Stable and high conductivity ceria/bismuth oxide bilayer electrolytes for lower temperature solid oxide fuel cells

Park, Jun-Young; Wachsman, Eric D.

doi:10.1007/s11581-006-0010-x

Cited by 55 publications

(29 citation statements)

References 16 publications

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“…Diverse strategies have been explored to enhance the cathodic efficiency, including: (i) the infiltration/impregnation method into a porous scaffold, although this is not adequate for mass industrial use due to the multiple fabrication steps required and long time consuming; and (ii) the optimization of the electrode porosity by the use of sacrificial templates, such as polymer and carbon microspheres, or freeze-casting method [ 24 , 25 ]. Alternatively, (iii) the employ of active layers, such as Bi 2 O 3 –based films and mixed conductors, improves the oxygen transfer at the electrode/electrolyte interfaces and reduces the ohmic losses [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathodes with Different Microstructural Architectures

et al. 2020

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Lowering the operating temperature of solid oxide fuel cells (SOFCs) is crucial to make this technology commercially viable. In this context, the electrode efficiency at low temperatures could be greatly enhanced by microstructural design at the nanoscale. This work describes alternative microstructural approaches to improve the electrochemical efficiency of the BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY) cathode. Different electrodes architectures are prepared in a single step by a cost-effective and scalable spray-pyrolysis deposition method. The microstructure and electrochemical efficiency are compared with those fabricated from ceramic powders and screen-printing technique. A complete structural, morphological and electrochemical characterization of the electrodes is carried out. Reduced values of area specific resistance are achieved for the nanostructured cathodes, i.e., 0.067 Ω·cm2 at 600 °C, compared to 0.520 Ω·cm2 for the same cathode obtained by screen-printing. An anode supported cell with nanostructured BCFZY cathode generates a peak power density of 1 W·cm−2 at 600 °C.

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Section: Introductionmentioning

confidence: 99%

Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathodes with Different Microstructural Architectures

et al. 2020

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“…Other materials, such as gold-based and platinumbased inks have also been constructed for working electrodes on some SPEs for electrochemical POCT applications [54,55]. An et al [52] synthesized a kind of porous gold nanocages (AuNC) with outer and inner walls which can be electrostatic adhered to SPE and modified by thiol aptamers to develop a disposable labelfree aptasensor with low cost and high sensitivity for aflatoxin B1 (AFB1) detection, Figure 4B.…”

Section: Printed Electrodes On Non-paper Substratesmentioning

confidence: 99%

Electrochemical Biosensors Based on Micro‐fabricated Devices for Point‐of‐Care Testing: A Review

Zhang

Zhou

2021

Electroanalysis

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Point-of-care testing (POCT) is becoming a hot research topic that allows rapid, on-site, and non-professional measurements outside the central laboratory. The micro-fabricated devices prepared by various micromachining technologies have shown the advantages of low reagent consumption, high-throughput samples, and wearability. This review presents the recent progress of electrochemical biosensors based on various micro-fabri-cated devices for POCT and the corresponding electrochemical techniques. Signal amplification strategies based on enzyme and nanotechnology are also illustrated for the more sensitive POCT applications of these micro-fabricated devices. Consequently, the trends and challenges of electrochemical biosensors based on micro-fabricated devices in POCT diagnosis are discussed.

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“…The total conductivity of the f = 0.81 sample, as measured by a.c. impedance spectroscopy, was monitored during long-term isothermal annealing at 650 °C in 50 min intervals for ca. 210 h. To minimize electrode degradation during long-term annealing [21,22], sputtered gold electrodes were used.…”

Section: Electrical Measurementsmentioning

confidence: 99%

Structural and electrical properties of Bi 3 Y 0.9 W 0.1 O 6.15 -La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composites

et al. 2017

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Electrical conductivity and structural behavior in Bi 3 Y 0.9 W 0.1 O 6.15-La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composite cathodes for intermediate temperature solid-oxide fuel cells (IT-SOFCs) have been investigated. The ionically conducting component (BiYWO) was selected as it not only exhibits high oxide ion conductivity at intermediate temperatures, but also shows good long-term stability. The LSM component is a well-known electronic conductor, commonly used for SOFC cathodes and also shows high interfacial polarization effects. Both composite components exhibit similar thermal expansion coefficients. Composites of different molar ratios of components were prepared by sintering the components together at 850 °C. Electrical behavior was studied by a.c. impedance spectroscopy and transference number measurements were used to determine the ionic and electronic contributions to total conductivity. Percolation type behavior was observed for total conductivity and the percolation threshold value was determined to be in the bismuth rich region of the compositional range, due to the significant difference in the grain sizes of the two components. Ionic and electronic components of the total conductivity at, above and below the percolation threshold are discussed. Stability measurements on a composition close to the percolation threshold show some degree of conductivity decay on prolonged annealing at 650 °C, which is partly recoverable on heating to higher temperatures.

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Stable and high conductivity ceria/bismuth oxide bilayer electrolytes for lower temperature solid oxide fuel cells

Cited by 55 publications

References 16 publications

Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathodes with Different Microstructural Architectures

Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathodes with Different Microstructural Architectures

Electrochemical Biosensors Based on Micro‐fabricated Devices for Point‐of‐Care Testing: A Review

Structural and electrical properties of Bi 3 Y 0.9 W 0.1 O 6.15 -La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composites

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