Strontium Titanate-based Composite Anodes for Solid Oxide Fuel Cells

Blennow, Peter; Hansen, Kent Kammer; Wallenberg, L. Reine; Mogensen, Mogens Bjerg

doi:10.1149/1.3050390

Cited by 36 publications

(30 citation statements)

References 20 publications

(35 reference statements)

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“…Symmetrical cells were prepared with electrodes comprised of porous Sr 0.94 Ti 0.9 Nb 0.1 O 3 (STN) backbones coated with Ce 0.8 Gd 0.2 O 1.9 by surfactantassisted nitrate solution inltration, on both sides of a YSZ electrolyte, as described in ref. 33. Pt paste was applied to both electrodes for current collection.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of CO/CO₂ and H₂/H₂O reactions at Ni-based and ceria-based solid-oxide-cell electrodes

2015

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Document Version Peer reviewed version Link back to DTU Orbit Citation (APA):Graves, C. R., Chatzichristodoulou, C., & Mogensen, M. B. (2015). Kinetics of CO/CO2 and H2/H2O reactions at Ni-based and ceria-based solid-oxide-cell electrodes. Faraday Discussions, 182, Comparing model and porous Ni-SZ electrodes, the ratio of electrode polarization resistance in CO/CO 2 vs. H 2 /H 2 O decreases from 33 to 2. Experiments and modelling suggest that the ratio decreases due to a lower concentration of impurities blocking the three phase boundary and due to the nature of the reaction zone extension into the porous electrode thickness. Besides showing higher activity for H 2 /H 2 O reactions than CO/CO 2 reactions, the Ni/SZ interface is more active for oxidation than reduction. On the other hand, we find the opposite behaviour in both cases for CGOn/STN model electrodes, reporting for the first time a higher electrocatalytic activity of CGO nanoparticles for CO/CO 2 than for H 2 /H 2 O reactions in the absence of gas diffusion limitations. We propose that enhanced surface reduction at the CGOn/gas two phase boundary in CO/CO 2 and in cathodic polarization can explain why the highest reaction rate is obtained for CO 2 electrolysis. For all materials investigated, large differences

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Section: Methodsmentioning

confidence: 99%

Kinetics of CO/CO₂ and H₂/H₂O reactions at Ni-based and ceria-based solid-oxide-cell electrodes

2015

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“…(14). Table I shows the different compounds that were investigated by infiltration in symmetrical cells.…”

Section: Catalyst Infiltrationmentioning

confidence: 99%

“…It was shown that the electrochemical activity was maintained or even improved compared to Ni/YSZ fuel electrodes. The electrocatalytic activity and oxygen ECS Transactions, 25 (2) 701-710 (2009) ion transport was believed to be provided by the CGO nano-particle network covering the STN backbone structure whereas the STN backbone structure mainly provided electronic conductivity (14).…”

Section: Introductionmentioning

confidence: 99%

Development of Planar Metal Supported SOFC with Novel Cermet Anode

et al. 2009

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Metal-supported solid oxide fuel cells are expected to offer several potential advantages over conventional anode (Ni-YSZ) supported cells, such as increased resistance against mechanical and thermal stresses and a reduction in materials cost. When Ni-YSZ based anodes are used in metal supported SOFC, electrode material from the active anode layer may interdiffuse with the metallic support during sintering. The purpose of this work is to illustrate how the interdiffusion problem can be circumvented by using an alternative anode design based on porous and electronically conducting layers, into which electrocatalytically active materials are infiltrated after sintering. The paper presents the recent results on the electrochemical performance and durability of the novel planar metal-supported SOFC design. The results presented in the paper show that the novel cell and anode design has a promising performance and durability at a broad range of temperatures and is especially suitable for intermediate temperature operation.

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“…Nb-doped SrTiO 3 has been shown to have high electronic conductivity and promising redox stability (5,6). Combined with infiltration of electrocatalytically active materials the performance of such an anode has been shown to be comparable to conventional Ni-YSZ based anodes (7). In general, various perovskite structured materials as fuel cell anodes have, since a few years back, been proposed as promising candidates for the future (8)(9)(10).…”

Section: Introductionmentioning

confidence: 99%

Metal-Supported SOFC with Ceramic-Based Anode

et al. 2011

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Metal-supported solid oxide fuel cells have shown promise to offer several potential advantages over conventional anode (Ni-YSZ) supported cells, such as increased resistance against mechanical and thermal stresses and a reduction in materials cost. The purpose of this work is to illustrate how the metal-supported cell concept can be combined with ceramic-based anode materials, such as Nbdoped SrTiO 3 . The paper shows that a metal-supported cell can have excellent performance by only having electronically conducting phases in the anode backbone structure, into which electrocatalytically active materials are infiltrated after sintering. Initial area specific resistance as low as 0.3 Ωcm 2 at 700 ºC has been obtained with power densities > 1 Wcm -2 . The initial results on the chemical compatibility, electrochemical performance, and galvanostatic durability of a ceramic based (Nb-doped SrTiO 3 ), zirconia-free anode, in a planar metal-supported SOFC concept are discussed.

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Strontium Titanate-based Composite Anodes for Solid Oxide Fuel Cells

Cited by 36 publications

References 20 publications

Kinetics of CO/CO₂ and H₂/H₂O reactions at Ni-based and ceria-based solid-oxide-cell electrodes

Kinetics of CO/CO₂ and H₂/H₂O reactions at Ni-based and ceria-based solid-oxide-cell electrodes

Development of Planar Metal Supported SOFC with Novel Cermet Anode

Metal-Supported SOFC with Ceramic-Based Anode

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