توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Fabrication of Gas Diffusion Electrodes using Carbon Nanotube–Supported Pt Alloys
اطلاعات انتشار: اولین کنفرانس ملی هیدروژن و پیل سوختی، سال
تعداد صفحات: ۱۰
In this paper, we report the use of Pt binary and ternary alloys prepared by alloying of Pt with transition metals, as catalysts for fabricating of gas diffusion electrodes (GDEs). The electrocatalytic properties for the oxygen reduction reaction (ORR) we<\div>

۲Gas Diffusion Electrodes for Direct Methanol Fuel Cells using Methanol–Resistant Catalyst
اطلاعات انتشار: اولین کنفرانس ملی هیدروژن و پیل سوختی، سال
تعداد صفحات: ۱۲
This work try to solve the problem of methanol cross over through the polymer electrolyte in direct methanol fuel cells (DMFCs) by developing new cathode electrocatalysts with both higher methanol tolerance and higher activity for the oxygen reduction rea<\div>

۳Improve the Catalytic Activity of Pt in GDEs and Comparison of the Acidic and Alkaline Electrolytes
اطلاعات انتشار: اولین کنفرانس ملی هیدروژن و پیل سوختی، سال
تعداد صفحات: ۱۱
The objective of this study is to improve the catalytic activity of platinum by alloying with transition metals (Pd and Cd) in gas diffusion electrodes (GDEs) on oxygen reduction reaction (ORR) at cathode site and comparison of the acidic and alkaline ele<\div>

۴Study of Dielectric Constant effects on preparation conditions of gas diffusion electrodes for Oxygen Reduction Reaction in polymer electrolyte membrane fuel cells
اطلاعات انتشار: دومین همایش پیل سوختی ایران، سال
تعداد صفحات: ۴
The effect of solvent dielectric constant that used for preparation of catalyst layer of gas diffusion electrode (GDE) in Proton exchange membrane fuel cell (PEMFC) cathodes for oxygen reduction was investigated. Electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), Chronoamperometry (CA) and Cyclic Voltammetry (CV) measurements were carried out at 298K in 2.0 M H2SO4 on electrodes with same nafion loading and Pt loading but different solvent dielectric constant for ink preparation. In all electrodes nafion loading of 0.5 mgcm–2 and Pt loading of 1 mgcm–2 were chose. EIS supplied information on the charge transfer resistance and CV on the electrochemical active area for the oxygen reduction reaction (ORR) showed optimum results in states that dielectric constant was 4.2. The results indicate that, under optimized conditions the (solvent dielectric constant of 4.2) exchange current density and Tafel slope are 9.8×10–5mA cm–2 and 66.0 mVdec–1, respectively. Examination of morphology of the prepared electrodes using SEM confirmed that the microstructure of the catalyst layer affected with different solvent dielectric constant.
PEMFC; Gas Diffusion Electrode; Catalyst layer; Oxygen Reduction Reaction; Dielectric Constant.<\div>

۵Multi Walled Carbon Nanotube supported Pt–doped CeO2 Nanoparticles as Catalyst for PEMFCs
اطلاعات انتشار: چهارمین همایش پیل سوختی ایران، سال
تعداد صفحات: ۹
Multi–walled carbon nanotube –supported Pt–doped CeO2 nanoparticles were synthesized in an electrodeposition bath containing constant concentrations of H2PtCl6 and different concentrations of CeO2. The electrocatalytic activities of catalysts were studied in 0.5 M H2SO4 for oxygen reduction reaction for proton exchange membrane fuel cells (PEMFCs) by cyclic voltammetry, rotating disk electrode voltammetry, chronopotentiometry and chronoamperometry. The CeO2 containing electrocatalysts show improved electrochemical performances. The optimum results are in states that CeO2 concentration in electrodeposition bath is 10 mM. XRD analyze give additional information on the morphological structure of electrocatalysts.<\div>

