Journal ArticleDOI
A high-performance cathode for the next generation of solid-oxide fuel cells
Zongping Shao,Sossina M. Haile +1 more
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BSCF is presented as a new cathode material for reduced-temperature SOFC operation and demonstrated that BSCF is ideally suited to ‘single-chamber’ fuel-cell operation, where anode and cathode reactions take place within the same physical chamber.Abstract:
Fuel cells directly and efficiently convert chemical energy to electrical energy. Of the various fuel cell types, solid-oxide fuel cells (SOFCs) combine the benefits of environmentally benign power generation with fuel flexibility. However, the necessity for high operating temperatures (800–1,000 °C) has resulted in high costs and materials compatibility challenges. As a consequence, significant effort has been devoted to the development of intermediate-temperature (500–700 °C) SOFCs. A key obstacle to reduced-temperature operation of SOFCs is the poor activity of traditional cathode materials for electrochemical reduction of oxygen in this temperature regime2. Here we present Ba_(0.5_Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-delta) (BSCF) as a new cathode material for reduced-temperature SOFC operation. BSCF, incorporated into a thin-film doped ceria fuel cell, exhibits high power densities (1,010 mW cm^(-2) and 402 mW cm^(-2) at 600 °C and 500 °C, respectively) when operated with humidified hydrogen as the fuel and air as the cathode gas. We further demonstrate that BSCF is ideally suited to 'single-chamber' fuel-cell operation, where anode and cathode reactions take place within the same physical chamber. The high power output of BSCF cathodes results from the high rate of oxygen diffusion through the material. By enabling operation at reduced temperatures, BSCF cathodes may result in widespread practical implementation of SOFCs.read more
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Journal ArticleDOI
Perovskite membrane of La1−xSrxTi1−yFeyO3−δ for partial oxidation of methane to syngas
Yosuke Takahashi,Akihiro Kawahara,Takehiro Suzuki,Masayoshi Hirano,Woosuck Shin,Woosuck Shin +5 more
TL;DR: In this paper, the substitution of Fe for Ti, and substitution of Sr for La increased the p-type electronic and oxygen ionic conductivities to 155 and 0.47% respectively.
Journal ArticleDOI
Grain-size dependence of the deterioration of oxygen transport for pure and 3 mol% Zr-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ induced by thermal annealing
TL;DR: In this article, the influence of long-term annealing at intermediate temperatures on oxygen transport of Ba0.5Sr 0.5Co0.8Fe0.2O3 d (BSCF) and 3 mol% Zr-doped BSCF-Z3) ceramics with different grain sizes was studied by means of in situ electrical conductivity relaxation (ECR) measurements.
Journal ArticleDOI
Multichannel mixed‐conducting hollow fiber membranes for oxygen separation
TL;DR: A multichannel mixed-conducting hollow fiber (MMCHF) membrane, 0.5 wt % Nb2O5-doped SrCo0.8 Fe0.2O3-d (SCFNb), has been successfully prepared by phase inversion and sintering technique.
Journal ArticleDOI
Substituent effects of Ba2+ for Sm3+ on the structure and electrochemical performances of Sm0.5Sr0.5Co0.8Fe0.2O3−δ cathode for intermediate temperature solid oxide fuel cells
TL;DR: In this article, a perovskite oxides with orthorhombic symmetry were synthesized by a citric acid method and the X-ray diffractometer, Infrared spectroscopy and Raman spectroscopic results suggest an increase in the cell volume with Ba content.
Journal ArticleDOI
Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La0.6Sr0.4Co0.2Fe0.8O3-δ versus Ba0.5Sr0.5Co0.8Fe0.2O3-δ
A. Giuliano,Maria Paola Carpanese,Maria Paola Carpanese,Davide Clematis,Marta Boaro,Alfonsina Pappacena,Francesca Deganello,Leonarda F. Liotta,Antonio Barbucci,Antonio Barbucci +9 more
References
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Journal ArticleDOI
Materials for fuel-cell technologies
TL;DR: Recent progress in the search and development of innovative alternative materials in the development of fuel-cell stack is summarized.
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Appraisal of Ce1−yGdyO2−y/2 electrolytes for IT-SOFC operation at 500°C
TL;DR: In this article, the authors evaluated thermodynamic and electrical conductivity data to select the most appropriate electrolyte composition for IT-SOFC operation at 500°C and found that the Gd 3+ ion is the preferred dopant, compared to Sm 3+ and Y 3+, at this temperature.
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Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen membrane
TL;DR: In this article, a combined citrate-EDTA complexing method was used for the preparation of SCFO and Ba0.2O3-delta (BSCFO) oxides, and the results of O-2-TPD and XRD showed that the introduction of barium into SCFO could effectively suppress the oxidation of Co3+ and Fe3+ to higher valence states of Co4 and Fe4+ in the lattice and stabilize the perovskite structure under lower oxygen partial pressures.
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Recent Advances in Materials for Fuel Cells
TL;DR: In this paper, material requirements for SOFC and PEMFC stacks, together with an introductory section on materials technology for reformers, are discussed, and it is concluded that the introduction of alternative materials/processes that would enable SOFC stacks to operate at 150-200°C, and IT-SOFC stacks at 500-700°C would have a major impact on the successful commercialization of fuel cell technology.
Journal ArticleDOI
A low-operating-temperature solid oxide fuel cell in hydrocarbon-Air mixtures
Takashi Hibino,Atsuko Hashimoto,Takao Inoue,Jun-ichi Tokuno,Shin-ichiro Yoshida,Mitsuru Sano +5 more
TL;DR: The performance of a single-chamber solid oxide fuel cell was studied using a ceria-basedsolid electrolyte at temperatures below 773 kelvin, where the solid electrolyte functioned as a purely ionic conductor.