共查询到18条相似文献,搜索用时 515 毫秒
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采用电化学沉积技术在3-氨丙基三甲基硅氧烷修饰的多孔氧化铝膜板中制备了具有不同Pt/Ru原子比的双元Pt/Ru阵列纳米管电极(NTAEs)。分别用X-射线衍射和扫描电镜表征了催化剂结构和形态。电化学结果表明:通过控制前驱沉积液的浓度可得到不同PtRu原子比的NTAEs。所制备的Pt 或 Pt/Ru合金阵列纳米电极的真实表面积大,催化活性强,有利于物质传输,对甲醇电氧化显示出显著的催化性能。实验中还系统研究了催化剂组成与CO和CH3OH电催化氧化性能的关系,发现Pt/Ru=50:50的阵列纳米管电极对CO电氧化显示出最好的催化活性;对甲醇电氧化,则Ru原子比为40%的催化剂显示最佳催化性能。 相似文献
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Pt微粒修饰纳米纤维聚苯胺电极对甲醇氧化电催化 总被引:9,自引:0,他引:9
以脉冲电流法制备的纳米纤维状聚苯胺(PANI)为Pt催化剂载体,用它制备了甲醇阳极氧化的催化电极Pt/(nano-fibular PANI).研究结果表明, Pt/(nano-fibular PANI)电极对甲醇氧化具有很好的电催化活性,并有协同催化作用.在相同的Pt载量条件下, Pt/(nano-fibular PANI)电极比Pt微粒修饰的颗粒状聚苯胺电极Pt/(granular PANI)具有更好的电催化活性.此外, Pt的电沉积修饰方法同样影响Pt/(nano-fibular PANI)电极对甲醇氧化的催化活性.脉冲电流法沉积Pt形成的复合电极较循环伏安法电沉积得到的Pt复合电极具有更优异的催化活性. 相似文献
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研究了电化学方法制备的铂微粒弥散的聚2,5-二甲氧基苯胺膜电极对甲醇电氧化的催化行为以及影响催化活性的主要因素。以XPS、SEM表征了这种电极材料的表面结构,结果表明,在酸性介质中,该膜电极对甲醇电氧化有高的催化活性和稳定性。 相似文献
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研究了电化学方法制备的铂微粒弥散的聚2,5-二甲氧基苯胺膜电极对甲醇电氧化的摧化行为以及影响催化活性的主要因素,以XPS、SEM表征了这种电极材料的表面结构。结果表明,在酸性介质中,该膜电极对甲醇电氧化有高的催化活性和稳定性。 相似文献
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纳米TiO2-Pt修饰电极的制备及电催化活性 总被引:10,自引:0,他引:10
采用电化学合成前驱体直接水解法和电沉积法制备高活性纳米TiO2-Pt修饰电极,并使用扫描电子显微镜(SEM)对电极的表面形貌和结构进行了表征; 通过循环伏安法研究了纳米TiO2-Pt修饰电极在H2SO4溶液中的电化学行为以及对Mn2+氧化为Mn3+的电催化活性. 结果表明,纳米TiO2的晶粒大小约30 nm,修饰在纳米TiO2膜表面的Pt微粒呈现单分散状态,平均粒径约60 nm,纳米TiO2-Pt修饰电极的电化学性能优于纯Pt电极,对Mn2+的电氧化具有高催化活性,非均相无隔膜电解氧化Mn2+生成Mn3+平均电流效率可达86%. 相似文献
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金属化聚邻甲苯胺膜修电极的性能研究 总被引:1,自引:0,他引:1
在聚邻甲苯胺(POT)膜修饰电极上用电化学法沉积Pt微粒,由SEM与XRD表征其表面形态与晶面取向,同时研究异丙醇在金属化POT膜电极上的氧化行为。结果表明,Pt在POT膜上的沉积呈现晶面择优取向的现象,况且POT质子掺杂后,由于电化学活性增强,影响了沉积铂微粒的尺寸和粒径分布,异丙醇的电氧化可发生在POT的电化学活性区,当电位大于0.70V(SCE)时,POT不再呈氧化还原活性,异丙醇的电氧化主要在铂微粒上进行,聚合物不仅作为铂微粒的载体而且自身参加反应,这种微异相催化体系需用新的模型描述。 相似文献
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在聚邻甲苯胺 (POT)膜修饰电极上用电化学法沉积Pt微粒 ,由SEM与XRD表征其表面形态与晶面取向 ,同时研究异丙醇在金属化POT膜电极上的氧化行为 .结果表明 ,Pt在POT膜上的沉积呈现晶面择优取向的现象 ,况且POT质子掺杂后 ,由于电化学活性增强 ,影响了沉积铂微粒的尺寸和粒径分布 .异丙醇的电氧化可发生在POT的电化学活性区 ,当电位大于 0 .70V(SCE)时 ,POT不再呈氧化还原活性 ,异丙醇的电氧化主要在铂微粒上进行 .聚合物不仅作为铂微粒的载体而且自身参加反应 ,这种微异相催化体系需用新的模型描述 相似文献
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载铂微粒的聚苯胺薄膜电极对甲醇的电催化氧化 总被引:9,自引:1,他引:9
用电化学方法制备的载有金属铂微粒的聚苯胺(PAn)膜电极对甲醇在硫酸中的电化学氧化具有很高的催化活性。电极材料中的铂微粒是沿着聚苯胺的纤维分布的,而且主要沉积在PAn膜的表面。 相似文献
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We show that the addition of white dextrin during the electrochemical deposition of platinum nanostructures (nano-Pt) on a glassy carbon electrode (GCE) results in an electrochemically active surface that is much larger than that of platinum microparticles prepared by the same procedure but in the absence of dextrin. The nano-Pt deposits are characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy, and electrochemical methods. The SEM images reveal deposits composed of mainly nanoparticles and short nanorods. The GCE was applied as a novel and cost-effective catalyst for methanol oxidation. The use of nano-Pt improves the electrocatalytic activity and the stability of the electrodes. Figure
(A) SEM image of the Pt nanostructures. (B) Electrochemical responses of the Pt nanostructures (solid line) and Pt microparticles (line) in 1.4 M CH3OH + 0.5 M H2SO4 solution at υ?=?50 mV s?1. Novel Pt nanostructures were electrodeposited at the surface of glassy carbon electrode in the presence of white dextrin as an additive, which exhibit high electrocatalytic activity towards methanol oxidation due to their highly electrochemically active surface area. 相似文献
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Effect of the iridium oxide thin film on the electrochemical activity of platinum nanoparticles 总被引:1,自引:0,他引:1
Chen A La Russa DJ Miller B 《Langmuir : the ACS journal of surfaces and colloids》2004,20(22):9695-9702
