XPS investigations of the proton exchange membrane fuel cell active layers aging: Characterization of the mitigating role of an anodic CO contamination on cathode degradation

Parry, Valérie; Berthomé, G.; Joud, J.C.; Lemaire, Olivier; Franco, Alejandro A.

doi:10.1016/j.jpowsour.2010.11.027

Cited by 43 publications

(27 citation statements)

References 38 publications

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“…During the potential cycling, the ratio of CF 2 /CeC decreases, especially at elevated temperature. This is a clear evidence of the ionomer backbone degradation and dissolution, as reported by other groups as well [28,29]. This agrees well with the increasing amount of CeC, since more carbon is getting exposed at the surface.…”

Section: Catalyst Ionomer Electrode (Cie)supporting

confidence: 90%

X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

Andersen

Dhiman

Skou

2015

Journal of Power Sources

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Section: Catalyst Ionomer Electrode (Cie)supporting

confidence: 90%

X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

Andersen

Dhiman

Skou

2015

Journal of Power Sources

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“…Foradetailed explanation and mitigation strategies of ACC, the reader is referred to the existing literature. [6][7][8][9][10][11][12][13][14][15] This mechanism, however, only describest he electrochemical carbono xidationa tt he air electrode.C orrosion at the fuel electrodei sn ot mentioned nor explained by it. In this study we will demonstrate that carbon corrosion not only takes place at the fuel electrode, but it can actually exceed the oxidation rates measured at the air electrode.…”

Section: Introductionmentioning

confidence: 99%

Fuel Electrode Carbon Corrosion in High Temperature Polymer Electrolyte Fuel Cells—Crucial or Irrelevant?

2015

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In this study the cause and effect of fuel electrode carbon corrosion in high temperature polymer electrolyte fuel cells are highlighted for the first time. Here, measurements of the CO2 concentration in the fuel electrode effluent and spatially resolved current mapping suggest that the reverse‐current decay mechanism, which is responsible for the well‐known air electrode carbon corrosion, is not responsible for the observed fuel electrode carbon corrosion. We propose a chemical carbon oxidation mechanism, caused by the alternating exposure of the fuel electrode to hydrogen and air during start‐up/shut‐down cycling. Furthermore, a degradation study was performed which indicates a severe performance decrease, up to 40 %, due to fuel electrode carbon corrosion after 600 start‐up/shut‐down events under reformate conditions.

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“…[25,41] Thermodynamicsp redicts that electrochemical carbon corrosion can occur at relatively low potentials, that is, the carbon dioxide/carbon standard potential E 0 CO 2 /C = 0.207 Vv ersus the reversible hydrogen electrode (RHE). The C1ss pectra had two dominant peaks at binding energies (BEs) of 284.3 and 291.7 eV.T he first peak was assigned to the CÀCbonds of the graphitized carbon of the catalyst support, [42] whereas the second peak was assigned to the CÀF 2 bonds of the Nafion polytetrafluoroethylene (PTFE) backbone with minor contributionsf rom the CF 3 and COF 2 groups. [25] The extent of carbon corrosion was monitored by XPS measurementso ft he electrode surface before and after dissolution.…”

Section: Carbonsurfacecompositionmentioning

confidence: 99%

Environmentally Friendly Carbon‐Preserving Recovery of Noble Metals From Supported Fuel Cell Catalysts

2015

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The dissolution of noble-metal catalysts under mild and carbon-preserving conditions offers the possibility of in situ regeneration of the catalyst nanoparticles in fuel cells or other applications. Here, we report on the complete dissolution of the fuel cell catalyst, platinum nanoparticles, under very mild conditions at room temperature in 0.1 M HClO4 and 0.1 M HCl by electrochemical potential cycling between 0.5-1.1 V at a scan rate of 50 mV s(-1) . Dissolution rates as high as 22.5 μg cm(-2) per cycle were achieved, which ensured a relatively short dissolution timescale of 3-5 h for a Pt loading of 0.35 mg cm(-2) on carbon. The influence of chloride ions and oxygen in the electrolyte on the dissolution was investigated, and a dissolution mechanism is proposed on the basis of the experimental observations and available literature results. During the dissolution process, the corrosion of the carbon support was minimal, as observed by X-ray photoelectron spectroscopy (XPS).

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XPS investigations of the proton exchange membrane fuel cell active layers aging: Characterization of the mitigating role of an anodic CO contamination on cathode degradation

Cited by 43 publications

References 38 publications

X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

Fuel Electrode Carbon Corrosion in High Temperature Polymer Electrolyte Fuel Cells—Crucial or Irrelevant?

Environmentally Friendly Carbon‐Preserving Recovery of Noble Metals From Supported Fuel Cell Catalysts

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