کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
608225 880573 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics and mechanism of electrochemical oxygen reduction using Platinum/clay/Nafion catalyst layer for polymer electrolyte membrane fuel cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Kinetics and mechanism of electrochemical oxygen reduction using Platinum/clay/Nafion catalyst layer for polymer electrolyte membrane fuel cells
چکیده انگلیسی

This work demonstrates the use of amino functionalized Mg-phyllosilicate clay/Nafion nanocomposite film embedded with Pt nanoparticles (Pt/AC/N) for catalyzing oxygen reduction reaction (ORR) in sulphuric acid medium. Pt/AC/N nanocomposite films were surface characterized using transmission electron microscope. Cyclic and linear scan voltammetry studies were carried out under hydrodynamic conditions taking rotating-ring disc electrode (RRDE) as the working electrode. The effects of clay content, Pt mass loading, electrode rotation rate, and temperature on the ORR kinetics were studied. The Tafel slopes were found to vary between 118 and 126 mV dec−1 indicating a good ORR kinetics. The exchange current density values calculated after mass transfer correction ranged from 5.8 × 10−7 to 2.4 × 10−6 A cm−2. From the RRDE disc currents, Koutecky–Levich plots were constructed and the ORR mechanism was found to follow a four electron path with minimum H2O2 formation of ∼1.6%. The effect of temperature on ORR kinetics was found at 25, 40, and 50 °C. The energy of activation calculated to be 7.68 kJ mol−1 and comparable to the standard Pt/C catalyzed ORR systems.

Figure optionsDownload high-quality image (220 K)Download as PowerPoint slideHighlights
► A novel Pt NP embedded aminoclay/Nafion nanocomposite catalyst film prepared.
► Catalyst film used for oxygen reduction reaction (ORR) in acid medium.
► Optimization of components based on ORR activity.
► Maximum current density of 4.2 mA cm−2 was obtained for optimized composition.
► Percentage of H2O2 intermediate calculated from ‘rotating ring disc electrode’ results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 387, Issue 1, 1 December 2012, Pages 213–220
نویسندگان
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