Study of Atomic Structure and Composition of intermetallic Pt3Co Nanoparticles on MWCNT in Enhanced Elrctroactivity of Methanol Oxidation
- سال انتشار: 1394
- محل انتشار: یازدهمین سمینار سالانه الکتروشیمی ایران
- کد COI اختصاصی: ELECTROCHEMISTRY011_040
- زبان مقاله: انگلیسی
- تعداد مشاهده: 516
نویسندگان
Department of Chemistry , Islamic Azad University Shahr Qods Branch, Tehran, Iran
Department of Chemistry , Islamic Azad University Shahr Qods Branch, Tehran, Iran
چکیده
Pt and Pt–Co supported on MWCNTs were synthesized by the impregnation method to enhance and optimize nanocatalyst performance and durability for the methanol oxidation reaction in fuel-cellapplications, Pt–metal disordered alloys and describe a new class of Pt–Co nanocatalysts composed of ordered Pt3Co intermetallic with atomic-layer in platinum crystal lattic. The particle size, morphology and chemical composition of Pt3Co/MWCNTs was characterized by XRD and SEM. Itwas found that the PtCo/MWCNTs catalyst exhibited a fcc nanostructure. A homogeneous distribution of Pt–Co nanodeposits with particle size of 7-12 nm was attained in SEM images at Pt3Co/MWCNTs powder. EDX analysis confirmed the reduction of Co in Pt3Co/MWCNTs electrocatalyst. These nanocatalysts exhibited increase electroactivity when compared with thedisordered Pt/MWCNT nanoparticles as well as Pt/C. So far, this activity for the methanol oxidation reaction is the highest among the Pt–Co systems reported in the literature under similar testing conditions. The high activity and stability are attributed to the Pt-rich shell and the stable intermetallic Pt3Co core arrangement. These ordered nanoparticles provide a new direction for catalyst performance optimization for next-generation fuel cells.کلیدواژه ها
Platinum–cobalt , Methanol oxidation , Fuel cells, MWCNTs, Electrocatalystمقالات مرتبط جدید
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