means the resistance polarization, A1 parameter that means the activation polarization and t1 parameter that means the diffusion polarization [3], respectively. In both conditions, A1 and t1 parameter grow toward the gas outlet from the gas inlet under the total current density region though ⊿V parameter decreases.…”

Section: Influence Of Humidifying On Each Polarization In a Same Elec...mentioning

confidence: 99%

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Elucidation of Degradation Factor Distribution in a Same Electrode on PEFC

Sugiura¹,

Daigo²,

Murakami³

2016

ECS Trans.

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Our proposal diagnostics evaluates the PEFC’s transient response with a resistance polarization, an activation polarization and a diffusion polarization, and derives diagnostics parameters by analyzing this transient response. Because we have already clarified that this diagnostics system was able to diagnose the 25cm2 PEFC single cell, we tried to elucidate the degradation factor distribution in the same electrode by applying it to the quadrisection separator. As a result, our diagnostics was able to judge the difference of the degradation factor in each section in the same electrode such as the resistance polarization is the highest at the gas upper stream, the activation polarization is the lowest at the middle section and the diffusion polarization is the highest at the gas downstream.

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Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Section: Influence Of Humidifying On Each Polarization In a Same Elec...mentioning

confidence: 99%

Elucidation of Degradation Factor Distribution in a Same Electrode on PEFC

Sugiura¹,

Daigo²,

Murakami³

2016

ECS Trans.

View full text Add to dashboard Cite

show abstract

“…The PPDS composed of an A/D converter and a pulse generator measured the transient responses of four cells simultaneously in 28.2msec. Here, this measuring time was determined by determination coefficient [3]. The obtained transient response was converted to CSV data and sent to the PC by USB cable, and the fitting parameter was delivered by analyzing this CSV data.…”

Section: Methodsmentioning

confidence: 99%

Grasp of Correlation between Degradation Factor and Cell Position of PEFC Stack

Matsumoto¹,

Sugiura²,

Daigo³

et al. 2016

ECS Trans.

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The cost reduction and the improvement of a life performance are necessary for the dissemination of Polymer Electrolyte Fuel Cell (PEFC). If the degradation of the fuel cell was able to be diagnosed at the early stage, the life performance can be improved by applying appropriate processing to PEFC. We have been proposing the PEFC Performance Diagnose System (PPDS) which diagnoses the state of each polarization (the resistance polarization, the activation polarization and the diffusion polarization) by analyzing transient response with Turuga Electric Corporation since 2002. Since 2014, the application of our PPDS to a PEFC short stack was tried because it was able to diagnose each degradation factor of a PEFC single cell. As a result, the PPDS not only found out a degradation cell in the four cells short stack but also was able to diagnose the degradation factor of this deteriorated cell. Therefore, this paper aims to grasp the correlation between the degradation factor and the cell position of the PEFC Short Stack using our PPDS, and the PPDS was able to find the unit with the deteriorated cell when it diagnoses each unit composed of four cells in the stack. As a result, because we elucidated the correlation between the degradation factor and the cell position of a stack, we can propose the structure of a PEFC stack where deteriorating is not caused easily. Moreover, we can apply our PPDS as a maintenance device for a fuel cell vehicle and a domestic use fuel cell.

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“…3, and it was defined as the resistance polarization. As a result of deterioration diagnosis under various conditions by this method, and the relation between each parameter and each polarization has been clarified as the following; V  parameter, A 1 parameter and t 1 parameter mean the resistance polarization, the activation polarization and the diffusion polarization, respectively [3]. The conventional diagnostics has been diagnosing the deteriorating situation of various cells using these parameters ( V  , A 1 and t 1 ) as diagnostic parameters.…”

Section: Diagnostic Principlementioning

confidence: 99%

“…Since 2013, we have improved a diagnostic accuracy by removing the anode polarization from our diagnostic because the anode polarization was considerably small compared with the cathode polarization and it is generally known well that most fuel cells are controlled by the cathode reaction. The results of the improved diagnostics were corresponding to the results of the Cole-Cole plot [1][2][3]. Additionally, this diagnostic system was applied to a PEFC short stack and the four segmented separator as shown in Figs.…”

Section: Introduction mentioning

confidence: 97%

Improvement of Algorithm of Diagnostics for PEFC Performance

Sugiura¹,

Kinoshita²,

Yoshitani³

et al. 2018

JMEA

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Recently, polymer electrolyte fuel cell (PEFC) begins to be used in a lot of fields such as automotive industry and power generation etc. Therefore our laboratory developed the simple maintenance equipment which can diagnose a performance degradation of PEFC instantaneously by analyzing transient response at a current interruption. However, because it was not able to diagnose some operating conditions, we determined that it was necessary to improve the diagnostic algorithm. Therefore we developed a new algorithm which sequentially approximates diagnostic parameters by the on-line algorithm of the method of least squares. The adequacy of a new algorithm was verified using a PEFC single cell of 25 cm 2 applied about two Membrane Electrode Assemblies (MEAs) ((a) 10 mg, (b) 7.5 mg) with different amount of platinum. As a result, we judged that this algorithm was able to apply to the new diagnostics because it distinguished the difference of two MEAs in each parameter.

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Improvement of PEFC Diagnostics for Elucidation of Degradation Factor in the Same Electrode

Cited by 4 publications

References 2 publications

Elucidation of Degradation Factor Distribution in a Same Electrode on PEFC

Elucidation of Degradation Factor Distribution in a Same Electrode on PEFC

Grasp of Correlation between Degradation Factor and Cell Position of PEFC Stack

Improvement of Algorithm of Diagnostics for PEFC Performance

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