کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1290499 973328 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface structure and electronic properties of Pt–Fe/C nanocatalysts and their relation with catalytic activity for oxygen reduction
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Surface structure and electronic properties of Pt–Fe/C nanocatalysts and their relation with catalytic activity for oxygen reduction
چکیده انگلیسی

In this work, physical and catalytic properties of Pt–Fe/C nanocatalysts of nominal compositions Pt:Fe 70:30 and 50:50, prepared by a polyol process using a long-chain diol as reducer (hexadecanediol) and oleic acid and oleylamine as stabilizers, are reported. As-prepared materials have very small particle size (2.2 nm), narrow particle size distribution, and homogeneous dispersion on the carbon support. The average compositions determined by energy dispersive X-ray analysis are Pt75Fe25/C and Pt60Fe40/C. Data for samples submitted to heat treatment in hydrogen atmosphere to induce Pt surface segregation are also presented. X-ray diffraction and transmission electronic microscopy are used to examine all as-prepared and heat-treated catalysts. Electronic properties are analyzed based on in situ dispersive X-ray absorption spectroscopy data. Measurements of electrocatalytic activity for oxygen reduction show that all Pt–Fe/C have electrocatalytic activities superior to that of Pt/C. Nanocatalysts with a Pt-rich surface have an enhanced performance for the reduction of oxygen but measurements carried out in methanol containing solutions show that Pt-enriched surfaces have an inferior methanol tolerance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 195, Issue 10, 15 May 2010, Pages 3111–3118
نویسندگان
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