Materials Literature
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Terbium and samarium co-doped ceria was studied as electrolyte membrane for intermediate temperature solid oxide fuel cell single cells. The ceramic doped ceria powders with different composition like Ce0.9Sm0.1O2- δ and Ce0.9SmxTbyO2- δ were synthesized using glycine-nitrate thermal decomposition process and the film…
In the present work, the electrochemical performances and the durability of two stacks were compared, the first made by LSCF and the second by Pr2NiO4 cathode materials. Electrochemical evaluation by polarization curves and a 600h durability test, demonstrates almost identical performance of the two stacks, though a m…
The cells composed of strontium-doped lanthanum manganite (LSM) cathode and yttria-stabilized zirconia (YSZ) electrolyte show time-dependent events, such as the performance enhancement and/or deterioration, under polarized states. In this study, the influence of LSM composition on the microstructure of LSM/YSZ interfa…
In this work, Ni/YSZ pattern anodes with well-defined 2-D structure were employed to investigate the electrochemical oxidation of H2, CO and syngas. Electrochemical tests revealed that polarization resistance (Rp) depended on applied overpotenital and gas compositions. In H2/H2O environment, Rp decreases when increasi…
The operational strategy for a solid oxide fuel cell undergoing degradation is investigated in this paper. While the perfect fuel cell would undergo no degradation, practical fuel cells of any type (e.g., polymer electrolyte, etc.), like batteries, will degrade. For fuel cells, dominant mechanisms of degradation will…
Preparation of non-precious metal catalysts (NPMCs) via chemical surface modification of carbon black with 5,6-diamino-1,10-phenanthroline (aphen) was completed. A diazonium coupling reaction was used to covalently attach aphen to the carbon surface and ratios of aphen to carbon were varied. The impact of this loading…
Group 4 and 5 metal oxide-based compounds such as partially oxidized tantalum carbonitride, ZrO2-x, ZrOxNy, TiO2-x, and TaCxNy might be candidates for the new cathode material of polymer electrolyte fuel cells, if they have high catalytic activity for oxygen reduction. These materials are stable in acidic and oxidativ…
The anode in a solid oxide electrolysis cell (SOEC) is often the rate-determining component, in terms of both device performance and degradation rates. In order to improve device characteristics, better electrode materials must be developed. Interstitial oxygen conducting electrodes, such as those in the A2BO4 Ruddles…
Carbon deposition on Ni anode support causes degradation of cell performance. Using an additive is one of possible solutions to suppress carbon deposition on Ni. In this study, the substrate effect for carbon formation was investigated at 1073 K under CH4/H2O/ Ar (S/C = 0.087) using Ni particles dispersed substrate ox…
We analyzed the dependence of X-ray absorption spectra for Co 2p orbital of LaCoO3 on the Hubbard U and lattice parameters by using the density functional theory (DFT) method. The X-ray absorption spectra and partial density of states (PDOS) are studied with the different U parameters ranging from 2.5 to 7.8. The char…
Stability of La substituted SrTiO3 anode in coal syngas fuel was investigated. La0.25Sr0.75TiO3 and (La0.25Sr0.75)0.9TiO3 pellets were annealed in simulated coal syngas with 1 ppm PH3 atmosphere at 900 oC for 100 hrs. Sr3(PO4)2 and TiO2 were observed on the surface of each sample after the exposure test. XRD and SEM/E…
The degradation of Ni anode due to the carbon deposition has been observed when the hydrocarbon fuels are used. The perovskite anodes, on the other hand, are chemically and electrochemically stable under SOFC operating conditions. They exhibit increased resistance to carbon deposition compared to Ni anode. Furthermore…
In situ soft X-ray absorption spectroscopic measurements were performed to evaluate electronic structures of LaCoO3. X-ray absorption spectra at Co L II- and L III-edges were measured under p(O2) = 10-4 bar at room temperature to 873 K. Depending on temperature, the shape and the peak energy of the absorption spectra…
Pr2NiO4-based ceramic oxides are known promising MIEC cathodes material for SOFC, owing to its experimentally found good ionic and electronic conductivity compared with other known materials. In this study, the structural and electronic properties of pure and doped Pr2NiO4-based oxides are investigated through first p…
SOFCOM is an applied research project (FCH JU Grant Agreement 278798) devoted to demonstrate the technical feasibility, the efficiency and environmental advantages of CHP plants based on SOFC fed by different typologies of biogenous primary fuels (locally produced), integrated by a process for the CO2 separation from…
The effect of reducing time on Cu-Ni alloy formation in a Cu electroless plated Ni/YSZ anode-supported solid oxide fuel cell was investigated. Reduction of the Cu-Ni/YSZ cell in H2 allowed the diffusion of the Cu into the Ni and the formation of Cu-Ni alloy, as evidenced by XRF elemental analysis and characteristic di…
Effect of volatile boron species on the properties of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode materials has been studied in detail by using porous electrode coatings and dense bar samples. Prior to the characterization, the LSCF samples were heat-treated at 800oC in air in the presence of borosilicate glass for 7 and 30…
A mathematical model which was validated using button cells is used to predict the phosphine induced performance degradation in relatively large planar cells operating on hydrogen fuel. The empirical model parameters are calibrated using button cell experiments as guide. These parameters are then used to perform simul…
In SOFCs, a wide range of fuel gases can be applied, but fuel impurity tolerance may be desired. By applying gadolinia-doped ceria (GDC) anode material, we analyzed power generation characteristics and internal reforming followed by high-resolution electron microscopy in order to moderate sulfur poisoning. Effect of c…
In this paper, a preliminary control law, on the basis of the model-based analysis, is adopted to allow convenient integrations into a comprehensive power tracking control algorithm. The dynamic modeling methodology is employed to assess the dynamic responses of a SOFC stack under startup and load change conditions. T…