Optimized energy conversion efficiency in solid-oxide fuel cells implementing SrMo1−xFexO3−δ perovskites as anodes

Martínez-Coronado, R.; Alonso, J. A.; Aguadero, Ainara; Fernández‐Díaz, M. T.

doi:10.1016/j.jpowsour.2012.02.002

Cited by 60 publications

(49 citation statements)

References 23 publications

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“…It is worth comparing with some measurements with identical electrolyte and anode but different cathode. For instance we can mention a very similar study performed with SrCo 0.8 Fe 0.2 O 3Àd as cathode and the same anode (SMFO) [8], where a maximum power of 0.7 mW/ cm 2 was achieved at 850 C.…”

Section: Fuel-cell Testsmentioning

confidence: 91%

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New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

Cascos

Martínez-Coronado

Alonso

2014

International Journal of Hydrogen Energy

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Section: Fuel-cell Testsmentioning

confidence: 91%

“…Single cell tests were carried out using LSGM pellets as electrolyte, SrCo 0.95 Nb 0.05 O 3Àd (SCNO) as cathode material, and SrMo 0.8 Fe 0.2 O 3Àd (SMFO) as anode material, recently developed in our group [8]. The LSGM pellets of 20-mm diameter were sintered at 1450 C for 20 h and then polished with a diamond wheel to a thickness of 300 mm.…”

Section: Methodsmentioning

confidence: 99%

New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

Cascos

Martínez-Coronado

Alonso

2014

International Journal of Hydrogen Energy

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“…Single cell tests were carried out using firstly La 0.8 Sr 0.2 Ga 0.83 Mn 0.17 O 3Àd (LSGM) pellets as electrolyte, oxidized La 0.5 Sr 0.5 Co 0.5 Ti 0.5 O 3 (LSCT) as cathode material, and SrMo 0.8 Fe 0.2 O 3 (SMFO) as anode material [28], secondly SrFe 0.2 Co 0. 8 O 3Àd (SFCO) as cathode and reduced La 0.5 Sr 0.5 Co 0.5 Ti 0.5 O 3Àd as anode and finally with LSCT simultaneously as cathode (oxidized) and anode (reduced).…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, single cells have been set up and tested using SrMo 0.8 Fe 0.2 O 3Àd (SMFO) as anode [28] with La 0.5 Sr 0.5 Co 0.5 Ti 0.5 O 3Àd (LSCT) as cathode; secondly we have tested a reduced LSCT specimen as anode, combined with SrFe 0.2 Co 0.8 O 3Àd as cathode and finally, we tested the LSCT as symmetrical electrode (anode and cathode), using in all cases La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3Àd (LSGM) as electrolyte. We report on the results of a complete characterization study including the electrical performance of the single cells, dilatometry, conductivity and the structural characterization from NPD data, which is a powerful tool [29] to examine, in situ, the electrode materials under the usual conditions of a SOFC.…”

Section: Introductionmentioning

confidence: 99%

Characterization of La0.5Sr0.5Co0.5Ti0.5O3−δ as symmetrical electrode material for intermediate-temperature solid-oxide fuel cells

Martínez-Coronado

Aguadero

Pérez-Coll

et al. 2012

International Journal of Hydrogen Energy

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“…SrMo 0.8 Fe 0.2 O 3-δ (SMFO) was used as the anode material, recently developed in our group, 22 . Pt gauze with a small amount of Pt paste was used as current collector at both the anodic and the cathodic sides for ensuring electrical contact.…”

Section: F3020mentioning

confidence: 99%

Design of Sr_0.7R_0.3CoO_3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cells

Cascos

Aguadero

Harrington

et al. 2017

J. Electrochem. Soc.

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Sr 0.7 R 0.3 CoO 3-δ (R = Tb and Er) tetragonal perovskites have been prepared and evaluated as mixed ionic-electronic cathodes for SOFC. Neutron powder diffraction (NPD) measurements evidenced that both compounds are oxygen hypo-stoichiometric with long-range order of oxygen vacancies that leads to a tetragonal perovskite-type superstructure (s.g. I4/mmm) stable within the whole temperature range under study. The oxygen vacancies located mainly in the equatorial oxygen positions exhibit large displacement factors. The high oxygen mobility in Sr 0.7 Tb 0.3 CoO 3-δ was confirmed by 18 O oxygen labeling followed by Secondary Ion Mass Spectrometry (SIMS) with values of oxygen self-diffusion of 1.29 × 10 −10 cm 2 /s at 525 • C. Polarization resistances with LSGM as electrolyte gave values as low as 0.011 ·cm 2 and maximum output powers of 570 mW/cm 2 at 850 • C were obtained in test cells set in electrolyte-supported configuration. Electrical conductivity, thermal and chemical expansion and stability measurements confirm the potential of these materials as cathodes for SOFC. Nowadays it is frequent to hear about the so-called "hydrogen economy", which is based on replacing fossil fuels with this gas. The combustion of hydrogen is clean and releases more energy than any other fuel per unit weight. The utilization of hydrogen as an energy vector relies on the replacement of the current couple constituted by "hydrocarbon fuel-combustion engine" by the "hydrogen-fuel cell" binomial. Among the fuel cells, solid oxide fuel cells (SOFC) are intended to be used for stationary applications and exhibit a superior performance compared to other fuel-cell types.1-3 For practical reasons it would be ideal the reduction of the SOFC operating temperature to lower temperatures (650-850• C) without detriment of the cell efficiency. Therefore, it is essential to innovate in electrode materials in order to enhance their catalytic properties and their mixed ionic-electronic conductivity, achieving much faster kinetics for the two half-reactions. 4 In this work we have designed, prepared and characterized new mixed ionic-electronic conductors (MIECs) based on the family of perosvkites Sr 0.7 R 0.3 CoO 3-δ (R = Tb and Er) as cathode materials for SOFC.Cobalt-based perovskite compounds have attracted huge attention as IT-SOFC (intermediate-temperature SOFC) cathodes due to their mixed-conducting characteristics and high ion-conductivity in the intermediate temperature range. [5][6][7] Due to their properties, hightemperature SrCoO 3-δ phases with cubic 3C-like crystal structures (where the CoO x coordination polyhedra share corners) are presented as mixed conductors with very high oxygen permeability. 8,9 Unfortunately, this cubic polymorph is not stable below 900• C where a 3C-cubic to 2H-hexagonal phase transition takes place when the material undergoes a slow cooling process. In the 2H-hexagonal phase, characterized by a tolerance factor higher than 1, the crystal structure contains columns of CoO 6 octahedra sharing faces, which is det...

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Optimized energy conversion efficiency in solid-oxide fuel cells implementing SrMo1−xFexO3−δ perovskites as anodes

Cited by 60 publications

References 23 publications

New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

Characterization of La0.5Sr0.5Co0.5Ti0.5O3−δ as symmetrical electrode material for intermediate-temperature solid-oxide fuel cells

Design of Sr_0.7R_0.3CoO_3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cells

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Optimized energy conversion efficiency in solid-oxide fuel cells implementing SrMo1−xFexO3−δ perovskites as anodes

Cited by 60 publications

References 23 publications

New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

New Nb-doped SrCo1−xNbxO3−δ perovskites performing as cathodes in solid-oxide fuel cells

Characterization of La0.5Sr0.5Co0.5Ti0.5O3−δ as symmetrical electrode material for intermediate-temperature solid-oxide fuel cells

Design of Sr0.7R0.3CoO3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cells

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Design of Sr_0.7R_0.3CoO_3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cells