搜索到2956篇“ CYCLIC-VOLTAMMETRY“的相关文章
化学改性二氧化锰的循环伏安特性被引量:8
2000年
采用化学法制备改性二氧化锰,并对其进行了化学分析以及循环伏安扫描研究,结果表明:深度放电及浅度放电度表现出良好的可允性.掺铋改性二氧化锰将二电子放电反应提前进行,掺铋、镍改性化锰则将二电子放电子放电反应推至低电位进行.氧化还原过程中没有不可逆产物生成.
夏定国武少华于志辉焦庆影汪夏燕
关键词:化学法电极锰电池
超微柱电极上一次导数循环伏安法被引量:1
1992年
本文提出一次导数循环伏安法理论,其电流、电位关系接近于对称峰形波,有益于提高方法的灵敏度和分辨率,可用于分析和电化学研究工作. 1 理论1.1 一次导数循环伏安法电流方程式利用文献方法解柱形扩散方程求得线性扫描氧化波和还原波方程式,再将其结果对t微分。
徐涛吴志斌钟文英张祖训
关键词:循环伏安法
逐级电子转移过程的电化学研究(Ⅰ)——卷积伏安法的应用
1990年
本文采用线性扫描循环伏安法和0.5、1.5、2.5次微分循环伏安法等技术,研究了几种物质的逐级电子转移过程.从2.5次微分循环伏安曲线上观察到其它技术中难显现出的中间体的存在,清楚地描绘出中间体生成与反应的伏安过程.各种极谱理论的推论与上述结果一致.
袁倬斌韩树波
关键词:反应中间体水杨醛肟硫辛酸
Precise Chemistry Control Using Cyclic Stripping Voltammetry For Improved Through Silicon Via Fill
This paper discusses using cyclic stripping voltammetry (CVS) and cyclic pulse stripping voltammetry (CPVS) to...
Hong Shen
Synthesis,Crystal Structure and Electrochemistry Properties of a Cobalt(Ⅱ) Complex Based on Asymmetry Schiff Base Ligand被引量:3
2014年
A new cobalt(II) complex [Co(NO2-salen)2]·1.5H2O containing mono acetalization Schiff base ligand(NO2-salen = N-5-nitro-salicylideneamino ethanato) has been prepared through one-pot template condensation, and has been structurally characterized by elemental analysis, IR spectra and X-ray diffraction. It is formulated as C18H23CoN6O7.5, crystallizes in the hexagonal system, space group of R-3c with α = 25.895(18), b = 25.895(18), c = 35.075(6), γ = 120o, V = 20368(3) and Z = 36. The ligand of 5-nitrosalicylaldehyde-ethylene-diamine takes unusual mono asymmetry mode. The Co(II) ion exhibits a coordination number of six, and assumes a distorted octahedral geometry with a N2O4 donor set. The neutral monomeric units of [Co(NO2-salen)2]·1.5H2O are linked into a one-dimensional(1D) structure via the intermolecular hydrogen bonds and weak π-π stacking interactions. Cyclic-voltammetry measurement reveals the oxidation and reduction processes for the complex are irreversible in nature.
冯勋宋红亮冶保献霍素真谢世玉郭进中
关键词:CYCLIC-VOLTAMMETRY
石墨填充磷化铁复合碳电极性能研究被引量:1
2013年
以磷化铁和石墨为导电材料制备复合型碳电极,研究了石墨和磷化铁填充量对复合电极的电阻和循环伏安性能的影响,分别在浓度均为1mmol.L-1的K4[Fe(CN)6]溶液和对苯二酚溶液中循环伏安扫描.结果表明:复合电极电阻随着磷化铁含量的增加而增大,(1)在K4[Fe(CN)6]溶液中,当磷化铁含量为5%时,电极表面的氧化还原峰的对称性和可逆性较好,其氧化峰电流与扫描速度的ν1/2成线性关系,其线性方程为Ipa/(μA)=7.701ν1/2-1.295(r2=0.973),表明复合碳电极表面的氧化还原过程受扩散过程控制;(2)在对苯二酚溶液中,复合电极对对苯二酚具有良好的电催化活性,在对苯二酚的浓度为5×10-6~25×10-6 mol.L-1范围内,线性回归方程为Ipa/(μA)=18.60+1.90C(μmol.L-1),r2=0.994,检出限为9.76×10-7 mol.L-1.连续8次测定对苯二酚在复合碳电极上的重现性良好.
