Materials Literature
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Abstract Octaphenylsilsesquioxane (PH‐POSS) and octa(γ‐methacryloxypropyl)silsesquioxane (MA‐POSS) were successfully synthesized by hydrolytic condensation of phenyltrichlorosilane and γ‐methacryloxypropyltrimethoxysilane, and characterized by Fourier transform infrared (FT‐IR), 1 H and 29 Si nuclear magnetic resonanc…
It is well-known that interfaces between various substances are widely used in modern electronics. Recently it has been found out that the interfaces of two dielectrics can possess unusual electronic properties. This work shows that high-conductivity interface can be obtained not only on the boundary of two crystals b…
SOFC (solid oxide fuel cell) are known for a high electrical efficiency and especially the ESC (electrolyte supported cells) for a good robustness for system operation. Nevertheless common system concepts that use CPOX (catalytic partial oxidation) or SR (steam reforming) as fuel processing still show disadvantages. C…
In this work we investigate the thermal conductivity of graphene-based antidot lattices. A third nearest-neighbor tight-binding model and a forth nearest-neighbor force constant model are employed to study the electronic and phononic band structures of graphene-based antidot lattices. Ballistic transport models are us…
Spectroscopic Ellipsometry (SE) was used to characterize the complex refractive index of Chemical Vapor Deposition (CVD) graphene grown on copper (Cu) foils and transferred to glass and SiO2/Silicon substrates. Previously, we reported the complex refractive index of single layer graphene on glass substrates. Here, we…
Graphene was synthesized on SiO2/Si wafers as large as 200 mm in diameter by thermal chemical vapor deposition (CVD) using Fe or Cu films as catalyst, and top-gated field-effect transistors (FETs) were fabricated directly on the wafer using a graphene-transfer-free process. For transistor fabrication, graphene was syn…
This study focuses on the investigation of the influence of solved nickel on the accelerated degradation of the ionic conductivity of 8YDZ (8.5 mol% Y2O3-doped zirconia) under reducing atmosphere. In comparison to pure 8YDZ, the degradation of Ni-containing 8YDZ proceeds 50 times faster and is completed after 100 h at…
In this study, <TEX>$(K_{0.5}Na_{0.5})(Nb_{0.97}Sb_{0.03})O_3+0.9$</TEX> mol% <TEX>$K_{5.4}Cu_{1.3}Ta_{10}O_{29}+x$</TEX> mol% <TEX>$K_4CuNb_8O_{23}$</TEX> (x = 0, 0.2, 0.6, 0.8) ceramics were prepared by a conventional mixed oxide method. Their microstructure and electric properties were investigated. The secondary p…
Abstract A novel route to immobilize metalloporphyrins on polymeric supports was put forward, and it is the way to synchronously synthesize and immobilize porphyrins on polymeric microspheres, followed by metal salt coordination reaction. Copolymeric microspheres (GMA/MMA) of glycidyl methacrylate (GMA) and methyl met…
Patterned Ni anodes are a common method to determine elementary kinetic reaction mechanism at the anode of Solid Oxide Fuel Cells. Their well defined Triple-Phase-Boundary (TPB) of electrode, electrolyte and gas phase, where the electrochemical oxidation takes place, is easily accessible. However, the direct transfer…
Since Direct Carbon Fuel Cell (DCFC) requires a molten electrolyte in order to facilitate ionic contact between solid carbon fuel and electrolyte, conductivity and stability studies concerning molten bismuth oxide (Bi2O3) has been thoroughly investigated. These studies reveal that Bi2O3 exhibits high ionic conductivit…
Freeze tape casting was used to fabricate a porous metal support for the solid oxide fuel cell (SOFC). The parameters that affect tape quality, such as casting temperature, solid loading, amount of additives and particle size of steel powders, have been investigated. It was found that that casting temperatures between…
Multilayered oxygen electrodes for High Temperature Steam Electrolysis (HTSE) based on nickelate oxides Ln 2 NiO 4+δ (Ln=La, Pr or Nd) as active material and gadolinium-doped ceria (CGO) as buffer layer have been characterized on symmetrical half-cells with yttria-stabilized zirconia (YSZ) as electrolyte. The polariza…
Abstract The mechanical behavior of polypropylene (PP) and 30 wt% coir fiber reinforced PP composites, with and without compatibilizer, were assessed through monotonic (tensile and bending) and cyclic (fatigue) tests. Fatigue load controlled tests were conducted under tension loads at a frequency of 6 Hz. The fracture…
New Energy and Industrial Technology Development Organization (NEDO) has started the development project of system and elemental technology on SOFC from Fy2008. The objective of this project is to clarify the prospects for 40,000 hours of operation (voltage decrease rate less than 0.25%/1,000 hours) and the prospects…
The JÜLICH SOFC group has assembled and tested more than 430 SOFC stacks rated between 100 W and 15 kW during the last 15 years. The main focal points of current development are the improvement of SOFC stack lifetime, increased performance, especially at relatively low temperatures (<700°C), increased robustness of…
Praseodymium doped cerium oxide (PCO) shows mixed ionic and electronic conducting (MIEC) characteristics at relatively high pO2 (e.g. air) and enhanced oxygen storage capacity (OSC), of interest for solid oxide fuel cell (SOFC) cathodes and three way catalysts, resulting from the ready reduction of Pr to its trivalent…
In this study the performance of anode supported solid oxide fuel cells (ASC) operated with biogas derived from corn silage (biogas) is analyzed. The fuel gas is produced by supercritical water gasification at the pilot plant VERENA operated at the Karlsruhe Institute of Technology. Current voltage characteristics sho…
We report first principles calculations of transport properties of the all-oxide La2/3Sr1/3MnO3/MgO/SrRuO3 magnetic tunnel junctions. A sizeable rectifying behavior which can be enhanced by increasing the MgO barrier thickness is predicted theoretically. For the device with 13 layers of MgO barrier, the positive curre…
Recently an empirical model was established to predict the photoelastic response of a glass based on its composition and the crystalline structure of its constituents. In the present work the model was tested in detail by comparing the local structure assessed by a combination of nuclear magnetic resonance and Mössbau…