多孔氧化铝模板中交流沉积钴纳米线阵列

利用二次阳极氧化法制备了多孔氧化铝模板(PAM).用交流电化学沉积方法成功地在模板孔道内制备了Co纳米线.采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)对Co纳米线的形貌、晶体结构进行了研究.结果表明,模板的孔径均匀,孔道平直.Co纳米线均匀分布在PAM纳米孔隙中,直径与PAM孔径一致,约50 nm,并沿Co(111)晶面择优生长.     

Pt-Sn电极对有机小分子的电催化氧化

采用循环伏安法、电位阶跃法等实验方法用Pt-Sn电极对有机小分子的电催化活性进行了测定 ,找出影响其电催化活性的因素 .     

铁纳米线阵列的制备及磁性研究

采用二次阳极氧化法制备高度有序的多孔氧化铝模板,以高度有序的阳极氧化铝为模板,用交流电沉积的方法以较低的电压在孔洞中组装了铁纳米线有序阵列.采用场发射扫描电镜(FESEM)对模板和纳米线的形貌和结构进行了表征,采用物理特性测量系统(PMMA)测量了铁纳米线的磁滞回线,结果表明纳米线是均匀连续的,直径为50 nm左右,纳米线在平行于纳米线轴的方向的矫顽力为2 259 Oe,矩形比为0.92,铁纳米线阵列有高的磁各向异性,适用于垂直磁记录介质.     

电催化氧化技术中高效催化电极的研究进展

介绍了电催化氧化处理废水技术及该处理技术的核心--电极材料,针对电催化氧化技术存在的问题,综合阐述了目前国内外学者在DSA电极开发和改进方面的研究成果,并指出未来电催化氧化技术和电极材料研究的主要方向和发展趋势.     

电化学模板法制备金属Ni纳米线阵列的研究

采用电化学模板法在恒电位（-0.8V）下沉积10h成功制备了磁性金属Ni纳米线及其阵列结构。利用SEM、TEM、XRD对其微观形貌和晶体结构进行了表征,结果表明,纳米线阵列规整,排列紧密,纳米线长48μm,直径300nm,长径比160,阵列刚性较大,没有发生倒伏;制得的Ni纳米线具有多晶的面心立方结构,晶面指数为（111）,（220）,（200）。通过控制电沉积的时间,制备出不同长度的Ni纳米线,分析了电沉积时间对纳米线长度的影响。     

CoFe2O4纳米线阵列的制备与性能表征

采用Sol-gel法在孔径分别为50nm和200nm的AAO模板中制备高度有序的CoFe2O4纳米线阵列。用SEM、TEM和HRTEM对纳米线阵列的形貌和结构进行了表征。对钴铁氧体纳米线阵列进行磁性能研究，结果表明，CoFe2O4纳米线阵列没有择优取向性，但直径为50nm的钴铁氧体纳米线阵列的矫顽力大于直径为200nm的钴铁氧体纳米线的矫顽力，这是由于AAO模板的纳米孔道对材料的限域效应引起的。     

阳极氧化工艺对氧化铝模板孔径的影响

为了能制备出有序的纳米线阵列，采用一次阳极氧化的方法，制备出了孔径在12．8～43．5nm之间的多孔有序的氧化铝模板．通过改变氧化液浓度、氧化电压、氧化温度等条件，可对氧化铝模板的孔径大小进行控制，对各阳极氧化工艺因数对模板孔径的影响机理也进行了分析讨论．结果表明，在较低的氧化液浓度，氧化电压和氧化温度条件下，氧化铝膜的孔径较小；而在高的氧化液浓度，氧化电压和氧化温度条件下，氧化铝膜的孔径较大．     

CuO/AC粒子电极的制备及其电催化性能

以活性炭为载体,通过浸渍法制备了CuO/AC粒子电极,采用XRD、SEM、EDS等方法对粒子电极的理化性能进行了表征,并通过荧光测定粒子电极对于羟基自由基的生成能力。结果表明,CuO负载于粉末状活性炭表面,提供了更多的电化学活性位点;CuO的引入,增强了粒子电极的羟基自由基生成能力。考察了CuO/AC粒子电极电催化氧化处理活性艳蓝KN-R模拟废水脱色性能。CuO/AC粒子电极对目标污染物活性艳蓝有着良好的电催化氧化性能。在反应时间为1 h时,CuO/AC粒子电极的脱色率(87.2%)比AC粒子电极(64.6%)提高了22.6%,且可多次循环利用。     

多晶铂电极电催化氧化苯酚的电化学过程

采用循环伏安(CV)、Tafel曲线、交流阻抗(EIS)等方法研究苯酚在多晶铂电极上的电氧化过程.在扫描速度分别为10 mV/s、20 mV/s、50 mV/s、100 mV/s和200 mV/s时,以0.25 mol/L的Na2SO4为支持电解质,考查500 mg/L苯酚在铂电极上氧化的CV曲线变化规律.测试表明发生了不可逆的电氧化反应,氧化峰位置为0.926 V(vs.Ag/AgC l,扫描速度50 mV/s,).苯酚氧化峰电流值与CV扫描速率的关系表明苯酚的氧化反应是由扩散过程和吸附过程共同控制的电化学氧化过程.分别选用0.1和1.0 mol/L的H2SO4溶液为电解液,测试Pt电极析氧反应的Tafel曲线,Tafel斜率为149 mV.采用EIS分析苯酚的电氧化反应,结果表明在高频段存在苯酚吸附的特征容抗弧.     

