Mass transfer phenomena at Nafion coated electrodes: Limits of the membrane model

Porchet, Franck; Javet, Philippe

doi:10.1016/0013-4686(95)00248-d

Cited by 18 publications

(20 citation statements)

References 43 publications

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“…The different amounts of Au@PoPD formed in the Nf-Au@PoPD film were clearly understood from the SEM images. The pinholes present in the plain Nf film [42] were clearly visible from the SEM image (Fig. S-2A).…”

Section: Resultsmentioning

confidence: 88%

Electroless synthesis of multibranched gold nanostructures encapsulated by poly(o-phenylenediamine) in Nafion

Subramani

Ramaraj

2011

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 88%

Electroless synthesis of multibranched gold nanostructures encapsulated by poly(o-phenylenediamine) in Nafion

Subramani

Ramaraj

2011

Journal of Colloid and Interface Science

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“…5C). At the ITO/Nf-PPD electrode, the -SO 3 À cluster regions and pinholes present in the Nf film [43] are completely covered by PPD that leads to the formation of some specific shaped Au nanostructures which are different from those formed at the ITO/PPD and ITO/Nf (Fig. S5C) electrodes during electrodeposition.…”

Section: Sem Xrd and Hrtem Analysismentioning

confidence: 96%

Electrodeposited gold nanostructures at Nafion–poly(o-phenylenediamine) modified electrode and its electrocatalytic application

Rameshkumar¹,

Ramaraj²

2015

Journal of Electroanalytical Chemistry

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“…The Nafion solution was pipetted onto the RDE immediately after cold storage. The filming procedure is essentially that developed by Porchet et al 94 . After allowing the filmed electrode to dry for 12 hr, it was immersed in 0.5 M HClO 4 for 1 hr, at which point the electrode was potential cycled between 1.4 and 0.05 V vs. RHE.…”

Section: Experimental: Peroxide Transport and Dmbe Studiesmentioning

confidence: 99%

“…A calculation of peroxide diffusivity in the polymer film using this model is dependent on the film thickness being known accurately and = 1. The thickness of the polymer film was determined using the empirical correlation of Porchet and Javet 94 . Using = 0.4 µm, the diffusivity of H 2 O 2 in a film of Nafion 117 was calculated to be 6.0 x 10 -7 cm 2 /sec.…”

Section: Equation 55mentioning

confidence: 99%

Final Report - MEA and Stack Durability for PEM Fuel Cells

Yandrasits¹

2008

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The principal objectives of this program were to develop membrane electrode assemblies (MEAs) and systems that are durable up to 40,000 hours under stationary power conditions and at the same time can be manufacture in high volume, commercial processes.All MEA materials, process development work was carried out by 3M Co., at its St. Paul, MN, 3M Center campus and its Menomonie, WI, production plant. The 3M team included primarily members from the Fuel Cell Components Program, but significant assistance was received over Executive SummaryProton exchange membrane fuel cells are expected to change the landscape of power generation over the next ten years. For this to be realized one of the most significant challenges for stationary systems is lifetime, where 40,000 hours of operation with less than 10% decay is desired. This project conducted fundamental studies on the durability of membrane electrode assemblies (MEAs) and fuel cell stack systems with the expectation that knowledge gained from this project will be applied toward the design and manufacture of MEAs and stack systems to meet DOE's 2010 stationary fuel cell stack systems targets.The focus of this project was proton exchange membrane (PEM) fuel cell durabilityunderstanding the issues that limit MEA and fuel cell system lifetime, developing mitigation strategies to address the lifetime issues and demonstration of the effectiveness of the mitigation strategies by system testing. To that end, several discoveries were made that contributed to the fundamental understanding of MEA degradation mechanisms. (1) The classically held belief that membrane degradation is solely due to polymer end-group "unzipping" is incorrect; there are other functional groups present in the ionomer that are susceptible to chemical attack. (2) The rate of membrane degradation can be greatly slowed or possibly eliminated through the use of additives that scavenge peroxide or peroxyl radicals. (3) Characterization of gas diffusion layer (GDL) using dry gases is incorrect due to the fact that fuel cells operate utilizing humidified gases. The proper characterization method involves using wet gas streams and measuring capillary pressure as demonstrated in this project. (4) Not all Platinum on carbon catalysts are created equally -the major factor impacting catalyst durability is the type of carbon used as the support. (5) System operating conditions have a significant impact of lifetime -the lifetime was increased by an order of magnitude by changing the load profile while all other variables remain the same. (6) Through the use of statistical lifetime analysis methods, it is possible to develop new MEAs with predicted durability approaching the DOE 2010 targets. (7) A segmented cell was developed that extend the resolution from ~ 40 to 121 segments for a 50cm2 active area single cell which allowed for more precise investigation of the local phenomena in a operating fuel cell. (8) The single segmented cell concept was extended to a fuel size stack to allow the first of its kind moni...

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Mass transfer phenomena at Nafion coated electrodes: Limits of the membrane model

Cited by 18 publications

References 43 publications

Electroless synthesis of multibranched gold nanostructures encapsulated by poly(o-phenylenediamine) in Nafion

Electroless synthesis of multibranched gold nanostructures encapsulated by poly(o-phenylenediamine) in Nafion

Electrodeposited gold nanostructures at Nafion–poly(o-phenylenediamine) modified electrode and its electrocatalytic application

Final Report - MEA and Stack Durability for PEM Fuel Cells

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