کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1694613 1519074 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Physicochemical characterization of amino functionalized synthetic clay/Nafion nanocomposite film with embedded platinum nanoparticles for PEM fuel cells
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Physicochemical characterization of amino functionalized synthetic clay/Nafion nanocomposite film with embedded platinum nanoparticles for PEM fuel cells
چکیده انگلیسی


• Aminoclay/Nafion nanocomposite film was prepared by a simple solution cast method.
• The composition was optimized based on thermal and mechanical stabilities and proton conductivity.
• The optimized nanocomposite film with embedded Pt nps found to possess a good catalytic activity towards ORR in acid medium.

A novel aminopropyl functional group bearing magnesium phyllosilicate clay (AC)/Nafion nanocomposite films with embedded platinum nanoparticles (Pt/AC/N) was prepared by sol–gel method followed by solution casting for various compositions of AC in Nafion. The as prepared nanocomposite films were subjected to surface characterization by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The thermal and mechanical stabilities were analyzed by thermogravimetric analysis (TGA) and nanoindentation coupled scanning probe microscopy analysis (SPM). The protonic conductivity of AC/Nafion nanocomposite films with and without Pt nanoparticles was measured by electrochemical impedance spectroscopy (EIS) using a two-probe conductivity cell. It was found that 6 wt.% AC/Nafion possesses a high proton conductivity of 1.38 × 10− 4 S cm− 1, a thermal stability of up to 360 °C (60 °C higher than pristine Nafion) and a high mechanical stability (78.76 MPa) among the different compositions studied. The catalytic activity of the optimized nanocomposite film containing Pt nanoparticles (Pt/6 wt.% AC/N) towards oxygen reduction reaction (ORR) was investigated by cyclic voltammetry (CV) and linear scan voltammetry (LSV) techniques under hydrodynamic conditions. It was observed that 35.4 μg cm− 2 Pt/6 wt.% AC/N composite film has higher ORR limiting current density of 4.2 mA cm− 2, and also it is interesting to note that this composition exhibited a high conductivity of 1.75 × 10− 3 S cm− 1 indicating that the nanocomposite catalyst film could be used as a proton conductor as well as a catalyst layer for the fabrication of membrane electrode assemblies in PEM fuel cells.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 104, February 2015, Pages 66–73
نویسندگان
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