The effect of humidity and oxygen partial pressure on degradation of Pt/C catalyst in PEM fuel cell

Bi, Wu; Sun, Qiang; Deng, Yulin; Fuller, Thomas F.

doi:10.1016/j.electacta.2008.10.008

Cited by 137 publications

(94 citation statements)

References 22 publications

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“…The result implies that rates of O 2 chemical and electrochemical oxidation with carbon black at 30 • C are very slow. This is consistent with the conclusion that the effect of oxygen partial pressure on cathode degradation is insignificant [30]. Thus the O 2 does not contribute to CSC significantly in this DEMS study.…”

Section: Oxygen Gas Effects On Cscsupporting

confidence: 91%

Analysis of oxygen sources and reaction pathways of carbon support corrosion at the cathode in PEMFC using oxygen-18 DEMS

Lane

2010

Electrochimica Acta

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Section: Oxygen Gas Effects On Cscsupporting

confidence: 91%

Analysis of oxygen sources and reaction pathways of carbon support corrosion at the cathode in PEMFC using oxygen-18 DEMS

Lane

2010

Electrochimica Acta

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“…Numerous publications deal with the different aspects of degradation and their mitigation. [20][21][22][23][24][25][26][27][28][29] For ionomer degradation, two main routes are known, chemical and mechanical degradation. Both can lead to a loss of performance or even a total failure of a cell.…”

Section: F3140mentioning

confidence: 99%

High-Resolution Analysis of Ionomer Loss in Catalytic Layers after Operation

Morawietz

Handl

Oldani

et al. 2018

J. Electrochem. Soc.

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The function of catalytic layers in fuel cells and electrolyzers depends on the properties of the ionically conductive phase, which are most commonly perfluorinated ionomers based on Nafion and Aquivion. An analysis by atomic force microscopy reveals that the ultrathin ionomer films around Pt/C agglomerates have a thickness distribution ranging from 3.5 nm to 20 nm. Their conductivity and gas permeation properties determine the fuel cell performance to a large extend. For electrodes in Aquivion-based membraneelectrode-assemblies operation-induced structure changes were investigated by means of material-and conductivity-sensitive atomic force microscopy, infrared spectroscopy and electron-dispersive X-ray analysis. The observed thinning of the ultrathin ionomer films was mainly caused by polymer degradation deduced from reduced swelling after long-time operation and a significant loss of ionomer with operation time detected by infrared spectroscopy. From the linear thickness increase of the ultrathin films with rising humidity, a mainly layered structure of the ionomer was deduced. An influence of thickness of such ultrathin ionomer films on fuel cell lifetime was found by analysis of differently prepared membrane-electrode-assemblies, where a linear increase of irreversible degradation rate with ionomer film thickness in the electrodes of unused membrane-electrode-assemblies was found.

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“…These include particle growth [16] (loss of electrochemically active area) by agglomeration [85] and Ostwald ripening [86], and also loss of Pt which might occur via Pt dissolution [87] and subsequent deposition in the membrane (chemical reduction by crossover hydrogen) [86,88], precipitation in the cathode ionomer phase [86], or detachment of whole Pt particles from the support as observed in half-cell measurements employing liquid electrolytes [89]. It is not surprising that these degradation effects depend on the conditions, for example, humidity and oxygen partial pressure [90].…”

Section: Electrocatalyst Degradationmentioning

confidence: 99%