Solid Oxide Fuel Cells

Guindet, J.; Hammou, A.

doi:10.1201/9781420049305.ch12

Cited by 13 publications

(17 citation statements)

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“…Some of the cell polarisation is due to the cathode and the electrolyte. Therefore, the polarisation of the anode, where the cells start to degrade faster, is likely to be in the same potential range as where anode passivation was reported [13]. It is worth noting that the potential where the Ni electrode starts to passivate is above the Ni-NiO reduction potential.…”

Section: Discussionmentioning

confidence: 81%

“…An earlier investigation, on single point Ni-Zirconia anodes, indicated that the anode passivates at potentials below 800 mV vs. air [13]. Some of the cell polarisation is due to the cathode and the electrolyte.…”

Section: Discussionmentioning

confidence: 97%

“…It is worth noting that the potential where the Ni electrode starts to passivate is above the Ni-NiO reduction potential. This was explained as the partial coverage of NiO on the anode Niparticles [13]. Other investigations on SOFC anodes have shown that Ni-redistribution may occur [2,[14][15][16][17] and that a high anode gas water content accelerates this process [15].…”

Section: Discussionmentioning

confidence: 99%

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Solid Oxide Fuel Cell Performance under Severe Operating Conditions

et al. 2006

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The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE‐SOFC project. The cells were of the anode‐supported type with a double layer LSM cathode. They were operated at 750 °C or 850 °C in hydrogen with 5% or 50% water at current densities ranging from 0.25 A cm–2 to 1 A cm–2 for periods of 300 hours or more. The area specific cell resistance, corrected for fuel utilisation, ranged between 0.20 Ω cm2 and 0.34 Ω cm2 at 850 °C and 520 mV, and between 0.51 Ω cm2 and 0.92 Ω cm2 at 750 °C and 520 mV.The degradation of cell performance was found to be low (ranging from 0 to 8%/1,000 hours) at regular operating conditions. Voltage degradation rates of 20 to 40%/1,000 hours were observed under severe operating conditions, depending on the test conditions.Data analysis revealed a critical cell voltage of ca 750 mV, above which the degradation rates were trivial, but below which they were significant.Some cells were also tested using a different procedure to that usually applied at Risø. This gave a different aging behaviour, indicating that the detailed test circumstances may be decisive to the outcome.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Solid Oxide Fuel Cell Performance under Severe Operating Conditions

et al. 2006

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“…Impedance diagrams of ball shaped Ni electrode, reported by Guindet et al [17], also show two arcs. The reaction rates of the electrochemical oxidation of carbon monoxide (CO + 0 .2 ---) CO2 + 2 e ) measured on Ni-YSZ cermet [11] and Pt-electrodes with CeO2 [10] are slower than the HJH20 reaction.…”

Section: Introductionmentioning

confidence: 86%

Lanthanum chromite as an anode material for solid oxide fuel cells

Vernoux

1997

Ionics

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Abstract. The electrochemical behavior of pure lanthanum chromite and strontium dopedlanthanum chromite was studied by impedance spectroscopy under HJH20, CO/CO2 and CHJH20.Results show that the electrochemical oxidation of H2 is faster than that of CO or CH 4. Strontium doping enhances the anodic activity of the material.The impedance diagrams are composed of two semi-circles. The high frequency one does not appear to be related to a chemical or electrochemical reaction. The low frequency one is linked to the nature and concentration of the electroactive species.

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“…The findings are remarkably inconsistent judging from the number of reported arcs in impedance spectra. Studies from geometrically simple Ni anodes [13][14][15] to comparison of geometrically more complex anodes 16 ͑cermet, coarse-cermet, Nipaste, and Ni-felt͒ have been reported, without pointing to a consistent picture.…”

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confidence: 99%

A Study of Metal (Ni, Pt, Au)/Yttria-Stabilized Zirconia Interface in Hydrogen Atmosphere at Elevated Temperature

Kek

Mogensen

Pejovnik

2001

J. Electrochem. Soc.

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The properties of selected metal ͑Pt, Ni, Au͒/YSZ single crystal interfaces have been investigated by current-voltage measurements and impedance spectroscopy. A three-electrode cell consisting of a quasi-point-contact metal working electrode and Pt reference and counter electrodes were constructed and studied under various conditions. The impedance response consists of at least two processes, both belonging to interfacial properties: a high frequency process with peak frequency between 10 4 and 10 3 Hz, and a low frequency process with peak frequency between 0.5 and 50 Hz. An increase in overall electrochemical reaction rate and in the interfacial capacitance under prolonged anodic polarization was observed. A mechanism based on the spillover of oxide or hydroxide ions on the metal surface is proposed.

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Solid Oxide Fuel Cells

Cited by 13 publications

References 0 publications

Solid Oxide Fuel Cell Performance under Severe Operating Conditions

Solid Oxide Fuel Cell Performance under Severe Operating Conditions

Lanthanum chromite as an anode material for solid oxide fuel cells

A Study of Metal (Ni, Pt, Au)/Yttria-Stabilized Zirconia Interface in Hydrogen Atmosphere at Elevated Temperature

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