Rutile-type Ti0.93Nb0.07O2 was characterized and evaluated as a potential interconnect material for low temperature solid oxide fuel cells. It was revealed that Ti0.93Nb0.07O2 shows the conductivity of ca. 50 S/cm in reducing atmospheres over a wide temperature range of 400∼1000°C. Also, the effect of Cr-doping on conductivity and the segregation of niobium on grain boundaries was investigated. It was found that Cr-doping to rutile-type Ti0.93Nb0.07O2 is effective in improving the initial conductivity and reducing the rate of conductivity degradation upon aging in air.
In the present study, the electrodeposition of Pd-Ni-P metallic glass films has been investigated. The composition of the electrodeposited Pd-Ni-P films were controlled by adjusting the current density from 0.2 A dm−2 to 2.5 A dm−2. The results of DSC analysis demonstrated that the electrodeposited Pd-Ni-P films were metallic glass. The composition of the electrodeposited Pd-Ni-P films at 2.5 A dm−2 was close to bulk metallic glass. The Tg and Tx of electrodeposited films were in good agreement with bulk metallic glass. The electrodeposition is able to fabricate the Pd-Ni-P metallic glass, which is close to bulk metallic glass.
Porous ceramic tubes consisting of La0.7Sr0.3Ti0.7Fe0.3O3 (LSTF) perovskite oxide was investigated in this study by using Filament-Winding (FW) method. When methacrylic acid with molecular weight of 50000 was used for organic binder, LSTF fiber with 0.5 mm in diameter and 15 m in length can be obtained by extrusion method. Although the mechanical strength of the obtained LSTF fiber was lower than that of the polymer fiber used for FW method, the obtained LSTF fiber showed reasonably large strength and expand ratio. As a result, LSTF porous tube can be obtained by FW method and calcination at 1673 K. Comparing with the porous tube prepared by a conventional sintering method, it was found that the obtained LSTF tube showed much larger porosity (ca. 80%) and large air permeation rate.
Surface structures of Pd(111) and Pd(100) electrodes have been determined at 0.50 V (RHE) in 0.1 M HClO4 saturated with Ar or O2 using surface X-ray scattering (SXS). Both surfaces have unreconstructed (1×1) in-plane structure. The surface layers on Pd(111) do not relax in Ar saturated solution: the interlayer spacing between the first and the second layers d12 agrees with that of the bulk. In O2 saturated solution, the value of d12 is expanded by 1.8% on Pd(111), whereas the value of d23 (interlayer spacing between the second and third layers) is the same as that of the bulk. No relaxation is also observed on Pd(100) in Ar saturated solution. In O2 saturated solution, however, d23 as well as d12 is expanded by 5.7% on Pd(100).