薛永亮谢德明刘勇
关键词:石墨复合电极循环伏安
生物素衍生物自组装膜制备及其覆盖度的电化学测定
2013年
利用循环伏安法和电化学交流阻抗谱研究了MBDA/Au,MBTA/Au,TBDA/Au,TBTA/Au修饰电极以及MBDA与DT混合自组装/Au、TBTA与DT混合自组装/Au修饰电极的覆盖度。结果表明这些自组装膜在金电极表面的覆盖度均比较高,达到99%以上;对同一类修饰电极,混合自组装膜的覆盖度高于单组分自组装膜的覆盖度,混合自组装体系的覆盖度随着DT比例的增加而增加;同类物质,长链化合物在金表面的覆盖度大于短链化合物,含二硫键的化合物与金电极的键合能力比含一个巯基的化合物键合能力强。
徐常龙曹小华陶春元柳闽生张爱东
关键词:自组装膜循环伏安法
Electroanalytical tools to investigate the divalent state of Eu(Ⅲ) and Nd(Ⅲ) ions in non-aqueous medium被引量:1
2012年
The divalent state of Ln(III) ions has attracted much interest because of their ability to serve isomorphously in many biological system of divalent Ca(II) ion. Therefore, present paper deals with the study of divalent state of Eu(III) and Nd(III) ions in non-aqueous medium. In present study, cyclic voltammetry and chronopotentiometry were utilized to establish the divalent state of Eu(III) and Nd(III) ions. The cyclic voltammetric technique showed two-step reduction process at cathode for both Ln(III) ions under specified experimental conditions and chronopotentiometric method also showed two different transition times (r). Looking to the shape of cyclic voltammogram we calculated het- erogeneous forward rate constant (K^fh, cm/s) and diffusion coefficient (D, cm2/s) for both ions, which suggested that sweep rate had great ef- fect on the shape of cyclic voltammogram of Eu(III) and Nd(III) ions. The result of chronopotentiometry also suggested that stable divalent states of Eu(III) and Nd(III) ions existed with chronopotentiogram with two distinct transition times. The diffusion coefficients (D, cm2/s) were calculated from Sand equation. The diffusion coefficients of both techniques were compared and the results suggested that the system at electrode surface was changing from being reversible to irreversible.
Jignasu P MehtaHimanshu M PandyaKahan I Pandya
关键词:CYCLIC-VOLTAMMETRY
Synthesis,Crystal Structure and Electrochemistry Properties of an Iron(Ⅲ) Complex Based on the 3,5-Pyridinedicarboxylate and Water Ligands
2010年
Reaction of 3,5-pyridine-dicarboxylic acid(3,5-PydcH2) with iron salt in hydrothermal condition results in the formation of a three-dimensional self-assembly network formulated as [C14H14Fe2N2O12]n,and it has been structurally characterized by elemental analysis,IR spectra and X-ray diffraction.It crystallizes in the monoclinic system,space group C2/c with a=9.9633(15),b=12.0942(18),c=7.4297(11)A and β=105.822o.The units of Fe2(pydc)2·2H2O are linked into a one-dimensional structure via the chelate carboxylate groups from the 3,5-pyridine-dicarboxylate.The interlayer hydrogen bonding interactions result in a three-dimensional supramolecular architecture.In the complex,the Fe(Ⅲ) ion displays a slightly distorted pentagonal bipyramidal geometry with seven coordination numbers.Cyclic-voltammetry measurement reveals the oxidation and reduction processes for the complex are quasi-reversible in nature.
冯勋赵建社王利亚师新阁
关键词:TOPOLOGYCYCLIC-VOLTAMMETRY
纳米金/碳纳米管修饰石墨电极测定邻苯二酚被引量:8
2010年
采用自沉积方法将HAuCl4直接还原成纳米金颗粒并修饰在碳纳米管表面,所制备的纳米金(Au-CNTs/C)修饰电极对邻苯二酚(CAT)具有高的电催化氧化作用.采用循环伏安法考察CAT在Au-CNTs/C电极上的电化学行为,发现CAT在该修饰电极上发生可逆的氧化还原反应,在0.25V有明显的氧化峰.在磷酸盐缓冲溶液PBS(pH7.4)中,CAT的响应电流与浓度在5.0×10-7~5.0×10-3mol/L范围内呈线性关系,相关系数为0.9992,检出限为3.3×10-7mol/L.
罗启枚刘登友王辉宪周华周栋
关键词:纳米碳管循环伏安法化学修饰电极