Nanoscale Phenomena in Catalyst Layers for PEM Fuel Cells: From Fundamental Physics to Benign Design

Chan, Kalok; Roudgar, Ata; Wang, Liya; Eikerling, Michael

doi:10.1002/9780470630693.ch10

Cited by 1 publication

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References 144 publications

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“…39 This compactness of highly oriented catalyst surfaces may also introduce other new physical mechanisms to enhance activity and durability as modeled recently by the Eikerling group. [40][41][42] That the NSTF electrodes have catalyst surface area distributions better suited for more efficient oxygen reduction (capture and entrapment) has precedence with protein adsorption on similar structures. 43 In that work, Protein A, human IgG and Bovine serum albumin were adsorbed on four types of metal coated NSTF whiskers, Pt, Fe, CoCr, Cu, similar to those shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of Electrode Surface Area Distribution on High Current Density Performance of PEM Fuel Cells

Debe¹

2011

J. Electrochem. Soc.

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Commercialization of automotive fuel cells requires current densities of 1.5 A/cm 2 above 650 mV with Pt loadings of 0.125 mg Pt /cm 2 or less. Loss of high current density with cathode loadings below 0.2 mg Pt /cm 2 in Pt/C electrodes is an issue that current kinetic/transport models are reported inadequate to explain. We show that this effect is much less at a given loading with the NSTF catalyst type electrodes and explain these differences using a model based on elementary kinetic gas theory and known molecule/surface interaction mechanisms that take place in the Knudsen regime. The result is an additional pre-exponential scaling factor f(d s ) in the Butler-Volmer equation related to a distance metric d s describing the catalyst surface area distribution. We approximate this distance metric by the inverse of the surface area per unit volume of the electrode and define and test two possible functional forms for f(d s ). The preferred form is able to predict the correct heat of enthalpy for O 2 physisorption and the observed ratio of current densities at V(iR-free) = 0.7 V for NSTF compared to Pt/C dispersed electrodes in the 0.05 to 0.15 mg Pt /cm 2 range from published data for eleven different catalyst types and cathode loadings below 0.2 mg/cm 2 .

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Section: Discussionmentioning

confidence: 99%

Effect of Electrode Surface Area Distribution on High Current Density Performance of PEM Fuel Cells

Debe¹

2011

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

Nanoscale Phenomena in Catalyst Layers for PEM Fuel Cells: From Fundamental Physics to Benign Design

Cited by 1 publication

References 144 publications

Effect of Electrode Surface Area Distribution on High Current Density Performance of PEM Fuel Cells

Effect of Electrode Surface Area Distribution on High Current Density Performance of PEM Fuel Cells

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