An experimental prediction of the preparation condition of Nafion-coated catalyst layers for PEFCs

Watanabe, Masahiro; Igarashi, Hiroshi; Yosioka, Koji

doi:10.1016/0013-4686(94)00271-2

Cited by 131 publications

(111 citation statements)

References 19 publications

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“…Measurements at Pt/C reveal higher deviation from a 4-electron transfer (3.872). This is probably due to inherent layer properties such as non-adequate thickness of the Nafion binder 15,16 and/or high surface area of catalyst support 17 that may induce additional mass transport limitation in comparison to measurement at a smooth bulk catalyst electrode. In the kinetic-controlled region, Pt 3 Cr/C shows about 10 mV less overpotential for ORR at 2 mA cm −2 and 0.85 V compared to the commercial catalyst.…”

Section: Resultsmentioning

confidence: 99%

Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC

Mariappan

Radev

Peinecke

et al. 2015

J. Electrochem. Soc.

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In the present work, a 40 wt% Pt 3 Cr/C alloy catalyst showed enhanced activity under both half-cell and full-cell conditions as well as excellent corrosion stability compared to those of the 40 wt% Pt/C benchmark catalyst. In half-cell experiments at 2 mA cm −2 , Pt 3 Cr/C catalyst exhibited 10 mV less over-potential and twofold higher specific and mass activity for ORR than Pt/C. The average particle size grew from 4.5 nm up to "only" 6-8 nm after 7000 degradation cycles. For comparison, average particle size of Pt/C increased from 4.5 up to 10-30 nm. After 1000 degradation cycles in full-cell, MEA with Pt 3 Cr/C cathode exhibits an excellent maximum power density retention of about 94% compared to only 59% for the MEA with the commercial catalyst.

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Section: Resultsmentioning

confidence: 99%

Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC

Mariappan

Radev

Peinecke

et al. 2015

J. Electrochem. Soc.

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“…Indeed, the diffusion coefficient of oxygen is sufficiently large, so that oxygen can diffuse efficiently through the ionomer towards the Pt sites up to ∼200 nm [19] (compared to ∼1 nm interface thickness) and the reaction rate is not controlled by mass transport limitations in the Nafion coating. Furthermore, this interface is considered immaterial and therefore unable of accumulating mass and charge, namely,…”

Section: Introductionmentioning

confidence: 99%

A Continuum Model for Water Transport in the Ionomer-Phase of Catalyst Coated Membranes for PEMFCs

Gurau

Mann

2010

Advances in Mechanical Engineering

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We study the problem of water transport in the ionomer-phase of catalyst coated membranes (CCMs) for proton exchange membrane fuel cells (PEMFCs), where microscopic-scale phenomena at the distributed interfaces between structural components control the water management. Existing models for water transport in CCMs describe the transport in systems which consist exclusively of an ionomer-phase. Interfacial water fluxes across distributed interfaces representing various mechanisms of water transfer between ionomer and catalyst layer pores are not captured properly in these models. Here we develop a continuum model for water transport in CCMs using the method of volume averaging. Water is exchanged between ionomer and the catalyst layer pores by electro-osmotic discharge (EOD) through the three-phase boundary (TPB) regions and by sorption and desorption across the ionomer-pore interfaces. While the former mechanism does not affect directly the water content in the ionomer-phase, it represents an effective mechanism for water transfer during fuel cell operation and controls directly the water saturation in the catalyst pores.

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“…For kinetic studies, the electrocatalysts are usually covered by a protonic conductor membrane to reproduce the conditions observed in the fuel cell. In most cases a unique membrane was used [4][5][6][7][8][9][10], but recently new arrangements with a multilayer membrane were proposed [11][12][13]. However, the formalism for an appropriate interpretation of these results has not been developed yet.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Hydrogen Oxidation Reaction on Membrane Coated Electrodes. Part I: Theoretical Aspects

Marozzi¹,

Chialvo²,

Chialvo

2009

TOELECJ

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Abstract:A generalized theoretical analysis of the kinetics of the hydrogen oxidation reaction under the VolmerHeyrovsky-Tafel mechanism on an electrode covered by polymeric films is presented. The treatment includes the diffusion of the molecular hydrogen through the electrolyte solution, as well as through the different layers and interfaces. On the light of the resulting expressions, the applicability of the Levich-Koutecky diagrams for the determination of the kinetic current densities was critically analyzed.

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An experimental prediction of the preparation condition of Nafion-coated catalyst layers for PEFCs

Cited by 131 publications

References 19 publications

Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC

Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC

A Continuum Model for Water Transport in the Ionomer-Phase of Catalyst Coated Membranes for PEMFCs

Kinetic Study of the Hydrogen Oxidation Reaction on Membrane Coated Electrodes. Part I: Theoretical Aspects

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An experimental prediction of the preparation condition of Nafion-coated catalyst layers for PEFCs

Cited by 131 publications

References 19 publications

Highly Active and Stable Pt3Cr/C Alloy Catalyst in H2-PEMFC

Highly Active and Stable Pt3Cr/C Alloy Catalyst in H2-PEMFC

A Continuum Model for Water Transport in the Ionomer-Phase of Catalyst Coated Membranes for PEMFCs

Kinetic Study of the Hydrogen Oxidation Reaction on Membrane Coated Electrodes. Part I: Theoretical Aspects

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Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC

Highly Active and Stable Pt₃Cr/C Alloy Catalyst in H₂-PEMFC