Materials Literature
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A thermal analysis of the anode, cathode and electrolyte of a practical solid oxide fuel cell (SOFC) is performed. Electrochemical impedance spectroscopy with two-electrode set-up is employed on an anode-supported micro tubular SOFC. This cell is an intermediate temperature SOFC composed of an Ni/(ZrO2)0.9(Y2O3)0.1 ce…
In this present paper, a comprehensive trio approach has been proposed to aid in the optimisation of the pre-reforming process, and to develop a new pre-reformer design. Measurements, design of experiments (DOE), and computational fluid dynamics (CFD) have been employed to determine the effects of several design and m…
Glasses from the system MO (M=Mg, Ca)-Al2O3-BaO-SiO2-B2O3 were developed and evaluated as SOFC sealants. The glasses presented in this study are analysed by dilatometry, differential thermal analysis (DTA), hot-stage microscopy and high temperature x-ray diffraction. Microanalysis of the glass to metal interfaces is d…
Chemical surface exchange coefficients k_chem and chemical diffusion coefficients D_chem of Nd2NiO4+δ have been determined by the conductivity relaxation technique at 575{less than or equal to}T/{degree sign}C{less than or equal to}725 between oxygen partial pressures of 0.01 and 0.02 bar. At 700 {degree sign}C values…
Metal-supported SOFCs are very attractive due to their high mechanical strength, thermal conductivity, and low material cost. These properties make SOFCs suitable for mobile application as well as the traditional stationary application. Contrary to many researches, using the thin-metal support will be more suitable fo…
Abstract Melting reactions of Cu, CuCl, Q ( Q = S, Se), and Bi 2 Q 3 yield black, shiny needles of the chalcogenide chlorides Cu 9 Bi 9 S 16 Cl 8 or Cu 7.4 Bi 6 Se 12 Cl 7 . The compounds decompose peritectically above 612(5) K and 623(5) K. Raman spectra reveal the presence of dichalcogenide groups, whereas for coppe…
Effectiveness of dilute HF based formulations in selectively removing copper oxide (CuOX) films with respect to copper and dielectric films has been investigated. Key solution variables studied include HF concentration, dissolved oxygen level and pH. Improved CuOX/Cu selectivity has been achieved under deaerated condi…
Nanoperforated ZrO2membranes, produced via organic/inorganic self-assembly using block copolymer micelles, serve as template for a Co/Pt multilayer stack with out-of-plane magnetic anisotropy. The deposition of the magnetic film results in an array of magnetic nanodots surrounded by a continuous magnetic film. These m…
The analytical partial capacitance methods (PCM) widely accepted for calculation of properties of capacitors with planar electrodes, coplanar strip waveguides (CPS) and coplanar waveguides (CPW) are reviewed based on the challenges met during the development and tailoring of (Ba, Sr)TiO 3 thin films fabricated on diff…
The crystal structure of the single-component molecular metal [Au(tmdt)(2)] was examined by performing powder X-ray diffraction experiments in the temperature range of 9-300 K using a synchrotron radiation source installed at SPring-8. The structural anomalies associated with antiferromagnetic transition were observed…
This paper reports the chemical degradation of Ni-based SOFC anodes caused by small amounts of impurities supplied with fuels. In particular, the impurity dependence of degradation behaviors as well as poisoning mechanisms are highlighted and investigated. Poisoning effects by chlorine and siloxanes are found to be cr…
Carbon doped TiO2nanocrystal powder samples with various C contents were synthesized by a low-temperature sol-gel method, and a large lattice C contents of 12.7% was obtained. We demonstrated that the C ions were homogenously doped into the TiO2matrix at the form of substitutional C (Cs-o) and interstitial C (CI), wit…
Controlling the growth orientation of semiconductor nanowire arrays is of vital importance for their applications in the fields of nanodevices. In the present work, hexagonal CdSe nanowire arrays with various preferential growth orientations have been successfully yielded by employing the electrodeposition technique u…
Performance of solid oxide fuel cell (SOFC) with nickel/zirconia anodes on synthetic coal gas in the presence of low levels of phosphorus, arsenic, selenium, sulfur, hydrogen chloride, and antimony impurities were evaluated. The presence of phosphorus and arsenic led to the slow and irreversible SOFC degradation due t…
We have used a co-extrusion / phase inversion process, followed by co-sintering and then NiO reduction with hydrogen, to fabricate anode (Ni-CGO) / cerium-gadolinium oxide electrolyte (CGO) dual-layer hollow fibers (HFs) with inner diameters < 1 mm. This is the first time such dual-layer fibers have been produced a…
Several alkylsilyl compounds of selenium and tellurium were synthesized and characterized. Crystal structures of (tBuMe2Si)2Se and (tBuMe2Si)2Te were solved. Thermal properties of the compounds were studied with TGA. It was found that these compounds are very volatile and thermally stable therefore suitable ALD precur…
Chromium poisoning of solid oxide fuel cell cathodes is up to now considered as one major factor which limits life-time and is responsible for degradation. Still unclear are to which extend chromium poisoning is responsible and what the basic degradation mechanism is. At Forschungszentrum Jülich this ambiguity should…
Chromium poisoning of solid oxide fuel cell cathodes is up to now considered to be a major factor which limits life-time and is responsible for degradation. Still unclear is to which extend chromium poisoning is responsible for degradation and what the basic degradation mechanism is. The Forschungszentrum Jülich tries…
Increasing complexity in bottom-up molecular designs of amorphous structures with multiple relaxation modes demands an integrated and cognitive design approach, where chemical synthesis is guided by both analytical tools and theoretical simulations. In particular, this is apparent for novel organic second-order nonlin…
Ibuprofen (an anti-inflammatory drug) has been loaded onto two different surfactant-templated silicas (SBA-15 and MCM-48). To evaluate the effect of the drug-solvent combination on the loading capacity of the silica, we have performed ibuprofen adsorption experiments using 10 different solvents; we have interpreted ou…