Double perovskite oxide Sr1.85MgMoO6-δ was synthesized by sol⁃gel method in 5% H2/Ar, and its structural stability was characterized by XRD. The experimental results show that the structure and phase composition of Sr1.85MgMoO6-δ have not changed after high temperature oxidation treatment, which fully proves its structural stability. The conductivity, thermogravimetric and electrochemical impedance spectra of Sr1.85MgMoO6-δ and Sr2MgMoO6-δ were measured in the same environment. The experimental results show that Sr vacancy can effectively enhance the conductivity of the material itself and increase the oxygen vacancy of the material. In addition, the polarization impedance value Sr1.85MgMoO6-δ (2.26~0.56 Ω·cm2) in H2 is smaller than that in Sr2MgMoO6-δ (4.80~1.96 Ω·cm2) at 700~800 oC temperature. Therefore, Sr1.85MgMoO6-δ double perovskite material is a very promising medium temperature solid oxide fuel cell (SOFC) anode material.

Solid oxide fuel cells (SOFC) can convert the chemical energy of the fuel directly into electricity with high efficiency, low population and wide fuel applicability. Nibased ceramic material was used as the traditional SOFC anode. This anode shows carbon deposition and sulfur poisoning when natural gas was used as fuel for SOFC. Therefore, development of novel SOFC anode materials with good resistance to carbon deposition and sulfur poisoning has attracted considerable interest. This article reviews the recent developments of anode in SOFC with principal emphasis on the material aspects. In addition, the developments of carbon tolerant SOFC anode materials were presented from their properties. The emphasis will be placed on the development of perovskitetype anode material researches. Finally, this review will be concluded with its perspectives on the future research directions of this area.

Mine hydraulic system fault diagnosis with a variety of forms can only rely on the experience and knowledge, and this restricts the application of the hydraulic system in mine equipments to a large extent. The simulation experiments were made and a new measuring and diagnosis method was proposed aiming at the phenomenon of appearing the cavitation in hydraulic system. Through the wavelet transform of the static random signal, it was found during the experimental and theoretical analysis that the process of using wavelet transform could accurately diagnose the cavitation appearing and cavitation occurs in hydraulic system of the moment, and it was a bigger help for the fault diagnosis of hydraulic system of the form by the cavitation of the oil pipe. The experimental results show that the method of hydraulic system fault diagnosis was feasible with the wavelet transform to the electrostatic signal, and the judgment was correct in about 95%.

B a _{0. 6} S r _{0. 4} Co _{0. 9} N b _{0. 1} O _3 --δ (BSCN) perovskitetype oxide was prepared by the solid state reaction. The high temperature chemical compatibility between BSCN0.6 and G d _{0. 1} C e _{0. 9} O _{1. 9 -5}(GDC) were analyzed by XRD. XRD patterns indicate that a week solid solution between BSCN0.6 and GDC takes place after the BSCN0.6GDC composite material was calcined at high temperature. However, this solid solution does not show a negative effect on the performance of the cathode. The mixture of BSCN0.6 and GDC in a weight ratio of 70∶30 was used as SOFC composite cathode and the electrical property, thermal expansion behavior and electrochemical performance were investigated. The electrical conductivity was found to decrease with increasing GDC content|however, the thermal expansion coefficients (TEC) of BSCN0.630%GDC composite cathode decreased, which enhances the thermal match between the cathode and GDC electrolyte. With BSCN0.630%GDC as the electrode, the polarization resistance of a symmetrical cell BSCN0.630%GDC//GDC is only 0.047～0.012 Ω•cm2 in 700～800 ℃. Therefore, BSCN0.630%GDC composite material is a promising ITSOFC cathode.

Perovskitetype oxide Ba0.6Sr0.4Co0.9Nb0.1O3δ (BSCN) was synthesized by the solid state reaction and investigated as a cathode for intermediatetemperature solidoxide fuel cells (ITSOFCs). XRD pattern indicated that BSCN crystallized in a singlephase perovskite with a cubic perovskite structure (Pm3m) and no evident reaction happened after the mixture of BSCN cathode and GDC electrolyte was sintered at 1 000 ℃ for 10 h. During the operating temperature of SOFCs (600~800 ℃), the electrical conductivity of BSCN reaches 21~27 S/cm. The thermal expansion coefficient value of 17.0 × 10-6/K has been measured for BSCN sample, which is much lower than that of SrCo0.9Nb0.1O3δ(SCN). This result indicated that Ba doping in SCN has a better thermal match to GDC electrolyte. Symmetrical cell with the configuration of BSCN/GDC/BSCN was used for the impedance measurements. The polarization resistance of BSCN cathode on GDC electrolyte is 0.026 Ω·cm2 at 750 ℃. With BSCN cathode, NiOCe0.8Sm0.2O1.9 anode and 300 μm thick GDC electrolyte, the maximum power density of single cell achieved 782 mW/cm2 at 800 ℃. All these results indicate that the BSCN oxide is a promising cathode candidate material for ITSOFCs.