کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288327 1498029 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Facile synthesis of hollow spherical sandwich PtPd/C catalyst by electrostatic self-assembly in polyol solution for methanol electrooxidation
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Facile synthesis of hollow spherical sandwich PtPd/C catalyst by electrostatic self-assembly in polyol solution for methanol electrooxidation
چکیده انگلیسی

A novel PtPd/C catalyst with hollow spherical structure has been successfully prepared by electrostatic self-assembly one-step reductive route using sodium dodecyl sulfate as a capping and structure-directing agent in ethylene glycol solution by microwave-assisted process. The structure, composition, and morphology of as-prepared catalyst are characterized by X-ray diffraction, energy dispersive analysis of X-ray, scanning electron microscope, and transmission electron micrograph, respectively. The as-prepared PtPd/C catalyst has a novel hollow spherical sandwich structure with open porosity and integrity, which can prevent Pd metal from oxidation and dissolution, and enhance electrocatalytic activity and stability toward methanol electrooxidation in comparison with the solid solution PtPd/C alloy and Pt/C catalysts. The results of electrochemical measurement demonstrate the enhancement of the CO-tolerant ability of hollow spherical PtPd/C catalyst by the new insight into the mechanism that Pd can efficiently directly oxidize the poisoning intermediates from methanol electrooxidation, such as HCOOH, to CO2, which promotes its catalytic efficiency and results in much higher electrocatalytic activity than Pt/C on a mass basis. Therefore, the effective and facile method to prepare PtPd/C catalyst with hollow spherical sandwich and porous structure and better catalytic performance is very important and desirable in direct methanol fuel cell applications.

PtPd/C catalyst with hollow spherical sandwich structure was successfully prepared by electrostatic self-assembly one-step reductive route using sodium dodecyl sulfate as the capping and structure-directing agent in ethylene glycol solution by microwave-assisted process. It can prevent Pd metal from oxidation and dissolution, and enhance its stability and activity toward methanol electrooxidation.Figure optionsDownload as PowerPoint slideHighlights
► The hollow spherical sandwich structure with open porosity and integrity was successfully synthesized by electrostatic self-assembly route.
► The high activity and stability of hollow spherical PtPd/C catalyst for methanol electrooxidation were obtained.
► The new mechanism of methanol oxidation on the hollow spherical PtPd/C catalyst was proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 203, 1 April 2012, Pages 17–25
نویسندگان
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