Electrochemical Behaviors of Mixed Conducting Oxide Anodes for Solid Oxide Fuel Cell

Nakamura, Takashi; Kobayashi, Tatsumasa; Yashiro, Keiji; Kaimai, Atsushi; Otake, Takanori; Sato, Kazuhisa; Mizusaki, Junichiro; Kawada, Tatsuya

doi:10.1149/1.2901047

Cited by 71 publications

(72 citation statements)

References 50 publications

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“…27,47 CeO 2 anode showed a reaction order of 0.5 toward P H2 . 26 The resistance of (LaSr)(CrFe)O 3 introduced by Tao increased 50% when reducing P H2 from 0.4 to 0.1 atm.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Gong

Liu

2014

J. Electrochem. Soc.

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Redox-stable ceramic electrodes, Co and Ni doped yttrium chromites, for solid oxide fuel cell (SOFC) are characterized by electrochemical impedance spectroscopy (EIS) in various P O2 and P H2 atmosphere. The polarization resistances for Y 0.8 Ca 0.2 Cr 0.8 Co 0.2 O 3-δ (YCCC) and Y 0.8 Ca 0.2 Cr 0.9 Ni 0.1 O 3-δ (YCCN) on yttrium stabilized zirconia (YSZ) electrolyte are 0.96 and 8.4 cm 2 in wet H 2 , 1.2 and 36.7 cm 2 in air at 850 • C, respectively. For the anode application, the rate-limiting steps (RDS) are identified as charge transfer and surface diffusion for both YCCC and YCCN. The primary active zone in YCCN is three-phase boundary (3PB) but extends to a small portion of the electrode bulk in the YCCC anode. For the cathode application, O 2 dissociative adsorption or diffusion is one of the RDS for both electrodes, and the active zone is limited to the 3PB area. The influence of electrolyte to electrode performance is investigated by replacing YSZ electrolyte with scandium stabilized zirconium (SSZ). Smaller polarization resistances are observed on each electrode in both wet H 2 and air atmospheres. Replacement of electrolyte can alter not only the rate of charge transfer process but also in some cases other surface processes not related to the electrolyte directly. It is proposed that the impact of the electrolyte on each electrode process is passed down as in a chain and the charge transfer step functions as the first ring in the chain. The best performance is obtained with the YCCC/SSZ combination, 0.49 and 1 cm 2 in wet H 2 and air at 850 • C, respectively, making YCCC a promising electrode.Yttrium chromites were proposed as alternative interconnect materials in SOFC applications due to the advantages found in its chemical compatibility with YSZ electrolyte and smaller chemical expansion. [1][2][3][4] With high tolerance to the reducing atmosphere, they can also work as excellent parent materials so that different transition metals whose oxides are otherwise not stable in the typical anode atmosphere can be incorporated into the chromium site. By substitution of yttrium and/or chromium site elements, the thermal expansion coefficient, electrical conductivity and catalytic property could be tailored to meet the anode requirements. 5-7 Recently, Ca & Co co-doped YCrO 3 (Y 0.8 Ca 0.2 Cr 0.8 Co 0.2 O 3-δ ) was developed successfully as an anode candidate by Yoon et al. 7 Decent performance and good tolerance toward S-poisoning were demonstrated: a 0.3 cm 2 polarization resistance for the fuel cell operated at 850 • C in H 2 with 20 ppm H 2 S.Besides this pioneering study on the performance of this material system, investigations regarding other electrochemical properties of such materials are still limited in literature. The catalytic mechanism study among these investigations is crucial to understand the reaction pathway and guide the optimization of the materials. For instance, the oxygen reduction reaction (ORR) of typical perovskite cathodes like (LaSr)MnO 3 (LSM) 8-12 and (LaSr)(CoFe)O 3 (LSCF) 13-1...

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“…27,47 CeO 2 anode showed a reaction order of 0.5 toward P H2 . 26 The resistance of (LaSr)(CrFe)O 3 introduced by Tao increased 50% when reducing P H2 from 0.4 to 0.1 atm.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Gong

Liu

2014

J. Electrochem. Soc.

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“…6. The data from the present work are collected under fuel-cell relevant conditions (98% H 2 , 2% H 2 O); literature results 15,[28][29][30][31][32][33][34] correspond to similar but not always identical gas atmospheres. Even in the absence of metal catalysts, the activity of the nanostructured SDC lm exceeds that of any previous result reported in the open literature.…”

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confidence: 99%

Robust nanostructures with exceptionally high electrochemical reaction activity for high temperature fuel cell electrodes

Jung

Choi

et al. 2014

Energy Environ. Sci.

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Metal nanoparticles are of significant importance for chemical and electrochemical transformations due to their high surface-to-volume ratio and possible unique catalytic properties. However, the poor thermal stability of nano-sized particles typically limits their use to low temperature conditions (<500 C).Furthermore, for electrocatalytic applications they must be placed in simultaneous contact with percolating ionic and electronic current transport pathways. Broader contextSolid oxide fuel cells (SOFCs) provide unparalleled fuel-to-electric conversion efficiency across power scales, from a few milliwatts to hundreds of megawatts. A key barrier to widespread SOFC deployment has been high cost, in part attributable to the high temperature of operation, typically in the 800-1000 C range.Lower temperature operation, in turn, has been hindered by poor electrocatalysis rates. Here we demonstrate SOFC anodes with unprecedented activity for both hydrogen and methane electro-oxidation at 600 C. The innovation lies in the use of nanostructured ceria in combination with ultra-low loadings (11 mg cm À2 ) of catalytic metals: Pt, Pd, Ni or Co. Despite the nanoscale features, the activity experiences negligible degradation over a continuous measurement period of 120 h. This work sets the stage for the adoption of high efficiency SOFCs for the cost-effective utilization of natural gas in electric power generation.

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“…Other studies are mainly focused on electrochemical testing of perovskite based SOFC anodes [10e12]. Based upon variety of impedacne measurements, Nakamura et al [10] have shown that perovskite oxides anodes possess significant pseudocapacitances which is related to the variation of oxygen content. On the other hand, Miller et al [11] have studied the effect of B-site doping on the structure and the electrochemical performance, and concluded that these anodes have very promising electrocatalytic activity, and therefore, the optimization of the microstructure may lead to an improved anode performance.…”

Section: Introductionmentioning

confidence: 99%

Towards understanding surface chemistry and electrochemistry of La 0.1 Sr 0.9 TiO 3-α based solid oxide fuel cell anodes

Yurkiv

Constantin

Hornés

et al. 2015

Journal of Power Sources

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Electrochemical Behaviors of Mixed Conducting Oxide Anodes for Solid Oxide Fuel Cell

Abstract: To clarify guidelines for a high-performance mixed conducting oxide anode, electrochemical behaviors of mixed conducting oxide anodes were studied on the oxides, La 0.

Cited by 71 publications

References 50 publications

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Robust nanostructures with exceptionally high electrochemical reaction activity for high temperature fuel cell electrodes

Towards understanding surface chemistry and electrochemistry of La 0.1 Sr 0.9 TiO 3-α based solid oxide fuel cell anodes

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