Lifetime of PEMFCs

Jörissen, Ludwig; Lehnert, Werner; Garche, J.; Tillmetz, Werner

doi:10.4028/www.scientific.net/msf.539-543.1303

Cited by 9 publications

(6 citation statements)

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“…Thus during the last years a significant amount of research work has been done to investigate PEMFC degradation mechanisms and mitigation strategies. Up-to-date overviews on PEMFC degradation are given in [1][2][3][4]. For a long time the focus has been less on GDL ageing but different studies concerning the lifetime of fuel cells have rather investigated reaction layer, membrane and bipolar plate ageing.…”

Section: Introductionmentioning

confidence: 99%

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Seidenberger

Wilhelm

Schmitt

et al. 2011

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Seidenberger

Wilhelm

Schmitt

et al. 2011

Journal of Power Sources

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“…In the literature, most of the existing durability data is taken under varying operating conditions, making comparisons among data-sets difficult [42]. Accordingly, standard durability-evaluation protocols, which are of great value to the fuelcell community, are beginning to appear.…”

mentioning

confidence: 99%

Graphitic Carbon as Durable Cathode‐Catalyst Support for PEFCs

et al. 2011

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Long‐term deterioration in the performance of PEFCs is attributed largely to reduction in active area of the platinum catalyst at cathode, usually caused by carbon‐support corrosion. It is found that the use of graphitic carbon as cathode‐catalyst support enhances its long‐term stability in relation to non‐graphitic carbon. This is because graphitic‐carbon‐supported‐Pt (Pt/GrC) cathodes exhibit higher resistance to carbon corrosion in‐relation to non‐graphitic‐carbon‐supported‐Pt (Pt/Non‐GrC) cathodes in PEFCs during accelerated stress test (AST) as evidenced by chronoamperometry and carbon dioxide studies. The corresponding change in electrochemical surface area (ESA), cell performance and charge‐transfer resistance are monitored through cyclic voltammetry (CV), cell polarisation and impedance measurements, respectively. The degradation in performance of PEFC with Pt/GrC cathode is found to be around 10% after 70 h of AST as against 77% for Pt/Non‐GrC cathode. It is noteworthy that Pt/GrC cathodes can withstand even up to 100 h of AST with nominal effect on their performance. X‐ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy and cross‐sectional field‐emission scanning electron microscopy (FE‐SEM) studies before and after AST suggest lesser deformation in catalyst layer and catalyst particles for Pt/GrC cathodes in relation to Pt/Non‐GrC cathodes, reflecting that graphitic carbon‐support resists carbon corrosion and helps mitigating aggregation of Pt‐particles.

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“…In the literature, 60 most of the existing durability data are taken under varying operating conditions, making comparisons among data sets difficult. Accordingly, standard durability-evaluation protocols, which are of great value to the fuel-cell community, are beginning to appear.…”

mentioning

confidence: 99%

A Durable Graphitic-Carbon Support for Pt and Pt₃Co Cathode Catalysts in Polymer Electrolyte Fuel Cells

Selvaganesh

Sridhar

Pitchumani

et al. 2012

J. Electrochem. Soc.

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The high efficiency of fuel-cell-powered electric vehicles makes them a potentially viable option for future transportation. Polymer Electrolyte Fuel Cells (PEFCs) are most promising among various fuel cells for electric traction due to their quick start-up and low-temperature operation. In recent years, the performance of PEFCs has reached the acceptable level both for automotive and stationary applications and efforts are now being expended in increasing their durability, which remains a major concern in their commercialization. To make PEFCs meet automotive targets an understanding of the factors affecting the stability of carbon support and platinum catalyst is critical. Alloying platinum (Pt) with first-row transition metals such as cobalt (Co) is reported to facilitate both higher degree of crystallinity and enhanced activity in relation to pristine Pt. But a major challenge for the application of Pt-transition metal alloys in PEFCs is to improve the stability of these binary catalysts. Dissolution of the non-precious metal in the acidic environment could alleviate the activity of the catalysts and hence cell performance. The use of graphitic carbon as cathode-catalyst support enhances the long-term stability of Pt and its alloys in relation to non-graphitic carbon as the former exhibits higher resistance to carbon corrosion in relation to the latter in PEFC cathodes during accelerated-stress test (AST). Changes in electrochemical surface area (ESA), cell performance and charge-transfer resistance are monitored during AST through cyclic voltammetry, cell polarization and impedance measurements, respectively. Studies on catalytic electrodes with X-ray diffraction, Raman spectroscopy and transmission electron microscopy reflect that graphitic carbon-support resists carbon corrosion and helps mitigating aggregation of Pt and Pt 3 Co catalyst particles.

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Lifetime of PEMFCs

Cited by 9 publications

References 0 publications

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Graphitic Carbon as Durable Cathode‐Catalyst Support for PEFCs

A Durable Graphitic-Carbon Support for Pt and Pt₃Co Cathode Catalysts in Polymer Electrolyte Fuel Cells

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Lifetime of PEMFCs

Cited by 9 publications

References 0 publications

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Estimation of water distribution and degradation mechanisms in polymer electrolyte membrane fuel cell gas diffusion layers using a 3D Monte Carlo model

Graphitic Carbon as Durable Cathode‐Catalyst Support for PEFCs

A Durable Graphitic-Carbon Support for Pt and Pt3Co Cathode Catalysts in Polymer Electrolyte Fuel Cells

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A Durable Graphitic-Carbon Support for Pt and Pt₃Co Cathode Catalysts in Polymer Electrolyte Fuel Cells