Advanced Materials Research Vols. 986-987

Abstract: Transmission spectrum and reflectance spectrum have long been used to characterize gap semiconductor. Transmission spectrum can be measured very directly, but the influence of substrate absorption is often unavoidable. However, when using the reflectance spectrum measurement, the absorption of thin film, substrate absorption, and coherent interference will make the reflectance spectrum much more complicated. In this paper, Considering the absorption of thin film, substrate absorption, and coherent interference, we use the envelope curves algorithm to achieve the calculation formula of refractive index deduced from the reflectance spectrum. Through the analysis of the reflectance spectrum of Ga₂O₃ film, we achieved thickness of the film, refractive index, extinction and absorption coefficient and dispersion constant.

Abstract: ZnS thin films were deposited at three different radios of V(NH₃·H₂O)/V(N₂H₄) on glass substrates by chemical bath deposition (CBD) method without stirring the deposition bath during the deposition process. The structural and optical properties were analyzed by X-ray diffraction (XRD) and UV-VIS spectrophotometer. The results showed that ZnS thin film deposited at the radio of V(NH₃·H₂O)/V(N₂H₄)=15:15 is higher than that of the other two different solutions. With the radio of V(NH₃·H₂O)/V(N₂H₄) decreasing from 15:5 to 15:15, homogenous precipitation of Zn (OH)₂ easily forms in the bath, but ZnS precipitation first become suppressed and then easily forms in solution. It means that the concentration of OH^- ion increases with the volume of N₂H₄ increasing, which accelerates the formation of Zn (OH)₂. However, when the volume of N₂H₄ increases to 15mL, relatively high concentration of OH^- ion not only accelerates the formation of Zn (OH)₂, but also be used to the hydrolysis of thiourea. The average transmissions of all the ZnS films from three different solutions (V(NH₃·H₂O)/V(N₂H₄)=15:5, 15:10 and 15:15) are greater than 90% for wavelength values in visible region. The direct band gaps range from 3.80 to 4.0eV. The ZnS film deposited for 2.5h with the radio of V(NH₃·H₂O)/V(N₂H₄)=15:15 has the cubic structure only after single deposition.

Abstract: FePO₄·2H₂O nanoplates are synthesized by a hydrothermal method, using Fe (III) compound as the iron source and are lithiated to LiFePO₄/C by a simple rheological phase mathod. The structure, morphology and electrochemical properties of the FePO₄·2H₂O nanoplates and LiFePO₄/C composites synthesized by changing the concentration of the reactants were characterized in detail by X-ray (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscope and electrochemical measurement. The LiFePO₄/C nanoparticles lithiated from the FePO₄·2H₂O nanoplates when there were about 10 mmol Fe³⁺ in 20 ml water solution demonstrates excellent cyclic performance.

Abstract: Along with our country " west-east electricity transmission " project and UHV projects,HTV-silicon rubber has been more and more widely used in the western regions of China,such as xining, Lhasa, hami and other regions, has strong solar radiation, long sunshine time, but the region environment humidity conditions are different. Therefore, it is necessary to study the Effect of UV Radiation on HTV-Silicon Rubber under different humidity. In this paper, the extraction of relative humidity variable, under different humidity conditions,HTV silicone rubber material taken for artificial ultraviolet aging experiment, to explore under different humidity conditions,HTV silicone rubber material’s ultraviolet aging properties. Experimental samples of artificial ultraviolet aging experiment taken in static contact angle test, hardness test, fourier transform infrared spectroscopy (FTIR) analysis, then integrate the test data and make theoretical analysis.The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH₃ and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH₃ and Si-O-Si keys is interrupted into free radicals; UV radiation has a certain influnce on HTV silicone rubber.Humidity variable has two contray sides influence on ultraviolet aging characteristics of HTV silicone rubber material,its process is complicated.

Abstract: In this paper the different proportional Pt/Ag on XC-72 carbon are studied to serve as the electro-catalysts of H₂O₂ in acid media. All catalysts are prepared by impregnation reduction method and characterized by XRD and TEM. The electrochemical performance tests are examined by cyclic voltammetry (CV) at 25°C and 30°C, respectively. The results suggest that the peak current density increases with increasing the Ag content in Pt-Ag/C. Attributed to the temperature factor, the electro-catalytic activity of all catalysts at 30°C is better than that of 25°C.

Abstract: Since transparent conducting oxides can be as a buttom layer of complex film electrodes, electrodeposition technique may produce ZnO films depending on variety conditions and modified surface layers of substrates in electrochemical procedures. Here we invested the structure and morphologies of ZnO films by using modified surface of the substrate-ZnO/ITO/polymer-PEN and ZnO doped Ga/ ITO/polymer-PEN.

Abstract: To study migration and transformation of sulfur species in oxyfuel combustion, the study attempts to analyze distribution of sulfur compounds with thermodynamic equilibrium. Results show that sulfur-containing gases predominantly are SO₂ and SO₃, the maximum thermodynamic equilibrium concentration of those in oxyfuel combustion respectively increase by 3.4 and 4.5 times compared with the conventional combustion. Furthermore, SO₂ gas formation rate decreases while SO₃ increases under oxyfuel combustion. Sulfur-containing gases are generally more sensitive to temperature and excess air coefficient. The amount of sulfur compounds significantly increases in oxyfuel combustion.

Abstract: Reaction activities of Ni-doped and Cu-doped Fe₂O₃ oxygen carriers (OCs) with CO were investigated using thermo gravimetric (TG-DTG).The structures of the prepared OC were characterized by X-ray diffract meter (XRD).TG-DTG investigations indicated that rational Ni and Cu doping could efficiently enhance the reactivity of Fe-base oxygen carrier for oxidizing CO under different conditions. And Fe-based OC doped with 20 wt. % Ni can realize the highest reactivity.

Abstract: Now steam stimulation gradually become one of the major thermal recovery methods, and hydrogen sulfide appears in the well casing. With the increase of the thermal recovery time and the application of SAGD technology, the number of wells containing hydrogen sulfide increased, and concentration of hydrogen sulfide are also rising,Producing corrosion products - ferrous sulfide. Ferrous sulfide has pyrophoric. When ferrous sulfide in contact with oxygen in the air can cause spontaneous combustion at room temperature. In order to avoid the occurrence of spontaneous combustion of ferrous sulfide we had an in-depth study of the spontaneous combustion of ferrous sulfide. Through laboratory tests we found the following points. At room temperature,sulfurization reaction of H₂S gas and iron oxides occurs more easily in a dry environment. Temperature, H₂S humidity, various iron oxides,have important effects on the generation of iron sulfide.

Abstract: N-methyl-N-allylpyrrolidinium bis (trifluoromethanesulfonyl) imide (PYR_1ATFSI) with substantial supercooling behavior is synthesized to develop low temperature electrolyte for lithium-ion batteries. Additive fluoroethylene carbonate (FEC) in LiTFSI/PYR_1ATFSI/EC/PC/EMC is found that it can reduce the freezing point. LiFePO₄/Li coin cells with the FEC-PYR_1ATFSI electrolyte exhibit good capacity retention, reversible cycling behavior at low temperatures. The good performance can be attributed to the decrease in the freezing point and the polarization of the composite electrolyte.