Long-Term Electric Conductivity of (Nb,Y)-Doped Bi2O3 Solid Electrolytes for Solid Oxide Fuel Cells

2012 ◽  
Vol 509 ◽  
pp. 111-113 ◽  
Author(s):  
Wen Cheng J. Wei
Keyword(s):  
Phase Transformation ◽  
Solid Oxide Fuel Cells ◽  
Electric Conductivity ◽  
Solid Electrolytes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Surface Evaporation ◽  
Delta Phase ◽  
Phase Retention

Two oxides, Y2O3 and Nb2O5, were doped into Bi2O3-based electrolyte in a composition of (Bi 1-x-y,Nb x,Y y)2O 3, where (x+y)=0.12 to 0.2 and the x:y ratio 3:1 to 1:3. The delta-phase retention, the oxygen vacancy order-disorder transformation, the ionic and electric conductivity were investigated by various techniques. The long-term conductivity of the dense electrolytes was determined showing moderate degradation due to phase transformation possible triggered by surface evaporation of Bi-oxide. The best retention of the conductivity is about 60% after 300 hr test.

scholarly journals Computational engineering of the oxygen electrode-electrolyte interface in solid oxide fuel cells

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Kaiming Cheng ◽  
Huixia Xu ◽  
Lijun Zhang ◽  
Jixue Zhou ◽  
Xitao Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Microstructure Evolution ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Ohmic Loss ◽  
Oxide Fuel ◽  
Computational Engineering ◽  
Electrolyte Interface

AbstractThe Ce0.8Gd0.2O2−δ (CGO) interlayer is commonly applied in solid oxide fuel cells (SOFCs) to prevent chemical reactions between the (La1−xSrx)(Co1−yFey)O3−δ (LSCF) oxygen electrode and the Y2O3-stabilized ZrO2 (YSZ) electrolyte. However, formation of the YSZ–CGO solid solution with low ionic conductivity and the SrZrO3 (SZO) insulating phase still happens during cell production and long-term operation, causing poor performance and degradation. Unlike many experimental investigations exploring these phenomena, consistent and quantitative computational modeling of the microstructure evolution at the oxygen electrode–electrolyte interface is scarce. We combine thermodynamic, 1D kinetic, and 3D phase-field modeling to computationally reproduce the element redistribution, microstructure evolution, and corresponding ohmic loss of this interface. The influences of different ceramic processing techniques for the CGO interlayer, i.e., screen printing and physical laser deposition (PLD), and of different processing and long-term operating parameters are explored, representing a successful case of quantitative computational engineering of the oxygen electrode–electrolyte interface in SOFCs.

scholarly journals Performance and long term durability of metal-supported solid oxide fuel cells

2015 ◽  
Vol 123 (1436) ◽  
pp. 205-212 ◽  
Author(s):  
Chun-Huang TSAI ◽  
Chang-Sing HWANG ◽  
Chun-Liang CHANG ◽  
Sheng-Fu YANG ◽  
Shih-Wei CHENG ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel

Long-term stability of Ni–Sn porous metals for cathode current collector in solid oxide fuel cells

2017 ◽  
Vol 42 (17) ◽  
pp. 12567-12573 ◽  
Author(s):  
Chihiro Hiraiwa ◽  
Hiromasa Tawarayama ◽  
Hajime Ota ◽  
Takahiro Higashino ◽  
Kazuki Okuno ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Collector ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Porous Metals ◽  
Term Stability ◽  
Long Term Stability ◽  
Cathode Current

Development of High Power Density Solid Oxide Fuel Cells (SOFCs) for Long-Term Operation

2010 ◽  
Vol 654-656 ◽  
pp. 2875-2878 ◽  
Author(s):  
Norbert H. Menzler ◽  
Wolfgang Schafbauer ◽  
Feng Han ◽  
Oliver Büchler ◽  
Robert Mücke ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
High Power ◽  
High Efficiency ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Term Operation ◽  
Novel Technologies ◽  
Power Outputs

Solid oxide fuel cells (SOFCs) enable environmentally friendly energy to be produced with high efficiency. The market entry of SOFC systems depends on the functionality of the components and on the costs. The SOFC has not yet reached market maturity. This presentation focuses on the possibilities for manufacturing SOFCs with high power outputs and long-term durability by using manufacturing technologies feasible in industry. For the past 15 years, FZ Jülich has been developing large-size so-called anode-supported SOFCs (up to 200 x 200 mm²) with reproducibly high power output (> 2 A/cm² at 800°C). Novel technologies for high-capacity manufacturing such as tape casting and roller coating have been introduced. Additionally, newly developed thin-film techniques have led to power outputs of more than 3 A/cm² at 800°C and more than 1.5 A/cm² below 700°C. These high power densities open up new possibilities for the operation of SOFCs at low temperatures to ensure low degradation and therefore long lifetimes.

Conductivity Analysis on Hetero-Junction of Multiple Nano-Structural Layers

2013 ◽  
Vol 573 ◽  
pp. 13-17
Author(s):  
Wen Cheng J. Wei
Keyword(s):  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Solid Electrolytes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Cathode Structure ◽  
Electronic Performance ◽  
Co Precipitation ◽  
Ysz Electrolyte ◽  
Perovskite Type

Ionic/electronic performance of various cathodes in contact with solid electrolytes used for intermediate-temperature (500-750°C) solid oxide fuel cells (SOFCs) is investigated. Perovskite-type material, e.g. (La,Sr)(Co,Fe)O3 as abbreviated LSCF, mixed with Gd-doped CeO2 (GDC) particulates in various size ranges has been synthesized by Pichini and co-precipitation methods. The composites are assembled into multilayer cathode structure, which is arranged in a sequence of composite/GDC/ YSZ electrolyte. The microstructure of the interface, electrochemical performance, and interface conductivity of various cell combinations are investigated.

A Review of the Implications of Silica in Solid Oxide Fuel Cells

2011 ◽  
Vol 8 (5) ◽  
Author(s):  
Michael Lankin ◽  
Yanhai Du ◽  
Caine Finnerty
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide Fuel Cell ◽  
Elevated Temperatures ◽  
Raw Materials ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Negative Effects ◽  
Long Term Stability

Silica is a well-known impurity in solid oxide fuel cell raw materials, namely NiO and yttria-stabilized zirconia (YSZ). At elevated temperatures silica will migrate to the grain boundaries, form insulating siliceous phases, and lead to a decrease in the ionic conductivity of the electrolyte. Furthermore, silica impurities have been shown to damage the anode/electrolyte interface, such that an overall decrease in cell performance and long-term stability is observed. Despite the fact that silica is ubiquitous in commercial-grade raw materials and can be incorporated from several extrinsic sources, it has negative effects on the solid oxide fuel cell, such that any further contamination should be avoided to prevent performance degradation and eventual cell failure. This paper reviews and outlines the sources and effects of silica on the solid oxide fuel cell, and attempts to determine a guideline for acceptable levels of silica contamination.

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