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Title: A new composite cathode for intermediate temperature solid oxide fuel cells with zirconia-based electrolytes

Authors:
; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1397401
Grant/Contract Number:
AR0000492
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 342; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:10:04; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Zhang, Cuijuan, and Huang, Kevin. A new composite cathode for intermediate temperature solid oxide fuel cells with zirconia-based electrolytes. Netherlands: N. p., 2017. Web. doi:10.1016/j.jpowsour.2016.12.084.
Zhang, Cuijuan, & Huang, Kevin. A new composite cathode for intermediate temperature solid oxide fuel cells with zirconia-based electrolytes. Netherlands. doi:10.1016/j.jpowsour.2016.12.084.
Zhang, Cuijuan, and Huang, Kevin. Wed . "A new composite cathode for intermediate temperature solid oxide fuel cells with zirconia-based electrolytes". Netherlands. doi:10.1016/j.jpowsour.2016.12.084.
@article{osti_1397401,
title = {A new composite cathode for intermediate temperature solid oxide fuel cells with zirconia-based electrolytes},
author = {Zhang, Cuijuan and Huang, Kevin},
abstractNote = {},
doi = {10.1016/j.jpowsour.2016.12.084},
journal = {Journal of Power Sources},
number = C,
volume = 342,
place = {Netherlands},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jpowsour.2016.12.084

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • LaGaO{sub 3}-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO{sub 3}-based oxide was investigated. The LaGaO{sub 3}-based oxide was found to be very stable in reducing, oxidizing, and CO{sub 2} atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO{sub 3}-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO{sub 3} (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in themore » Ln site of the Co-based perovskite cathode also had a significant effect on the power-generation characteristics. In particular, a high power density could be attained in the temperature range 973--1,273 K by using a doped SmCoO{sub 3} for the cathode. Among the examined alkaline earth cations, Sr-doped SmCoO{sub 3} exhibits the smallest cathodic overpotential resulting in the highest power density. The electrical conductivity of SmCoO{sub 3} increased with increasing Sr doped into the Sm site and attained a maximum at Sm{sub 0.5}Sr{sub 0.5}CoO{sub 3}. The cathodic overpotential and internal resistance of the cell exhibited almost the opposite dependence on the amount of doped Sr. Consequently, the power density of the cell was a maximum when Sm{sub 0.5}Sr{sub 0.5}CoO{sub 3} was used as the cathode. For this cell, the maximum power density was as high as 0.58 W/cm{sup 2} at 1,073 K, even though a 0.5 mm thick electrolyte was used. This study revealed that a LaGaO{sub 3}-based oxide for electrolyte and a SmCoO{sub 3}-based oxide for the cathode are promising components for SOFCs operating at intermediate temperature.« less
  • Thin film electrolytes of bilayer bismuth oxide/ceria are developed for intermediate temperature solid oxide fuel cells. Y 0.25Bi 0.75O 1.5 is deposited via Direct Current magnetron sputtering technique on an Sm 0.2Ce 0.8O 1.90 electrolyte film which is prepared by a dry-pressing process on an NiO–Sm 0.2Ce 0.8O 1.90 substrate. La 0.85Sr 0.15MnO 3-δ–Y 0.25Bi 0.75O 1.5 composite is applied onto the Y 0.25Bi 0.75O 1.5 film as the cathode to form a single cell. Cells with 6-μm-thick Y 0.25Bi 0.75O 1.5 and 26-μm-thick Sm 0.2Ce 0.8O 1.90 bilayer electrolytes exhibit improved open circuit voltages and power density compared withmore » those obtained with only Sm 0.2Ce 0.8O 1.90 electrolytes. The open circuit voltages are comparable and power densities are higher than those previously reported for solid oxide fuel cells with thick bilayer electrolytes using noble metals such as Pt as the electrodes. Impedance spectra show that the change of electrolyte resistance is negligible while the cathodic interfacial polarization resistance decreased significantly when the Y 0.25Bi 0.75O 1.5 layer is added to form the Sm 0.2Ce 0.8O 1.90/Y 0.25Bi 0.75O 1.5 bilayer electrolytes.« less
  • Co-doped ceria of Ce{sub 1-x}Gd{sub x-y}Y{sub y}O{sub 2-0.5x}, wherein x = 0.15 and 0.2, 0 {<=} y {<=} x, were prepared by glycine-nitrate method. Their structures and ionic conductivities were characterized by X-ray diffraction (XRD) and AC impedance spectroscopy (IS). All the electrolytes were found to be ceria-based solid solutions of fluorite type structures. Co-doping was found to effectively enhance the conductivity. In comparison to the singly doped ceria, the co-doped ceria showed much higher ionic conductivities at 673-973 K. At 773 K, the ionic conductivity of Ce{sub 0.8}Gd{sub 0.05}Y{sub 0.15}O{sub 1.9} is 0.013 S cm{sup -1} which is threemore » times as high as that of Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9}. These Gd{sup 3+}and Y{sup 3+} co-doped ceria are ideal electrolyte materials of intermediate temperature solid oxide fuel cells (SOFCs)« less
  • La{sub 1-x}Sr{sub x}CuO{sub 2.5-{delta}} (LSCu), which exhibit excellent electrical conductivity and oxygen vacancies were investigated as potential cathode materials for solid oxide fuel cell (SOFC) applications. The structure stability, electrical conductivity, cathodic overpotential, and the reactivity with yttria-stabilized zirconia (YSZ) were examined in this study. It was found that the LSCu perovskite was obtained only when the addition of strontium fell in the range between 15 and 30%. With more than 20% of strontium addition, this material showed excellent electrical property and immunity to the reaction with YSZ at 800 deg. C. The conductivities of LSCu were as high asmore » 900 S/cm at 600 deg. C, and 800 S/cm at 800 deg. C. The cathodic overpotential of this material was approximately 3.8 and 10.6 mV at a current density of 100 mA/cm{sup 2} at 850 and 750 deg. C, respectively. These properties are superior to Sr-doped lanthanum manganite (LSM), which is the state-of-the-art cathode material of SOFCs.« less
  • The polarization behaviors of porous samaria-doped ceria anodes coupled with zirconia electrolytes with various ionic conductivities ({sigma}{sub ion}) were investigated. The exchange current density, j{sub 0}, on such mixed-conducting SDC anodes was not influenced by the {sigma}{sub ion} at 900 and 1,000 C, whereas j{sub 0} increased proportionally to {sigma}{sub ion} at a lower temperature of 800 C. However, the dispersion of nanometer-sized ruthenium catalysts on SDC particles resulted in an increase of j{sub 0} with increase in {sigma}{sub ion} in the entire temperature range between 800 and 1,000 C. The observations are well explained kinetically, i.e., the anode performancemore » is controlled by the rate of O{sup 2{minus}} supply to the anode layer via the electrolyte, as the anodic reaction rate becomes sufficiently high due to highly dispersed Ru electrocatalysts. Consequently, it is clear that the use of high-performance electrodes in combination with the solid electrolyte having high {sigma}{sub ion} is a prerequisite to achieving high performance of solid oxide fuel cells.« less