Mixed electrolyte 1 mol/L LiPF6/ N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl) imide(PP13TFSI) +ethylene carbonate(EC) +dimethylene carbonate(DMC) was prepared using ionic liquid PP13TFSI and organic solvent EC,DMC.The results of thermogravimetric(TG) analysis indicated that the adding of PP13TFSI restrained the volatilization of orga-nic solvent,as increased the volume content of PP13TFSI,at the same temperature,the weight loss of the mixed electrolyte was less.When the content of PP13TFSI was no less than 40%,the mixed electrolyte was nonflammable.When cycled with 0.05 C in 2.5～4.2 V,the initial specific discharge capacity of Li/LiNi0.7Co0.15Mn0.15O2 cell using 1 mol/L LiPF6/20%PP13TFSI+80%mixed electrolyte was 183.8 mAh/g,which was higher than the pure organic electrolyte one.

重点研究了热处理工艺对（LaNdPrMg）（NiCoAl）3.8合金相成分和电化学性能的影响。总结发现1323 K保温5 h急冷的热处理过程,在改善相成分方面,可以使合金中高容量的A5B19相丰度达到68%（质量分数）,电化学性能测试表明,其最大放电容量达到400.9 mAh.g-1,电化学循环100周容量保持率达到82.44%。经分析认为,加热保温过程对改善储氢合金相结构的均匀性起到一定的作用,而急冷过程对改善储氢合金综合性能起到至关重要的作用。

7-Ethyl camptothecin(2) was obtained by alkylation of camptothecin with propaldehyde in AcOH/98%H2SO4.Eleven novel 20(S)-O-linked substituted benzoic acid-7-ethyl camptothecin ester compounds(4a~4k) were synthesized by straightforward esterification of 2 with substituted-benzoic acid using 1-3-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride as the dehydrator and 4-dimethylamiopryidine as the catalyst.The structures were characterrized by 1H NMR,IR and MS.Antitumor activities of 4a~4k were investigated against five human cancer cell lines(LLC-E9FP,95D,BGC-803,HGC-27 and 7721) by MTT method in vitro.The results showed that 4b and 4e had significantly stronger antitumor activities against LLC-E9FP cell than that of camptothecin,and 4h~4k exhibited a certain antitumor activities against HGC-27,95D and 7721 cells.

This article makes use of polyurethane foam as matrix for the preparation of foamed Ni-Mo-Co alloy,by pretreatment,electrodeposition sinter-reducing and deoxidization.The surface morphology,element composition and microstructure of Ni and Ni-Mo-Co alloy were investigated by scanning electron microscope(SEM) and X-ray diffraction(XRD).The catalytic activity of the obtained alloy was studied in 30% KOH solution by potentiostatic polarization technique.The results show that the Ni-Mo-Co alloy has a three-dimension grid structure and shows high porosity.The over-potential for HER declines about 407 mV compared to foam Ni electrode at 100 mA/cm2,showing better catalytic activity for hydrogen evolution.

SiGe bulk alloys are prepared by mechanically alloying(MA),followed by a spark plasma sintering(SPS) method.The phase analysis and microstructure of milled powders and sintered bulks are investigated through X-ray diffraction and scan electron microscope.In addition,the room-temperature electrical properties of bulk alloys are studied.The results show that Si and Ge powders can be alloyed by MA completely;Calculation from the XRD spectra using the Scherer formula shows that the average grain size of powders by MA is less than 20 nm,and grain size were increased by a subsequent SPS.

Ternary Ni-Mo-Co alloy electrode was prepared by electrodeposition.The effects of deposition current density,and temperature and pH of electroplating solution were studied on the catalytic activity for hydrogen evolution reaction of the alloy electrode.The chemical composition and microstructure of the alloy electrode were investigated by EDS and XRD.Based on the polarization curves,the optimal technological conditions can be determined,including deposition current density 15 mA/cm2,temperature 25 ℃ and electroplating solution pH 10.Under the above conditions,the prepared alloy electrode is of amorphous structure,silver bright appearance,smooth and compact surface,and the chemical composition of 34.09% Ni,59.51% Mo and 6.40% Co.Meanwhile,its overpotential of hydrogen evolution in 30% KOH solution is 112 mV,that is 352 mV lower than that of Ni electrode,showing better catalytic activity for hydrogen evolution.

