Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3075
標題: 合成高分散鉑鈷奈米粒子擔持在石墨烯於直接甲醇燃料電池之應用
Synthesis of Highly Dispersed Pt-Co Nanoparticles on Graphene Sheets for Methanol Oxidation Fuel Cell Application
作者: 吳仕揚
Wu, Shih-Yang
關鍵字: 石墨烯;Graphene;多元醇還原法;直接甲醇燃料電池;Polyol method;DMFC
出版社: 化學工程學系所
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摘要: 
本研究主要是採用化學還原法中的多元醇還原法,並利用石墨烯做為雙金屬觸媒的載體,其中製備石墨烯的方法是採用Hummers method先製備出氧化石墨烯,再將氧化石墨稀與鉑、鈷雙金屬前驅物溶於乙二醇中,以PVP做為金屬保護劑,在180℃下進行3小時的還原反應,以製備出鉑、鈷雙金屬觸媒擔持在石墨烯表面。先以10 wt%鉑、鈷雙金屬觸媒且莫耳比為1:1擔持於石墨烯表面上,並探討PVP與金屬重量比R值的影響,經由電化學分析過後的結果發現在R=0.9且鉑、鈷雙金屬莫耳比為1:1具有最好的抗毒化效果。同時在R=0.9下,探討了擔持量(5wt%~20wt%)和鉑、鈷雙金屬莫耳比的影響。最後透過TEM、XRD、TGA、EDS、XPS和電化學分析來探討雙金屬觸媒擔持在石墨烯表面的分散性、晶相結構、金屬含量、甲醇氧化電流密度與抗毒化程度。
經由XRD的檢測後,發現擔持在石墨烯上的鉑、鈷雙金屬觸媒型態並非雙合金結構,由TGA和EDS分析結果發現擔持於石墨烯表面的鉑、鈷雙金屬量和原子比會因雙金屬競爭效應的關係而有所不同,最後根據循環伏安分析法判斷甲醇的催化活性與雙金屬觸媒的抗毒化程度。由結果可以發現在R=0.9,雙金屬莫耳比為1:1且總重量達15wt%擔持於石墨烯表面上的鉑、鈷雙金屬觸媒擁有最高的甲醇氧化波峰電流密度46mA/cm2,和較佳的抗毒化程度(If/Ib=1.89)。

This study has used Polyol reduction method to prepare highly-dispersed bi-metallic supported on Grnphene catalysts. The Graphene oxide was first prepared by using Hummers method, then the synthsized Graphene oxide and bi-metallic precursors were placed into ethylene glycol solution, and added PVP as the metallic protecting agent. The solution was heated to 180℃ for 3 hours to form Pt-Co bi-metallic catalysts supported on Graphene surface. The 10 wt% Pt-Co bi-metallic catalyst and the molar ratio of 1:1 supported on grapheme has been investigated to determine the effect of R, which is the ratio of PVP weight to total weight of bi-metallic in the catalyst, on the chemical properties of these catalysts. Discussed the effect of supporting amount (5wt% ~ 20wt%) and the Pt-Co molar ratio with R=0.9. The electrochemical analysis results have revealed that with R=0.9 and the molar ratio of 1:1 of Pt to Co has the best antitoxic capbility. Finally, through TEM, XRD, TGA, EDS, XPS, and electrochemical analysis to further determine the dispersibility、crystalline phase structure、metal content、methanol oxidation current density and antitoxic degree on the bi-metallic supported on Graphene catalysts.
The XRD detection results have found that Pt-Co bi-metallic catalyst supported on Graphene does not form metal alloy, and through the detection of TGA and EDS has indicated that the competitive effect of the bi-metallic results in the difference of weight and molar ratio of the Pt-Co bi-metallic supported on Graphene surface. Finally, the analysis of the cyclic voltammetry method has determined the catalytic activity of methanol and antitoxic degree of these catalysts. The results have found that the Pt-Co bi-metallic with R=0.9 and the atomic ratio 1:1 and total weight of Pt-Co at 15 wt% on Graphene surface possesses the highest peak current density of methanol oxidation of 46 mA/cm2, and antitoxic degree of If / Ib = 1.89, respectively.
URI: http://hdl.handle.net/11455/3075
其他識別: U0005-2901201314430900
Appears in Collections:化學工程學系所

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