Materials Literature
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SOFCs with GDC electrolytes present challenges for stack modeling due to the variation in conductivity and chemical activity of GDC as a function of effective oxygen partial pressure P O2 , which varies significantly down the channel in SOFC anodes with increasing fuel utilization. This paper presents a 3-D model for…
We developed the high durability coating for SOFC metal interconnectors. The method is anion type electrodeposition coating, and the material of coating is spinel type oxide. Generally, electrodeposition coating is used to form the resin based coating, but we successfully increase the amount of ceramics in the film an…
Our group has attempted to construct an SOFC multiscale model which can simulate inelastic deformation under operating conditions. In this study, we have focused on mechanical properties of Ni-YSZ anode and aimed to identify creep parameter which is a key factor of inelastic deformation. Measurements were performed at…
This paper reports a comprehensive understanding of the electrochemical polarization processes that determine the performance of reformate fueled Solid Oxide Fuel Cells with Ni/8YSZ anodes. State-of-the-art anode supported cells manufactured by Research Center Jülich (FZJ) were analyzed via electrochemical impedance s…
Solid oxide fuel cell attracts much attention due to its advantages such as high efficiency and low carbon emission. For a typical Ni/YSZ anode, it is essential to understand the relationship between performance and microstructure of Ni/YSZ interface and Ni/YSZ/pore triple-phase boundary. Herein, the crystallographic…
The perovskite-oxides, such as (La,Sr)CoO 3 and (Ba,Sr)CoO 3 , have received much attention in recent years as cathode materials for intermediate temperature-solid oxide fuel cells (IT-SOFCs). In this study, we have investigated the structural, electrical, electrochemical, and redox properties of Sm 0.5 Sr 0.5 Co 1- x…
A steam electrolysis method using Solid Oxide Electrolysis Cell (SOEC) is re-emerging as the state-of-the art technology since water molecules are easier to split into hydrogen and oxygen molecules at high temperature. However, delamination problems have been reported between GDC (Gd 0.2 CeO 2-x ) interlayer and YSZ (…
The complex relationship between the microstructure of the mixed ionic-electronic conductor La 0.6 Sr 0.4 CoO 3- δ (LSC) and the electrode performance has been investigated on a quantitative level. Symmetric half-cells and single cells with various LSC microstructures were formed using series of raw cathode powders wi…
Ce 0.6 La 0.4 O 2 (40LDC) is considered as a material for the interlayer between Ni-cermet anodes and LaGaO 3 based electrolytes in solid oxide fuel cells. The oxygen nonstoichiometry of 40LDC was measured as a function of oxygen partial pressure P (O 2 ) and temperature by thermogravimetry. The decrease of weight due…
Low-temperature SOFCs with thick-film anodes such as those developed by Ceres Power for its metal supported SOFC are inherently more resistant to REDOX cycling as a result of loss of fuel supply at temperature than traditional SOFC designs. This is due to the slow kinetics of nickel oxidation at low temperature and th…
Carbon-air fuel cells are a prospective technology for efficient and environmentally-benign conversion of the chemical energy of solid carbonaceous fuels directly to electrical energy. Since Ni-YSZ anodes used in conventional (H 2 /O 2 ) solid oxide fuel cells (SOFCs) are irreversibly affected by sulphur poisoning and…
Long term durability and reliability tests of five different types of SOFCs and stacks, which have been developed by Kyocera, MHI, MMC/KEPCO, Tokyo-gas and TOTO, were carried out under the NEDO project (FY2008–2012). In this paper, we report the result of durability tests of segment-in series tubular type SOFC stacks…
Carbon accumulation (coking) normally occurs at the Ni-yttria stabilized zirconia (YSZ) cermet anode of solid oxide fuel cells (SOFCs) when they are operated on carbon-containing fuels, such as syngas (H 2 + CO). Here we show that the addition of ppm levels (4-17 ppm) of H 2 S to a syngas stream, at 600 o C and even a…
The influence of electron localization on the chemical expansion coefficient was examined experimentally, using a model electrode material, (La,Sr)(Ga,Ni)O 3-δ . Varying the Ni content yielded differing degrees of electron localization with resultant chemical expansion coefficients evaluated by dilatometry and thermog…
Direct fuel utilization, pressurization and reversibility are three operating characteristics enabling solid oxide fuel cells (SOFCs) for a broad spectrum of applications. Direct uitilization of practical fuels for the SOFC has been demonstrated. For example, high electrochemical performance (a peak power density of a…
In recent years magnesium (Mg) and its alloys are being increasingly investigated as alternatives to iron and aluminum to reduce the weight of structural materials in automotive applications. Relatively poor corrosion resistance of Mg has severely limited the growth of magnesium in automobiles. Coatings via electro-de…
We present three-dimensional kinetic Monte Carlo (KMC) simulations based on Q-state Potts model in order to numerically predict the microstructural evolution of the Ni-YSZ composite system. By incorporating a new densification algorithm into a previous sintering modeling, we have successfully simulated the effect of t…
An elementary kinetic model is established to represent the coupled behavior of (electro)-chemistry, transport and degradation processes in the porous Ni/YSZ anode of solid oxide fuel cells (SOFC). The model is applied to support the development and evaluation of solid carbon formation mechanisms at Ni/YSZ anodes. The…
A model of a hybrid power plant consisting of SOFC and a gas turbine is presented. Simulations are carried out for a different number of SOFC stacks while keeping the output power of the SOFC constant. Results show that the effect of stack number on system performance is only marginal within the investigated range. Op…
ABSTRACT The emulsification efficiency of PS‐co‐TMI, a copolymer polymerized by styrene and 3‐isopropenyl‐α,α‐dimethylbenzene isocyanate (TMI), for polystyrene (PS)/polyamide 6 (PA6) blend was studied. During the mixing process, an effective emulsifier PS‐g‐PA6 was generated, which was demonstrated by differential sca…