采用电沉积方法在Cu基体上制备出Ni-Mo-Co三元合金电极,主要研究了沉积电流对Ni-Mo-Co合金电极析氢催化活性的影响。采用扫描电子显微镜和X射线衍射技术分别研究了Ni-Mo-Co合金镀层的表面形貌、元素组成和晶体结构,采用稳态极化曲线和交流阻抗技术研究了Ni-Mo-Co合金电极在30%KOH溶液中的析氢催化性能。结果表明:电沉积Ni-Mo-Co合金外观呈银白色,表面光滑细致,为非晶态结构。合金电极的析氢催化性能随着沉积电流的增大表现为先升高后降低的趋势,当沉积电流密度为15 mA.cm-2时,获得合金镀层具有最低的析氢过电位η100=139 mV,显示出良好的析氢催化活性。其析氢反应为Volmer-Heyvosky反应机制,主要受电化学脱附步骤控制。

One-dimensional semiconductor materials Bi2Te3 nanotubes were synthesized via an ultrasonic-assisted hydrothermal method at 180°C for 48h. The products were characterized by XRD, SEM, EDS, TEM, and HRTEM. The results indicate the size of as-prepared Bi2Te3 nanotubes is about 500–1000nm in length and 50–100nm in diameter. Bi2Te3 nanotubes grow spirally along the (001) direction, whose angle with the tube axis is about 20°. The probable formation model of Bi2Te3 nanotubes is proposed based on the experimental results. The synthetic approach could be used to synthesize other one-dimensional nanomaterials.

The effects of heavy rare earth oxide additives on the high temperature performance of nickel electrodes were investigated. It is found that the 1 C charge acceptance ability of the spherical Ni(OH)(2) electrode with heavy rare earth oxide additive is improved; however, the heavy rare earth oxide as additive has negative effect on the high rate discharge performance at room temperature. The cyclic voltammetry (CV) results indicate that the heavy rare earth oxide as additive can increase the overpotential of oxygen evolution at high temperatures. The oxygen evolution reaction is effectively depressed and leads to the increase of charge efficiency of Ni(OH)(2) electrode at high temperatures. Moreover, the reversibility of Ni(OH)(2) electrode is also improved at high temperatures.

n-Type Si-Ge thermoelectric alloys were prepared using a melt spinning (MS) process, and then the microstructures of the samples were investigated. The alloys studied were ribbon shaped with a thickness of about 30 μm. Scanning electron microscopy (SEM) along with energy-dispersive spectrometry (EDS) and x-ray diffraction (XRD) showed a predictable, homogeneous, fine-grained microstructure at the high cooling rate, different from those of samples created by slow solidification (SS).

In this paper,the influences of different oxide additive(La2O3,Y2O3,CuO,and CoO) on low temperature and high-rate discharge performances for the negative electrode of Ni/MH battery and mechanism have been studied.Electrochemical measurements have been conducted to investigate capacity,charge-discharge performance,cyclic voltammetry and electrochemical impedance characteristics.The surface morphologies and compositions have been investigated by SEM and EDS.

研究了Nd元素部分取代对La0.8-xNdxMg0.2Ni3.3Co0.5(x=0～0.15)合金的相结构和电化学性能影响.研究发现,由X射线衍射图谱分析,合金主要由CaCu5型相、PuNi3型相及少量PrsCo19型相组成,随着Nd含量的增加,合金物相晶胞参数和晶胞体积在逐渐降低.合金电极电化学测试显示,随着Nd含量的增加,La0.8-xNdxMg0.2Ni3.3Co0.5(x=0～0.15)合金电极电化学容量从370.5mAh·g-1(x=0)增加到最大容量377.7mAh·g-1(x=0.05),然后下降369.2mAh·g-1(x=0.15);合金电极电化学容量经过100次循环的容量保持率S100从65.9%(x=0)增加到最大至72.8%(x=0.15);合金电极的高倍率性能HRD1200逐渐从83%(x=)增加到88%(x=0.15),动力学测试分析结果显示合金高倍率性能是由电催化活性和氢在合金体内的扩散两个过程控制共同控制的.综合考虑,Nd取代量为0.15时,合金电极电化学性能较好.

Effects of flaky rare earth oxide additives including Er2O3, Tm2O3, and Yb2O3, Lu2O3 on high temperature and high rate discharge performance of nickel electrodes were investigated. The discharge efficiency at 0.2C reached 96% at 60 °C for electrodes with 1 at.% flaky rare earth oxides. The high rate discharge performance for electrodes with flaky rare earth oxides were improved significantly, for example, discharge efficiency at 5C improved from 50% to 70%. The results showed that the end charging potential of the nickel electrodes with flaky rare earth oxides were higher than that without rare earth oxide additives, but lower than that with normal rare earth oxide additives. The CVs experimental results suggested that flaky rare earth oxides increased the oxygen evolution potential and improved the reversibility of nickel electrodes.

