排序方式: 共有16条查询结果,搜索用时 31 毫秒
11.
Abdollatif Shafaei Douk Hamideh Saravani Meissam Noroozifar 《International Journal of Hydrogen Energy》2018,43(16):7946-7955
A one-pot synthesis method is utilized for the fabrication of ultrasmall platinum-silver nanoparticles decorated on graphene (PtAg/G) catalyst. This method has several advantages such as inexpensiveness, simplicity, low temperature, surfactant free, reductant free, being environmentally friendly and greenness. In this work, graphene and silver formate were dispersed in ultrapure water in an ultrasonic bath at 25 °C followed by through a galvanic displacement reaction; to prepare PtAg/G, PtCl2 was added to the suspension under mild stirring condition. The morphology, crystal structure and chemical compositions of the as-fabricated PtAg/G and Pt/C catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Energy dispersive X-ray spectroscopy (EDS) techniques. Electrochemical techniques, including cyclic voltammetry (CV) and chronoamperometry (CA) measurements were used to analyze the electrochemical activity of the PtAg/G and Pt/C catalysts. The TEM images illustrate the uniform distribution of ultrasmall PtAg nanoparticles with the average size of 2–3 nm on the graphene nanosheets. The PtAg/G promoted the current density 2.46 times as much as Pt/C with a negative shift in onset oxidation potential and peak potential for oxidation reaction of methanol. Besides, the novel PtAg/G catalyst shows large electrochemically active surface area, lower apparent activation energy, and higher levels of durability in comparison to the Pt/C catalyst for the oxidation of methanol. The PtAg/G catalyst depicts extraordinary catalytic performance and stability to those of the Pt/C catalyst toward methanol oxidation in alkaline media. 相似文献
12.
Hamidi Zeinab Mosavian Seyed Yousef Sabbaghi Najmeh Karimi Zarchi Mohammad Ali Noroozifar Meissam 《Iranian Polymer Journal》2020,29(3):225-239
Iranian Polymer Journal - Cross-linked poly (N-alkyl-4-vinylpyridinium) iodides abbreviated as P4-VPMI, P4-VPOI and P4-VPDI, were synthesized from quaternization of poly(4-vinyl pyridine)... 相似文献
13.
Abdollatif Shafaei Douk Hamideh Saravani Meissam Noroozifar 《International Journal of Hydrogen Energy》2017,42(22):15149-15159
In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/glassy carbon electrode (G/GCE) surface in the HCl (5 wt.%) was employed for fabrication of the PdCu nanostructures by galvanic displacement reaction. This method has a number of advantages including being environmentally-friendly, simplicity, inexpensiveness and fast. The PdCu nanostructures decorated on the G/GCE were fabricated in two steps: (1) electrochemical reduction reaction of copper(II) formate to Cu on the G/GCE and (2) the galvanic replacement reaction between Cu and Pd2+ ions. The physical and electrochemical properties of as-prepared PdCu/G were investigated via Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Cyclic Voltammetry, Chronoamperometry, and Electrochemical Impedance Spectroscopy. The PdCu/G compositional effect on ethanol oxidation in alkaline media is investigated. The results were shown that the catalytic activity and durability of PdCu/G catalyst are superior to those of Pd/C electrocatalyst for ethanol oxidation. The PdCu/G increased the current density 6.2 times more than Pd/C with a 50 mv negative shift in onset potential for electrooxidation of ethanol. Besides, the novel PdCu/G catalyst exhibits large electrochemically active surface area, lower apparent activation energy, higher levels of stability, poisoning tolerance, and lower charge transfer resistance compared to the Pd/C for the oxidation of ethanol. 相似文献
14.
Habibi-Khorassani Sayyed Mostafa Shahraki Mehdi Noroozifar Meissam Darijani Mahdieh Dehdab Maryam Yavari Zahra 《Protection of Metals and Physical Chemistry of Surfaces》2017,53(3):579-590
Protection of Metals and Physical Chemistry of Surfaces - The inhibition performance of penicillin G(I), methicillin(II) and nafcillin(III) on the corrosion of aluminum in a 1 M HCl solution has... 相似文献
15.
Platinum nanoparticles self-assembled onto chitosan membrane as anode for direct methanol fuel cell 总被引:1,自引:1,他引:0
Mehri-Saddat?Ekrami-Kakhki Mozhgan?Khorasani-MotlaghEmail author Meissam?Noroozifar 《Journal of Applied Electrochemistry》2011,41(5):527-534
In this article, incorporation of platinum nanoparticles (PtNPs) into chitosan-coated glassy carbon (GC) electrode for methanol
oxidation is studied. Pt–chitosan nanocomposites are prepared and characterized by UV–vis spectroscopy, X-ray powder diffraction
(XRD), and transmission electron microscopy (TEM). Catalytic activity of GC–PtNPs–chitosan electrode for the electrooxidation
of methanol is studied by cyclic voltammetry and chronoamperometry. The current density and potential of the methanol oxidation
are affected by amount of platinum, methanol, sulfuric acid, and chitosan. The current density of the methanol oxidation at
GC–PtNPs–chitosan electrode is measured in optimized conditions and compared with that obtained at the glassy carbon modified
electrode by Pt with different polymers. 相似文献
16.
Mehdi Zareie Yazdan-Abad Meissam Noroozifar Nafiseh Alfi Ali Reza Modarresi-Alam Hamideh Saravani 《International Journal of Hydrogen Energy》2018,43(27):12103-12109
For the first time, galvanic reduction by zinc sheet is used as a new strategy to prepare modified electrodes. In this work, glassy carbon electrode (GCE) was modified by decoration of Pd nanostructures on carbon nanotubes (Pd/CNTs). In this method, deposited PdCl2 on CNTs was directly reduced to metallic Pd nanostructure using a zinc sheet in HCl (2% w/w) solution. This approach offers a number of advantages including being very fast, simple and green; and modified electrodes show high activity. The prepared catalyst is characterized by Field Emission Scanning Electron Microscopy, X-Ray Diffraction and energy-dispersive X-ray and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). In addition, electrochemical measurements show that the performance as well as the stability of the as-prepared catalyst for ethanol oxidation is outstanding. The Pd/CNTs catalyst shows higher mass current density, which is 7.9 times as high as that of commercial Pd/C. 相似文献