Materials Literature
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Electrochemical Performance and Stability of the Cathode for Solid Oxide Fuel Cells: I. Cross Validation of Polarization Measurements by Impedance Spectroscopy and Current-Potential Sweep, Zhou, X.-D., Pederson, L. R., Templeton, J. W., Stevenson, J. W.
The atomic and electronic structures of crystalline and amorphous ${\text{B}}_{4}\text{C}$ were determined within density function theory using the local density approximation and a plane-wave pseudopotential method. For the crystalline phases, chain, and polar structures were considered. The structural parameters wer…
A polymer based on tetrathionaphthalene (TTN) as a redox active molecular unit is presented. The sulfur-linked TTN polymer, in which TTN segments are covalently linked via thioether, exhibits reversible multiple redox responses and provides an observed capacity of at least 122 mAh g − 1 in an ethylene carbonate:diethy…
The electrical characteristics and residual stresses in three types of Ga-doped ZnO (GZO) films formed using a reactive plasma deposition system (type 1 film) and a magnetron sputtering system utilizing dc power (type 2 film) or (rf) power (type 3 film) were compared from the viewpoint of heat resistance as a function…
The stress corrosion cracking (SCC) behavior of X-65 carbon steel was investigated in simulated fuel-grade ethanol (SFGE) using the slow strain rate test method, potentiodynamic polarization, electrochemical impedance spectroscopy, open-circuit potential, and potentiostatic current monitoring. Results indicate that cr…
This study reports the physical properties and electrochemical behavior of (LBC), a perovskite material and a potential candidate for the solid oxide fuel cell (SOFC) cathode. LBC was synthesized by a solid-state route, and phase purity was checked by X-ray diffraction measurement. Thermogravimetric analysis of LBC wa…
Thermally labile dendronized AA−BB step polymers are described. First through third generation dendritic bisfuran monomers 6a − 6c were prepared in part by the Cu(I)-catalyzed azide−alkyne Huisgen 1,3-dipolar cycloaddition reaction and in turn polymerized by the reversible furan−maleimide Diels−Alder reaction. The Die…
Nanocrystalline -doped phosphors were prepared through a Pechini-type sol–gel process. X-ray diffraction (XRD), field-emission-scanning electron microscopy (FESEM), photoluminescence, cathodoluminescence (CL) spectra, and lifetimes were utilized to characterize the synthesized phosphors. The XRD results revealed that…
Three new peptide based dendrimers with different generations were synthesized, purified, and characterized. Each of these dendrimers form efficient organogels under suitable conditions and these gels were characterized by field emission scanning electron microscopy (FE-SEM), high resolution transmission electron micr…
The electrical properties of atomic layer deposition (ALD) nitrogen-doped ZnO (ZnO:N) thin films were investigated as a function of incorporated nitrogen concentration. The nitrogen concentrations in the films were controlled by using different concentrations of solution, which was used as a single source for the reac…
Reaction mechanisms in the atomic layer deposition (ALD) of Sb 2 Te 3 from SbCl 3 and (Et 3 Si) 2 Te at 60 °C and GeTe from GeCl 2 ·C 4 H 8 O 2 (1,4-dioxane complex of GeCl 2 ) and (Et 3 Si) 2 Te at 90 °C were studied in situ with a quadrupole mass spectrometer (QMS) and a quartz crystal microbalance (QCM). Also some…
The phase stabilities of ${\text{Y}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$ and ${\text{Y}}_{2}{\text{Zr}}_{2}{\text{O}}_{7}$ under high pressure were investigated by ab initio methods. Pyrochlore-structured ${\text{Y}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$ and defect-fluorite ${\text{Y}}_{2}{\text{Zr}}_{2}{\text{O}}_{7}$ exhi…
The oxygen nonstoichiometry ( δ ) of Ce 0.8 Pr x Tb 0.2 − x O 2 − δ ( x = 0 , 0.05 , 0.10 , 0.15 , 0.20 ) was measured as a function of P O 2 at temperatures between 600 and 900 ° C by coulometric titration and thermogravimetry. A nonideal solution model, allowing for a linear δ dependence of the partial molar enthalp…
We demonstrate the first bismuth-doped fibre amplifier operating in the second transmission window of silica-based fibres. At a pump power of 460 mW and pump wavelength of 1230 nm, its gain reaches 24.5 dB at 1320 nm, with a gain bandwidth of 37 nm, saturation power near 10 mW, and noise figure of 5 dB.
Hexavalent chromium species like the oxyhydroxide, , or hexoxide, , are electrochemically reduced to in solid oxide fuel cells and adversely affect the cell operating potentials. Using a narrowly focused beam from the Advanced Photon Source, such chromium oxide deposits were unequivocally identified in the active regi…
Peptide nanotubes with filled and empty pores and close-packed structures are formed in closely related pentapeptides. Enantiomorphic sequences, Boc-(D)Pro-Aib-Xxx-Aib-Val-OMe (Xxx = Leu, 1; Val, 2; Ala, 3; Phe, 4) and Boc-Pro-Aib-(D)Xxx-Aib-(D)Val-OMe ((D)Xxx = (D)Leu, 5; (D)Val, 6; (D)Ala, 7; (D)Phe, 8), yield molec…
We report the fabrication of a lateral ZnO nanowire UV photodetector on a glass substrate using tungsten as the growth barrier to suppress the vertical growth of the ZnO nanowires. Upon UV illumination, the detector current increased by more than 1 order of magnitude. Furthermore, the noise equivalent power and the no…
Metal oxide nanoparticles decorated with carbon nanotubes can be turned into readily recovered catalysts that function at the interface between oil and water phases.
The surface chemistry of two corrosion inhibitors, 1-hydroxybenzotriazole (BTAOH) and benzotriazole (BTAH), adsorbed on copper from 3% NaCl aqueous solution, was investigated by X-ray photoelectron spectroscopy (XPS). Surface and subsurface chemical structure, composition, and layer thickness were obtained from angle-…
The biosynthesis of histidine in Escherichia coli and Salmonella typhimurium has been an important model system for the study of relationships between the flow of intermediates through a biosynthetic pathway and the control of the genes encoding the enzymes that catalyze the steps in a pathway. This article provides a…