The effects of electroplating pH value to the La-Mg-Ni hydrogen storage electrode plated Ni on the surface were stu-died.The surface of the electrode was covered with Ni layer after electroplating.With the increasing of pH value,the alkali-resistant performance and cycle performance of the electrode were weakened first and then enhanced,the specific capacity was decreased first and then increased,the polarization resistance decreased and the exchange current increased.When pH=4,the specific discharge capacity of the electrode was 270 mAh/g after 40 cycles at 1 C,the capacity fading rate was 11%.When pH=5,the pola-rization resistance was smallest and the exchange current was biggest,the electrocatalyst activity on the surface of electrode was best,the hydrogen diffusion coefficient in alloy was 9.69×10-10 cm2/s and the kinetic performance of the electrode was best.

SiGe alloy composite material including TiN nanoparticle were prepared. The TiN nanoparticles as the inert scattering center were fabricated by Nitrogen plasma-metal reaction. The sintered samples were characterized by electrical resistivity and seebeck coefficient measurement. Adding nanophase inclusion into the SiGe alloy matrix, the Seebeck coefficient increased, the electrical conductivity decreased and the electrical power factor only slightly reduced.

CMC+PTFE,HPMC and HPMC+PTFE were used as binders and the effects of the binders on the positive electrodes properties of Ni-MH were investigated by the electrochemical measurement,SEM and EDS methods,individually.For the single added HPMC electrodes,the discharge capacity are increased,the high rate discharge and high temperature performance are improved compared to the binder with the composition of CMC+PTFE.With the increase of the HPMC concentration,the discharge capacity increases,and the addition concentration has little influence on the high rate charge-discharge performance.For the binder as a mixture of HPMC+ PTFE,all the sample have the higher discharge capacity,lower high rate and high temperature charge-discharge efficiencies as well as lower medium value voltage than those of the single addition of HPMC.It can be seen from SEM that a film is formed on the surface of positive electrodes and no nickel hydroxide powders detach from the surface after the charge-discharge test,which indicates that the addition of PTFE to the HPMC can greatly inhibit the nickel hydroxide powders pull-off from the surface of the electrodes,which can benefit to the service life of the Ni-MH battery.Finally,the conclusion was given that the sample using HPMC(0.4%)+PTFE(0.4%) as binder exhibited excellent electrochemical properties.

Proton exchange membrane fuel cells(PEMFC) possess normal characteristics(high efficiency of energy transformation,environmental friendship and so on) of fuel cells,as well as many prominent properties such as easy start-up at low temperature,long life,high specific power and energy,which have already become one of the hot research fields of the world.Bipolar plates are main parts of PEMFC,which have important influence on its volume,weight and battery properties.At present,material and flow field are main research fields upon bipolar plates all over the world,and material design is the keystone especially.In this paper,the research states on material at home and abroad and flow field of bipolar plates are described,the merits and defects of bipolar plates with different materials and flow fields are also analyzed,and the application and developing foregrounds are reviewed.

In this paper, the influences of different binders (Hydroxypropyl Methyl Cellulose (HPMC), Carboxymethyl Cellulose Sodium (CMC), Polytetrafluoroethylene (PTFE) and Styrene-butadiene Rubber (SBR)) on high-rate discharge performances at low temperature for the negative electrode of Ni/MH battery have been studied by orthogonal experimental design. Electrochemical measurements have been conducted to investigate the capacity, charge-discharge performance, cyclic voltammetry and electrochemical impedance characteristics. The surface morphology and chemical compositions have been investigated by SEM and EDS. Based on the range analysis, the primary and secondary influence factors as well as the optimization results were obtained. From the CV characteristic curves, the oxidization peaks and reduction peaks are not clearly shown, which indicates that the redox reaction does not occur clearly after binders added. The EIS experiments show that the deterioration of the voltage characteristic of the battery is due to drying out of the separator that increases the ohmic resistance (R-s), and the decay of the discharge capacity is due to the passivity surface that increases the charge-transfer resistance (R-t) of the battery.

In this experiment, electroless plating method was used to obtain the hollow nickel fibres. Polyacrylonitrile fibres with the diameter about 10μm and 3mm length were chosen as the templates of electroless-plating through screening and optimizing various fibres. Low temperature alkaline solution with the sodium hypophosphite as the reducer was adopted and the optimal parameters were determined. Polyacrylonitrile composite fibres with a dense nickel coating about 5~7 μm thickness were obtained. The plated fibres were then sintered in the air to remove the organic templates. It had been found that the sintering temperature had great influences on the formation of the hollow fibres. The Polyacrylonitrile fibres could not be removed completely at low temperature (300°C), and when the temperature increased to 400°C, no organic fibres could be observed from SEM and the hollow nickel oxide fibres with dense wall were obtained. However, when the sintering temperature further increased to 500°C, great changes had been found, the hollow fibres with brittle porous wall were obtained. A dense and uniform hollow nickel fibres with nickel content higher than 90% were finally obtained after the hydrogen reduction treatment at the temperature of 750°C for 2 hours.