CoPt合金纳米有序阵列的制备及磁学特性

采用电化学沉积法,在氧化铝模板中制备了φ50 nm的CoPt合金纳米线的高度有序阵列.纳米线结构和磁学特性分别用透射电子显微镜、扫描电子显微镜、X射线衍射仪和振动样品磁力计测试.结果表明,CoPt合金纳米线以fcc结构存在.当外加磁场与纳米线线轴平行时,测得的矫顽力为192 Ka/m,剩磁比为0.75;当外加磁场与纳米线线轴垂直时,所测得的矫顽力仅为48 Ka/m,剩磁比为0.25.表明纳米线阵列具有明显的各向异性,纳米线的易轴方向为其线轴方向.     

Preparation and characterization of highly ordered NiO nanowire arrays by sol-gel template method

Highly ordered nickel monoxide （NiO） nanowire arrays were fabricated by sol-gel synthesis within the pores of anodic alumina membrane （AAM）. Scanning electron microscopy （SEM）, high resolution transmission electron microscopy （HRTEM） and X-ray diffraction （XRD） were used to characterize the topography and crystalloid structure of NiO nanowire arrays. The length and diameter of the NiO nanowires depended on the thickness of the AAM and the diameter of the pores. The results indicated that the NiO nanowires were uniformly assembled into the ordered nanopores of the AAM and paralleled to each other. Nickel monoxide nanotubes were also fabricated with the same method by changing the immersing time. This new method to prepare NiO nanowire arrays may be important from gas sensors to various engineering materials.     

Fabrication and characterization of highly ordered Ni0.5Zn0.5Fe2O4 nanowire/tube arrays by sol-gel template method

Highly ordered nanowire/tube arrays of Ni0.5Zn0.5Fe2O4 were fabricated by the sol-gel method in the pores of anodic alu- mina membrane (AAM). Whether nanowires or nanotubes were fabricated depends on immersion time. The immersion time was 15-40 s for nanotubes and over 60 s for nanowires. The topography and crystalline structure of the nanowire arrays were character- ized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). It was found that the length and diameter of the Ni0.5Zn0.5Fe2O4 nanowires are related to the thickness of the AAM and the diameter of the pores. The results indicated that the Ni0.5Zn0.5Fe2O4 nanowires are uniform and parallel to each other.     

The Catalysis of NAD^＋ on Methanol Anode Oxidation Electrode for Direct Methanol Fuel Cell

A tentative idea of developing a liquid-catalytic system on methanol anode oxidation was proposed by analyzing the characteristics of methanol anode oxidation in direct methanol fuel cell. The kinetics of methanol oxidation at a glassy carbon electrode in the presence of nicotinamide adenine dinucleotide ( NAD^ ) was investigated. It is found that the current density of methanol oxidation increases greatly and the electrochemical reaction impedance reduces obviously in the presence of NAD^ compared with those in the adsenee of NAD^ . The catalytic activity of NAD^ is sensitive to temperature. When the temperature preponderates over 45℃, NAD^ is out of fuuction of catalysis for methanol oxidation, which is probably due to the denaturation of NAD^ at a relatively high temperature.     

Preparation and Optical Properties of V2O5 Nanotube Arrays

V2 O5 nanotube arrays in porous atomic alumina （ PAA ） template were obtained from V2O5 sols prepared by melt quenching method. X-ray powder diffraction and selected area electron diffraction investigations demonstrate that V2O5 nanotubes are orthorhombic. Results by scanning electron mieroscopy and transmission electron microscopy results shove that V2O5 nanotubes with a uniform diameter form highly ordered arrays. The diameter and length of the nanotubes depend on the pore diameter and the thickness of the PAA template used. It is proved that the sol-gel template process is a cost-saving , simple and readily-controlled method to prepare metal oxides nanomaterials .Owing to the quantum size effect. the optical absorption edge of V2O5 nanotubes in PAA ehibits a significant blue shift with respect to that of bulk V2O5.     

The Catalysis of NAD^＋ , NADP^＋ and Nicotinic Amide for Methanol Electrooxidation at Platinum Electrode

A group of liquid catalysts composed of nicotinic amide functioning on the anode of DMFC were investigated at a Pt eleetrode, which were nicotinic amide, nicotinamide adenine dinucleotide （ NAD^＋ ） and its phosphate （ NAD （ P ） ^＋ ）. The kinetics of methanol anode oxidation in the three reaction systems was compared by measuring poteatiodynarnic current-potential curves and AC impedances. The experimeatal results show that the dynamic behavior of methanol oxidation at a Pt electrode has been changed with adding the three substances. The influence of temperature on the catalysis of these coenzymes and nicotinic amicle was discussed by comparing the AC impedances spectra of methanol oxidation at differeat temperatures.     

The Catalysis of NAD~ on Methanol Anode Oxidation Electrode for Direct Methanol Fuel Cell

1　IntroductionFuelcell ,anidealenergyconversiondevicewithitsintrinsichighefficiencyandenvironmentalfriendly ,hasbeenpersistentlypursuedbymankindformorethanacen tury .Protonexchangemembranefuelcell (PEMFC)isbe lievedtobethebesttypeoffuelcellasthevehicular…