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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TLDR
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
Citations
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Journal ArticleDOI
A highly coking-resistant solid oxide fuel cell with a nickel doped ceria: Ce1−xNixO2−y reformation layer
TL;DR: In this paper, a single phase mixed oxide ion-electron conducting electrochemical catalyst of Ce 1− x Ni x O 2− y is employed as an anode functional reformation layer for a coking-resistant solid oxide fuel cell (SOFC) based on oxide ion conducting electrolyte operated in methane and ethanol.
Journal ArticleDOI
A case study of the effect of grain size on the oxygen permeation flux of BSCF disk-shaped membrane fabricated by thermoplastic processing
Mehdi Salehi,Mehdi Salehi,Frank Clemens,Ewald M. Pfaff,Stefan Diethelm,Colin Leach,Thomas Graule,Bernard Grobéty +7 more
TL;DR: In this paper, electron backscattered diffraction (EBSD) and conductive mode (CM) microscopy methods were used for texture analysis and observation of the local electrical behavior in BSCF membranes, respectively.
Journal ArticleDOI
Enhancing Oxygen Reduction Reaction Activity and CO2 Tolerance of Cathode for Low-Temperature Solid Oxide Fuel Cells by in Situ Formation of Carbonates.
Ateeq Ur Rehman,Mengran Li,Ruth Knibbe,Muhammad Shirjeel Khan,Vanessa K. Peterson,Helen E. A. Brand,Zhiheng Li,Wei Zhou,Zhonghua Zhu +8 more
TL;DR: The results revealed that the formation of Li\K carbonates boost the ORR activity with an area specific resistance (ASR) as low as 0.12 and 0.18 Ω cm2 at 600 ᵒC, respectively, which are the highest performance of cobalt-free single-phase cathode that have been ever reported by far.
Journal ArticleDOI
Pr-Doping Motivating the Phase Transformation of the BaFeO3-δ Perovskite as a High-Performance Solid Oxide Fuel Cell Cathode.
Yunjie Gou,Guangdong Li,Rongzheng Ren,Chunming Xu,Jinshuo Qiao,Wang Sun,Kening Sun,Zhenhua Wang +7 more
TL;DR: In this article, the phase transformation of BaFeO3-δ perovskites, achieved by doping Pr at the B site, remarkably enhanced electrochemical activity and CO2 resistance are achieved.
Journal ArticleDOI
Match of thermal performances between the membrane and the support for supported dense mixed-conducting membranes
TL;DR: In this paper, a crack-free supported mixed-conducting membrane (composite 60.wt.%SrCo 0.4 Fe 0.5 Zr 0.1 O 3− δ /40.wt) was successfully prepared by the dry-pressing technique directly on a support with the different composition.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.