The influence of the iridium oxide thin film on the electrocatalytic properties of platinum nanoparticles was investigated using the electro-oxidation of methanol and CO as a probe. The presence of the IrO(2) thin film leads to the homogeneous dispersion of Pt nanoparticles. For comparison, polycrystalline platinum and Pt nanoparticles dispersed on a Ti substrate in the absence of an IrO(2) layer (Ti/Pt) were also investigated in this study. Inverted and enhanced CO bipolar peaks were observed using an in situ electrochemical Fourier transform infrared technique during the methanol oxidation on the Pt nanoparticles dispersed on a Ti substrate. Electrochemical impedance studies showed that the charge transfer resistance was significantly lower for the Ti/IrO(2)/Pt electrode compared with that of the massive Pt and Ti/Pt nanoparticles. The presence of the IrO(2) thin film not only greatly increases the active surface area but also promotes CO oxidation at a much lower electrode potential, thus, significantly enhancing the electrocatalytic activity of Pt nanoparticles toward methanol electro-oxidation. 相似文献
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<正>The electrocatalytic oxidation of methanol at the platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes (Eu-Fe film) was investigated for the first time by cyclic voltammetry.Compared with the bare platinum electrode,the results showed that the modified electrode had excellent electrocatalytic activity for the oxidation of methanol;the oxidation peak potential shifted more negatively and the peak current increased about twenty times.The electrooxidation of methanol at the modified electrode with Eu-Fe cyanide-bridged binuclear complexes material exhibited the better tolerance capacity to poison of intermediate species;the peak current was proportional to the concentration of methanol in the range of 0.5-2.0mol/L (R~2 = 0.9991,n =7),which was a comparatively wider linear range.Moreover,based on the linear relationship between the peak current and the square root of scan rate,electrocatalytic oxidation process of methanol was confirmed to be a diffusion control process.Furthermore,according to the counting of electron transfer number(n_α) in the rate-limiting step and the slope of linear equation between acidity of electrolyte and the oxidation peak potential(E_p),the possible mechanism of the electrooxidation of methanol at the modified electrode was primarily discussed. 相似文献
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Xinxian Zhong Jinhua Chen Bo Liu Yan Xu Yafei Kuang 《Journal of Solid State Electrochemistry》2007,11(4):463-468
Organic molecule neutral red (NR), as electron transfer mediator, was introduced in the anodic electrocatalyst system for
methanol oxidation and the resulting electrode was investigated by cyclic voltammetry, polarization method, and electrochemical
impedance spectroscopy. For the same loading mass of platinum catalyst, 1.25 times larger exchange current density, 1.83 times
higher specific activity, and better long-term cycle stability can be obtained at Pt/NR/graphite electrode, as compared to
the electrode without NR. These results indicate that neutral red plays an important role on the enhanced electrocatalytic
activity of platinum catalyst for methanol oxidation. 相似文献
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Meltem Düdükcü Anya Beytaroğlu Nejat Yilmaz Fatih Köleli 《Russian Journal of Electrochemistry》2011,47(8):959-964
The catalytic behavior of stainless steel (SS) electrode modified by a thin film of polyaniline (PANI) containing platinum
particles was studied for electrooxidation of methanol and compared with a platinated Pt/PANI electrode in acidic aqueous
solution. Cyclic voltammetry (CV), chronoamperometry, CO stripping techniques were used to investigate electrochemical properties
and electrocatalytic activity of SS/PANI/Pt and Pt/PANI/Pt electrodes. The morphology and particle size of Pt catalysts were
characterized by Transmission Electron Microscopy (TEM) measurement. The effects of various parameters such as thickness of
polymer film, medium temperature and stability of the modified electrodes on methanol oxidation were also investigated. The
results indicated that the modified SS electrode exhibited a considerably high electrocatalytic activity on the methanol oxidation
as well as the modified Pt electrode. 相似文献
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铂微粒修饰的聚苯胺薄膜电极对甲醛氧化的电催化作用 总被引:6,自引:2,他引:6
以电位扫描法把铂微粒沉积在聚苯胺(PAn)薄膜是上以制得铂微粒修饰的聚苯胺薄膜电极。该电极的催化活性以甲醛在0.5mol/L硫酸溶液中的电化学氧化测定。它集催化活性和电活性于一体,对甲醛在酸性介质中的电化学氧化显示了非常高的电催化活性。较之裸铂电极,PAn薄膜电极,其催化电流提高10倍。铂微粒的大小,分布和载量,甲醛的浓度,基体金属的种类等因素对电极材料的催化活性均有影响。 相似文献