聚苯醚阴离子膜的改性及在钒电池中的性能

阴离子交换膜具有优异的阻钒性能,但是其电化学性能和化学稳定性低于阳离子交换膜,阻碍了其在全钒氧化还原电池中的应用。选用国内商业化聚苯醚(PPO)阴离子膜作为基膜,采用了两种不同的方法在阴离子交换基膜中引入阳离子交换基团成为两性离子交换膜。结果表明,二种改性方法均能提高膜的IEC、电导率等基本性能和电化学性能。由于全氟磺酸溶液(PFSA)改性后隔膜的阻钒离子能力显著提高,该膜组装的电池的能量效率和电流效率分别提高3.2%和6.7%。     

美国组合式5.6mm运动步枪

美国组合式5.6mm运动步枪(又称组合式小口径运动步枪),使用美国5.6mm圆头弹,也可发射中国5.6mm运动步枪弹。 该枪特点是组装快捷、携带方便。全枪零件数为58件。如图1所示,枪托底盖打开,便可取出枪身、枪管、弹匣等组件,枪管与机匣采用键联结,枪管箍锁紧后装上枪托,     

稀土在汽车尾气三效净化催化剂中应用的研究

稀土元素以其特殊的电子结构和性能在汽车尾气三效净化催化剂（TWC）中获得了广泛应用,它在TWC中用作助催化剂,稳定剂,贵金属和载体的表面分散剂及钙钛矿稀土复合催化剂等。     

组合化学在无机功能材料中的研究进展

综述了近些年来,组合化学产业的历史背景、条件、基本方法、基本理论、以及在无机功能材料中的研究进展。     

PP/SEBS基导电复合材料的研制

以聚丙烯(PP)和(苯乙烯/乙烯/丁烯/苯乙烯)共聚物(SEBS)的共混物为基体材料,通过掺杂炭黑和碳纤 维,用开炼法制备了一种高电导率的导电复合材料,其体积电阻率小于0.1Ω·cm,并作为集流体材料应用于全钒氧 化还原液流电池。     

用氧化锌矿制备纳米级氧化锌

报道了从氧化锌矿制备的米级氧化锌的优惠工艺条件，并对所制得的氧化锌产物进行了Ｘ射线衍射分析，证明所得产品为高纯钠米级氧化锌粉。     

功能高聚物聚苯胺及其应用研究进展

介绍了聚苯胺的性能和９０年代以来其在功能材料方面应用的进展。     

Electrochemical behavior of diverse vanadium ions at modified graphite felt electrode in sulphuric solution

PAN-based graphite felt (PGF) treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electrodes of vanadium redox battery (VRB). Structure and characteristic of treated PAN-based graphite felt (TPGF) were determined by means of Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Brunauer-Emmett-Teller surface area analysis and VRB test system. The results show that the acid and heat synergistic effect increase the number of —COOH functional groups on the PGF surface, and the PGF is eroded by sulphuric acid oxidation, resulting in the surface area increases from 0.31 m2/g to 0.45 m2/g. The V(Ⅱ)/V(Ⅲ) redox reaction is electrochemically reversible on the TPGF electrode, while the V(Ⅳ)/V(Ⅴ) couple is a quasi reversible process. The diffusion coefficients of the oxidation for V(Ⅳ)/V(Ⅴ) obtained from the scope of peak current Ip vs scan rate v1/2 is 4.4×10-5 cm2/s. The improvement of electrochemical activity for the electrode is mainly ascribed to the increase of the number of —COOH groups on the TPGF, which behaves as active sites catalyzing the vanadium species reactions and accelerating electron transfer reaction and oxygen transfer.     

Syntheses and cofluorescence of complexes of Eu（Ⅲ）/Y（Ⅲ） with terephthalic acid, 2-thenoyltrifluoroacetone and trioctylphosphine oxide

A series of Eu（ Ⅲ）/Y（Ⅲ） complexes of terephthalic acid（TPA） with 2-thenoyltrifluoroacetone（HTTA） and trioctylphosphine oxide（TPPO） were synthesized. Compositions of these complexes are revealed to be Eu2（1-x）Y2x（TPA）（TTA）4- （TPPO）4 or EU1-xYx（TPA）（TTA）（TPPO）2. Their 1R spectra, fluorescent spectra and the thermal and optical stability were studied. The fluorescent excitation spectra of these complexes show more broad excitation bands than those of Eu2（TPA）3（TPPO）4 and Eu（TTA）3（TPPO）2 corresponding to their formations. In addition, both the binuclear complex EuY（TPA）（TTA）4（TPPO）4 and the chain complex EU0.4Y0.6（TPA）（TTA）（TPPO）2 present higher thermal stability and better optical stability than the mononuclear complex Eu（TTA）3（TPPO）2 does. And their thermal and optical stabilities are preferably interpreted from the binuclear structure together with the chain polynuclear structure of the complexes. The fluorescence enhancement of cofluorescence Y^3＋ ions to the Eu（Ⅲ） complexes is clear. The optimum content of Y^3＋ is 0.6 （molar fraction） for the chain complexes Eu1-xYx（TPA）（TTA）- （TPPO）2 and 0.5 for the binuclear complexes Eu^2（1-x）Y2x（TPA）（TTA）4（TPPO）4. The formation of polynuclear structure of the complex Eu1-xYx（TPA）（TTA）（TPPO）2 appears to be responsible for the good cofluorescence effect of Y^3＋ ions.     

Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension

A series of catalysts of nanometer TiO2 were prepared by silver depositing. The photocatalytic degradation of dimethomorph in an aqueous suspensions by silver depositing with nanometer titanium dioxide as catalyst was investigated by radiation of UV-light and sunlight. A pseudo-first-order kinetic model was used to describe the results. The effects of the dosage of catalyst, oxidant, pH and radiation source on degradation were examined. The experimental results show that the decomposed rate of DMM is 94% when the dosage of catalyst is 1.25 g/L and the concentration of DMM is 100 mg/L under the conditions of solution pH of 7, the air flow of 1.5 L/min and shining for 5 h by UV-light. When it is shined by sun-light under the same condition, the decomposed rate of DMM is 48 %.The mechanism of decomposition was discussed based on the data by analysis of LC-MS.