共查询到16条相似文献,搜索用时 187 毫秒
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本文采用热分解法制备Ti/Ru-Ir-Sn氧化物阳极,运用TGA、SEM、EDS、循环伏安、电化学交流阻抗、极化曲线以及强化电解寿命测试方法,探讨添加不同含量碳纳米管(CNTs)对Ti/Ru-Ir-Sn氧化物阳极的影响规律. 热重分析和阳极能谱数据表明,在烧结温度470 oC条件下CNTs未发生高温氧化分解,仍以单质形式存在阳极涂层中. 与对比样品相比,涂层表面裂纹增多,但仍保持典型形貌. 添加CNTs显著改善了Ti/Ru-Ir-Sn氧化物阳极的电化学性能,增大了阳极的活性表面积,减小了涂层内部电阻,提高了阳极析氯电催化活性,析氯电位增加缓慢,阳极强化电解寿命也得到明显延长. 其中,添加0.1 g·L-1 CNTs的Ti/Ru-Ir-Sn氧化物阳极电催化活性和稳定性最优. 相似文献
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铱钽钛金属氧化物阳极的电化学特性 总被引:9,自引:0,他引:9
采用热分解方法在钛基体上制备铱钽钛金属氧化物阳极 ,用扫描电镜对阳极涂层显微形貌进行分析 ,通过强化电解寿命试验、开路电位测试、消耗率试验及循环伏安曲线研究了金属氧化物阳极的电化学性能 .SEM分析结果表明铱钽钛金属氧化物阳极涂层呈现多孔多裂纹形貌结构 .随阳极涂层组成不同 ,涂层显微形貌表现出很大差异 ,这种差异直接影响阳极电化学性能 .电化学性能试验结果表明铱钽钛金属氧化物阳极在酸性介质和海水中具有良好的电化学稳定性和电化学活性 .此外 ,铱钽钛金属氧化物阳极在海水中的消耗率很低 ,属于不溶性的阳极材料 ,作为外加电流阴极保护用辅助阳极具有广泛的应用前景 . 相似文献
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根据镀液中待测组份或杂质的电化学特性和添加剂对金属电沉积过程的阻化或活化效应,建立了测定某些镀液组份、一些杂质和常用添加剂的浓度的直接伏安法、间接伏安法和金属沉积层阳极溶出伏安法。这些方法测定步骤简单、快速,适合于电镀生产监控和电镀工艺研究。 相似文献
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液流催化燃料电池(LCFC)是一种可以在温和条件下转化生物质为电能的新型装置,但其运行优化条件与相应机制尚不清晰.本工作分析了阳极电解液的pH和温度对LCFC性能的影响规律.其中,极化曲线和功率密度曲线采用线性扫描伏安法测定,以评估电池的产电性能;阳极液的Mo5+浓度与总有机碳用于衡量有机底物与杂多酸的氧化还原反应进行... 相似文献
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玻碳电极阳极微分脉冲伏安法测定雌激素 总被引:1,自引:0,他引:1
本文报道了雌激素的阳极微分脉冲伏安法测定.雌激素在甲醇-Britton-Robinson缓冲液中,以玻碳为工作电极,能获得一个良好的阳极氧化伏安峰,峰高与激素的浓度在1.0×10~(-6)~4.0×10~(-5)M之间有良好线性关系,峰电位随溶液pH值增加而降低,经循环伏安法验证,电极反应为不可逆反立.并报道了孕妇尿中雌三醇的测定. 相似文献
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A. B. Lebed’ Yu. P. Zaikov A. M. Potapov I. A. Shpoltakova G. I. Mal’tsev 《Russian Journal of Inorganic Chemistry》2013,58(4):427-431
During silver electrowinning in refining technology, irrespectively of the nature of electrolyte and anode material, an anode deposit is formed due to oxidation of singly charged silver ions to higher degrees of oxidation (+2 and +3) under polarization. Absorption spectra of Ag(II) have been obtained in solutions with various concentrations of silver ions and nitric acid using anodic polarization in combination with electronic absorption spectroscopy; silver ions of high oxidation degrees were found to be unstable in solutions. At anode potentials φa ≥ 1.15–1.22 V, Ag(I) ions in liquid phase are oxidized to Ag(II), which paint the anolyte; their content depends on silver and nitric acid concentrations in the electrolyte. The deposit crystallizes on anode at potential φa ≈ 1.5 V. Chemical analysis, X-ray powder diffraction, and a thermogravimetric study of the anode deposit have made it possible to identify its initial composition as Ag7O8NO3. The deposit composition varies in time as a result of reduction of highly oxidized silver. 相似文献
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S. Ramalingam V. S. Muralidharan A. Subramania 《Journal of Solid State Electrochemistry》2009,13(11):1777-1783
Cu-TiO2 nanocomposites were prepared by electrodeposition method onto copper substrate using an acid copper plating bath containing
dispersed nanosized TiO2. The composition of codeposited TiO2 nanoparticles in the composite coatings was controlled by the addition of different concentrations of TiO2 nanoparticles in the bath solution. The average crystallite size was calculated by using X-ray diffraction analysis and it
was ~32 nm for electrodeposited copper and ~33 nm for Cu-TiO2 composite coatings. The crystallite structure was fcc for electrodeposited copper and Cu-TiO2 nanocomposite coatings. The surface morphology and composition of the nanocomposites were examined by scanning electron microscopy
and energy dispersive X-ray spectroscopy analysis. The effect of TiO2 content on the corrosion and wear resistance properties of the nanocomposite coatings was also presented. The codeposited
TiO2 nanoparticles in the deposit increased the corrosion and wear resistance, which were closely related with TiO2 content in the nanocomposites. The wear resistance and microhardness of the Cu-TiO2 nanocomposite coatings were higher than electrodeposited copper. The corrosion resistance property of the electrodeposited