۶Borohydride Synthesis of the PtFeCo\Gr Electrocatalysts for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cells
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۵
Insufficient catalytic activity and durability are the most challenging issues in the commercialization of proton exchange membrane fuel cells. In an effort to address these barriers, PtFeCo\Gr electrocatalyst were prepared via the reduction of precursors in the presence of glycerol as stabilizer. The electrocatalytic performances of the synthesized PtFeCo\Gr alloy electrocatalysts were compared with that of PtFeCo\Gr electrocatalyst which prepared in the absence of glycerol. Physical property studies (XRD) and electrochemical analyses with catalyst layers immobilized on glassy carbon electrodes and electrochemical behavior of the synthesized electrocatalyst. Finally, a cell performance investigation, using the synthesized electrocatalyst was carried out in a single PEMFC setup.Among these electroctalysts, the PtFeCo\G–A catalyst exhibits the highest activity, a better behavior was obtained for the PtFeCo\G–A and the maximum power density produced from proton exchange membrane fuel cell with PtFeCo\G–A electrocatalyst which was prepared in the presence of glycerol as stabilizer was 9% higher than PtFeCo\G–B which was prepared in the absence of glycerol.<\div>

۷Glycerol stabilized Borohydride Synthesis of Supported Pt Alloy Nanoparticles Electrocatalysts for Oxygen Reduction Reaction in PEMFCs
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۶
This paper reports the synthesis of platinum–iron–cobalt alloy nanoparticles dispersed on graphene nanosheets. The particles had large electrochemical surface area. The synthesized electrocatalyst were used in the cathode of a proton membrane exchange fuel cell, in which the maximum power density is 330 mW cm–2 with 0.1 mg cm–2 Pt loading. Electrocatalyst were prepared via the reduction of precursors in the presence of glycerol as stabilizer. The electrocatalytic performances of the synthesized PtFeCo\Gr alloy electrocatalysts were compared with that of PtFeCo\Gr electrocatalyst which prepared in the absence of glycerol. Physical property studies (SEM, TEM micrographs) and electrochemical analyses with catalyst layers immobilized on glassy carbon electrodes (cyclic voltammetry) were carried out to characterize the structural and electrochemical behavior of the synthesized electrocatalyst. Finally, a cell performance investigation, using the synthesized electrocatalyst was carried out in a single PEMFC setup.The electrocatalytic performances of the synthesized electrocatalysts were compared with Pt\Gr by cyclic voltammetry; among these electroctalysts, the catalyst which was prepared in the presence of glycerol as stabilizer exhibits the highest activity and the best stability for oxygen reduction reaction (ORR) in acidic media.<\div>

۸Synthesis of Supported Pt Alloy three Dimensional Rhombus Shapes Nanoparticles for Oxygen Reduction Reaction
اطلاعات انتشار: Iranian Journal of Hydrogen and Fuel Cell، دوم،شماره۲، ۲۰۱۵، سال
تعداد صفحات: ۱۰
In this study PtFeCo ternary alloys nanoparticles of three dimentional (3D) rhombus shapes dispersed on graphene nanosheets (PtFeCo\Gr) were successfully prepared and studied as electrocatalysts for oxygen reduction reaction (ORR) in polymer–electrolyte fuel cells. A combination of analytical techniques including powder X–ray diffraction, X–ray photoelectron spectra, inductively coupled plasma–atomic emission spectrometry, scanning electron microscopy and electrochemical methods have been used for characterization of the synthesized electrocatalysts in this study. For comparison, the graphene supported PtFe catalyst (PtFe\Gr), graphene supported PtCo catalyst (PtCo\Gr) binary alloys and graphene supported Pt catalyst (Pt\Gr) were also synthesized and investigated under the same experimental conditions. From the electrochemical analysis, it is found that PtFeCo\Gr particles exhibited an obvious enhancement of ORR activity in comparison with pure Pt and binary alloys. The significantly improved EAS, ORR activity and cell performance is achieved by increasing the utilization of PtCoFe\Gr electrocatalyst by increasing the three–phase boundary in the electrocatalyst layer.
نمایش نتایج ۱ تا ۸ از میان ۸ نتیجه