共查询到19条相似文献,搜索用时 171 毫秒
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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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铂微粒修饰聚2,3—二甲氧基苯胺电极对甲醇的电催化作用 总被引:3,自引:0,他引:3
将以铂微粒修饰玻碳电极为基体的聚2,5-二甲氧基苯胺膜形成修饰电极循环伏安实验表明,Pt/PDMA/GC电极对甲醇氧化比分散于破碳电极上的铂催化活性更大,讨论了PDMA膜厚度,铂微粒含量及甲醇浓度对催化活性的影响,这种电极在酸性甲醇溶液中有良好的稳定性。 相似文献
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利用微分电化学质谱(DEMS)研究了Mo修饰的Pt电极上CO、甲醛和甲醇的电催 化氧化,证实了Mo(IV)是催化活性样品,而且它只对弱吸附CO的氧化起催化作用, 对强吸附CO的氧化没有催化活性。在低于0.4 V的电位下,吸附在Pt电极上的Mo结 甲醇和甲醛的催化氧化是通过弱吸附CO的氧化路径进行的。 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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铂微粒修饰聚2,5-二甲氧基苯胺电极对甲醇的电催化作用 总被引:1,自引:0,他引:1
将以铂微粒修饰玻碳电极(GC)为基体的聚2,5-二甲氧基苯胺膜(PDMA)形成修饰电极(Pt/PDMA/GC).循环伏安实验表明,Pt/PDMA/GC电极对甲醇氧化比分散于玻碳电极上的铂催化活性更大。讨论了PDMA膜厚度、铂微粒含量及甲醇浓度对催化活性的影响。这种电极在酸性甲醇溶液中具有良好的稳定性。 相似文献
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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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聚2,5-二甲氧基苯胺的合成与表征 总被引:2,自引:0,他引:2
报导了聚2,5-二甲氧基苯胺(P25DMAn)的化学与电化学合成,并用元素分析、FTIR、UV-VIS吸收光谱、电导率测定以及电化学等手段对该聚合物进行了表征.P25DMAn类似聚苯胺(PAn)的结构,是由其单体通过氮原子N在对位上键合而成.P25DMAn是一种能溶于多种有机溶剂如THF、CH2Cl2、CHCl3、DMSO、DMF等.并具有极好的环境稳定性,优良的电活性和相当高的电导率的高聚物.因此,P25DMAn是一种很有应用前景的新的导电高聚物. 相似文献
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Jun Yano Akihiko Muta Yutaka Harima Akira Kitani 《Journal of Solid State Electrochemistry》2011,15(3):601-605
A poly(2,5-dimethoxyaniline) (PDMA) film was coated on the iron surface by the electropolymerization of 2,5-dimethoxyaniline in neutral buffer solution (pH?6.86). The PDMA film strongly adhered to the surface because of the polar methoxy groups of the PDMA molecules. The fact that no electrochemical response of the PDMA film-coated iron electrode to dissolved Fe2+ exhibited that the PDMA film was less permeable to dissolved species, acting as a diffusion barrier against agents causing corrosion such as H2O and O2. The PDMA film coating greatly lowered the anodic current peak ascribed to the anodic dissolution of iron and the corrosion current in strongly acidic medium, 0.5?M H2SO4 aqueous solution (1?M?????mol?dm??) as well as neutral medium (pH?6.86). The high anti-corrosion ability was due to a hybrid effect of the PDMA film not only as the diffusion barrier, but also as an in situ oxidant in spite of the slight redox activity of PDMA. In addition, the PDMA film is much more durable and adhesive than polyaniline film against over-oxidation. 相似文献
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Polyaniline doped with camphor sulfonic acid, poly(2,5-dimethoxyaniline) and their copolymers were synthesized by interfacial method. The FT-IR spectra, UV-Vis absorption spectra and X-ray diffraction patterns were used to characterize the molecular structures of the polymers. The morphology of the polymers was studied by using SEM and TEM. Voltammetric study was done to investigate the electrochemical behavior of these polymers. The results show that the polymers were in microscale with the different shapes such as rod, flake and sphere, respectively. All the homopolymers and copolymers had a poor crystallinity. The conductivity of the copolymers of aniline with 2,5-dimethoxyaniline decreased with increase of 2,5-dimethoxy-aniline molar content. 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
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《Electrochemistry communications》2007,9(1):97-102
The polyaniline/polysulfone (PAN/PSF) composite films were prepared by electropolymerization, and then platinum was deposited into this composite film to obtain the platinum-modified polyaniline/polysulfone(Pt/PAN/PSF) composite film electrodes. Their component, morphology and structure were characterized by FTIR spectra, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results show that the composite film has a bi-layer structure with asymmetrical pores, and the platinum particles are homogeneously dispersed in the modified film electrodes. The cyclic voltammetry and electrochemical impedance spectroscopy techniques were applied to investigate the electrochemical properties and the electrocatalytic activity of the modified film electrodes, which show a promotive action for methanol oxidation and the methanol oxidation under a diffusion-controlled process. 相似文献
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导电高聚物聚2,5-二甲基苯胺的化学合成与特性 总被引:2,自引:0,他引:2
报道了聚2,5-二甲基苯胺(PDMeAn)的化学合成,并用标准四探针方法测定其电导率,以FTIR、UV-Vis吸收光谱、元素分析和CV法对其性质进行了研究,PDMeAn的结构与聚苯胺和聚2,5-二甲氧基苯胺的结构类似,是由其单元通过氮原子(N)在对位上键合而成,本征态的PDMeAn能溶于多种有机溶剂,如CH2Cl2、CHCl3、DMSO、DMF等。 相似文献
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Platinum was incorporated into a polypyrrole/glucose oxidase electrode by immersion in a hexachloroplatinate(IV) solution after electrochemical oxidation of the polypyrrole film; dispersed platinum was then formed by electrochemical reduction. The platinized electrode reproducibly yielded a response to glucose (20 mM) which was typically about 40% higher than that obtained in the absence of platinum microparticles in the polypyrrole/glucose oxidase film. 相似文献
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《Electrochemistry communications》2007,9(7):1833-1839
An investigation of the electrochemical behaviour of gold electrodes coated with poly(ethylene glycol) (PEG), poly(acrylic acid) (PAA) and nanopatterned PAA/PEG layers is presented. Plasma-enhanced chemical vapour deposition and colloidal lithography were used to produce nanodomes of PAA in a matrix of PEG. The electrochemical response at these nanostructured electrodes was studied as a function of the probe ion charge. Results show that the film structures allow the electrodes to retain their electrochemical activity while minimising surface fouling and will thus be useful in the development of electrochemical nanobiosensors for various applications. 相似文献
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《Electrochemistry communications》2008,10(4):527-530
Multilayer films, consisting of poly(2,5-dimethoxyaniline) (PDMA) and phosphotungstic acid (PTA) as alternative layers are assembled on a glassy carbon (GC) electrode to obtain (PDMA/PTA)n layer-by-layer (LBL) film, (where n = number of layers of PDMA/PTA) through electrochemical polymerization and chemical treatment with PTA. The film assembly, electrochemical property as well as the electroactivity of GC/(PDMA/PTA)n toward oxidation of ascorbic acid (AA) were investigated. The enhanced electrocatalytic activity of LBL (PDMA/PTA)n film towards AA was attributed to the existence of tungsten atoms in the interlayer of PDMA that augments the electron transfer processes. 相似文献