copper and Cu-TiO2 nanocomposite coatings was evaluated by electrochemical impedance and Tafel polarization studies. Cu-TiO2 composite coatings were more corrosion resistant than electrodeposited copper. 相似文献
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Micron and nano-scale hydroxyapatite (HA) were coated successfully on AA6061-T4 substrates by sol–gel method. Besides, the effects of coating thickness on adhesion strength and corrosion behaviour of the coatings were studied. Corrosion resistance was measured by potentiodynamic polarization test using a potentiostat under in vitro conditions. The coatings before and after corrosion tests were characterized by adhesion tests, a scanning electron microscopy attached with EDS and X-ray diffraction analysis. The results revealed that all the coatings exhibit a passive behaviour in Ringer’s solution. Specimens coated with nano-scale HA had the higher corrosion resistance than micro-scale coatings. The highest corrosion resistance appeared to be for the ~30 μm nano-scale HA coated substrates. However, for micro-scale HA coatings, the highest adhesion resistance was obtained at ~30 μm film thickness. 相似文献
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V. I. Eberil' N. S. Fedotova E. A. Novikov A. F. Mazanko 《Russian Journal of Electrochemistry》2000,36(12):1296-1302
Dependences of the current efficiency for chlorate and current losses for the oxygen evolution on the anode potential are studied. The study is performed in a cell without directed electrolyte circulation during the electrolysis of chloride–chlorate solutions of various compositions at the ORTA and ORTA-I1 anodes, at different current densities, temperatures, and solution pH. At identical temperatures, the dependences have extremums. The anode potentials corresponding to extremums coincide with critical potentials (found in a polarization study) for anodes covered with coatings containing ruthenium dioxide. The current efficiency for chlorate at ORTA-I1 is higher than that at ORTA, while the extremum region is less pronounced. The problem of how to substantially decrease the specific power consumption in the chlorate production by simultaneously increasing the anodic current density and the electrolysis temperature is considered. 相似文献
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Vathsala Kanagalasara Thimmappa Venkatarangaiah Venkatesha 《Journal of Solid State Electrochemistry》2012,16(3):993-1001
Pure zinc and Zn–MoS2 composite coatings were prepared by electrodeposition from zinc sulfate–chloride bath containing uniformly dispersed MoS2 nanoparticles. The effect of MoS2 on the deposition properties morphology, crystallographic orientation, and corrosion behavior were studied. The electrokinetic
properties (zeta potential) and size distribution statistics in plating bath for the particles were evaluated using dynamic
light scattering experiments. The Zn and Zn–MoS2 deposition process was studied by linear polarization and cyclic voltammetry. Scanning electron microscopy, energy dispersive
X-ray analysis, X-ray diffraction analysis, and potentiodynamic polarization measurements were used to characterize the coatings.
The addition of MoS2 to the electrolyte significantly changed the microstructure and crystallographic orientation of the zinc deposits and enhanced
the corrosion resistance of the coatings. The morphological and electrochemical properties of the zinc coatings were observed
to be significantly affected by the incorporation of MoS2 particles into the zinc matrix. 相似文献
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通过在酒石酸钾钠体系中加入聚丙烯腈(PAN)、碳化钨(WC)和PbO固体颗粒,在Ti阳极上电沉积制得Pb-PAN-WC复合镀层。 主要研究了电沉积工艺条件(电流密度、温度等)对Pb-PAN-WC复合镀层沉积速度及析氧动力学参数的影响。 在ZnSO4-H2SO4体系中测定的阳极极化曲线表明,最佳工艺条件及固体颗粒加入量为:电流密度1.5 A/dm2,温度35 ℃,15 g/L的PAN,40 g/L的WC。 通过和纯铅镀层的阳极极化曲线和析氧动力学参数对比可知,Pb-PAN-WC复合镀层的电化学性能优于纯铅镀层。 相似文献