High performance cathode-supported SOFC with perovskite anode operating in weakly humidified hydrogen and methane

Chen, X.J.; Liu, Q.L.; Chan, Siew Hwa; Brandon, Nigel P.; Khor, K.A.

doi:10.1016/j.elecom.2006.11.012

Cited by 82 publications

(39 citation statements)

References 21 publications

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“…Even with these losses, the maximum power densities in CH 4 ͑Gd, Ce͒O 2−x nanoparticle impregnated LSCM have achieved 158 W cm −2 power output and 0.44 ⍀ cm 2 polarization resistance at 1073 K in humidified methane. 21,22 It is important to recognize that the anode compositions used in the present study are not the only factor leading to the significantly improved electrode performance. Structure is clearly critical.…”

Section: B17mentioning

confidence: 99%

Engineering Composite Oxide SOFC Anodes for Efficient Oxidation of Methane

Kim

Corre

Irvine

et al. 2008

Electrochem. Solid-State Lett.

142

120

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Section: B17mentioning

confidence: 99%

Engineering Composite Oxide SOFC Anodes for Efficient Oxidation of Methane

Kim

Corre

Irvine

et al. 2008

Electrochem. Solid-State Lett.

142

120

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“…In the Cu-based anodes, Cu is believed only to provide electronic conductivity, while ceria is the mixed conductor and oxidation catalyst responsible for electrochemical oxidation of the fuel. The Mn-doped lanthanum strontium chromite (La 0.75 Sr 0.25 Mn 0.5 Cr 0.5 O 3 ) investigated by Tao and Irvine (13,14), has been infiltrated with Gd-doped ceria by other research groups, where they reported that an improved performance in various fuels was achieved (16,17). Infiltration with ceria nanoparticles, in Ni-YSZ based anodes, has also showed sustained sulphur tolerance when operating on humidified H 2 fuel containing 40 ppm H 2 S (18).…”

Section: Introductionmentioning

confidence: 99%

Strontium Titanate-based Composite Anodes for Solid Oxide Fuel Cells

et al. 2008

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Surfactant-assisted infiltration of Gd-doped ceria (CGO) in Nb-doped SrTiO3 (STN) was investigated as a potential fuel electrode for solid oxide fuel cells (SOFC). An electronically conductive backbone structure of STN was first fabricated at high temperatures and then combined with the mixed conducting and electrochemically active nano-sized CGO phase at low temperatures. Symmetrical cell measurements at open circuit voltage (OCV), showed that the electrochemical activity was maintained or even improved compared to Ni/YSZ fuel electrodes. The novel electrode had an electrode polarization resistance of 0.12 Ωcm2 and 0.44 Ωcm2 in humidified H2 at 850 ºC and 650 ºC, respectively. In addition, the ceramic composite electrode was shown to be redox stable. The electrode was actually activated with redox cycles at 650 ºC. The ceramic electrode structure thus presents a potential solution to overcome some of the major limitations of the current Ni-YSZ cermet SOFC anodes.

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“…7 as the model, in which i o is considered to be independent of P O 2 . The difference begins to be noticeable at higher i, e.g., Ͼ0.50 A/cm 2 . This trend appears to suggest a more pronounced P O 2 dependence of i o at higher current densities.…”

Section: Resultsmentioning

confidence: 98%

“…where r 2 . 9 To be more accurate, the higher dependence closer to T 1.65 should also be considered to account for the collision integral ⍀.…”

Section: Cathode Polarization Modelmentioning

confidence: 99%

Cathode Polarizations of a Cathode-Supported Solid Oxide Fuel Cell

Huang

Zampieri

Ise

2010

J. Electrochem. Soc.

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The concentration, activation, and total polarizations of the cathode in a cathode-supported solid oxide fuel cell (SOFC) were theoretically and experimentally investigated. In the theoretical analysis, the exchange current density of the charge transfer was considered to be dependent on the PnormalO2 determined by the preceding normalO2 diffusion, resulting in an interrelationship between activation and concentration polarizations. The established nonlinear polarization equations were then applied to solve the key parameters with area specific resistances and overpotentials of the polarizations experimentally measured by electrochemical impedance spectroscopy on an operating cathode-supported SOFC. To ensure the consistency and meaningfulness of the solutions, the limiting current density in the concentration polarization equation was first solved, followed by the exchange current density of the activation polarization equation using the predetermined limiting current density. The model was finally verified by comparing the directly measured total overpotentials with the calculated ones using the obtained parameters. The agreement between the two favorably supported the proposed cathode polarization model.

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High performance cathode-supported SOFC with perovskite anode operating in weakly humidified hydrogen and methane

Cited by 82 publications

References 21 publications

Engineering Composite Oxide SOFC Anodes for Efficient Oxidation of Methane

Engineering Composite Oxide SOFC Anodes for Efficient Oxidation of Methane

Strontium Titanate-based Composite Anodes for Solid Oxide Fuel Cells

Cathode Polarizations of a Cathode-Supported Solid Oxide Fuel Cell

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