探討二元觸媒(Pt-Ru)應用電弧電漿法合成奈米碳管之製程研究; Carbon nanotubes produced by arc discharge with bimetallic catalyst (Pt-Ru)

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题名:	探討二元觸媒(Pt-Ru)應用電弧電漿法合成奈米碳管之製程研究;Carbon nanotubes produced by arc discharge with bimetallic catalyst (Pt-Ru)
作者:	劉宏仁;Hong-Jen Liu
贡献者:	機械工程研究所
关键词:	直接甲醇燃料電池;奈米碳管;拉曼光譜儀;Direct Methanol Fuel Cell;Carbon Nanotube;Raman Spectra
日期:	2004-01-07
上传时间:	2009-09-21 11:43:39 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文是藉由Pt或Pt-Ru做為電弧電漿法合成奈米碳管的觸媒，並期望合成的奈米碳管中含有Pt或Pt-Ru的觸媒，可以直接供給直接甲醇型燃料電池使用。並探討改變操作電流、觸媒比例及成份等不同的實驗參數影響下，觀察其合成的效果。本實驗中，主要使用SEM對陰極沈積物中做初步的分析，觀察奈米碳管、非晶的碳及碳微粒生成的情況。再以TEM觀察，分析Pt或Pt-Ru觸媒分析的情況。最後，由拉曼光譜儀判斷碳管的特性。 Pt並不是Fe、Co及Ni為合成奈米碳管常用的觸媒，因此，實驗中，我們可以發現在一些參數中，雖然在陰極的石墨棒中有沈積物，但經SEM的觀察後，卻發現無奈米碳管生成，但在操作電流為150A下，皆可發現奈米碳管。使用Pt-Ru的二元觸媒，在所有實驗的參數中，陰極石墨棒的沈積物，經由SEM的觀察，皆可發現奈米管的生成。因此，使用Pt-Ru的二元觸媒其合成的效果明顯優於Pt的觸媒。增加Pt或Pt-Ru的觸媒重量百分比，不但不會增加奈米碳管的產量，更經由SEM照片的觀察中，可發現產生許多的碳微粒和非晶的碳，我們可以由拉曼光譜的結果發現，非晶的碳愈多，D-Band的強度愈強，會明顯影響奈米碳管的品質。操作電流愈大，D-Band及G-Band愈往低頻移動，因此，奈米碳管的結構產生了改變。適當的操作電流對合成奈米碳管是十分重要的，操作電流太低，生長的速度慢，且非晶質的碳多，操作電流太高，容易發生短路的現像，並且石墨化的程度低，由實驗的結果可得最佳的操作電流約為100A。 In this study, we use Pt and Pt-Ru catalysts for the arc discharge method to synthesize carbon nanotube (CNT), hoping that there will be Pt or Pt-Ru catalysts on the carbon nanotube. So the products can be used in the direct methanol fuel cell directly. In the experiments, we changed the operating current, catalyst loading and the composition of the catalyst. The CNTs thus produced are characterized by SEM, TEM and Raman spectroscopy. SEM results are used to characterize the CNT formation and shape. TEM results are used to observe the catalyst on the CNTs. Raman spectra are used to characterize the purity of the CNTs. Pt is not as useful as Fe, Co, Ni in synthesizing carbon nanotube. In this work, we did not find CNTs in a few cases, especially when the synthesizing current is low. But with 150 A, we find CNTs in all cases. Also, if we use Pt-Ru instead of Pt, we can find CNTs in all cases. So Pt-Ru catalyst is more effective than Pt in catalyzing CNT formation. Increasing the loading of the Pt or Pt-Ru does not increase the CNT yield. According to the SEM results, we find more amorphous carbons and particles as the catalyst loading is increased. In the Raman spectra, we find the D-Band intensity is also increased, and therefore the value of IG/ID decreases. So the catalyst loading should not be too high. On the other hand, as the synthesizing current is increased, the D-Band and G-Band peaks move to lower frequencies. The micro structures of the Multiwalled carbon nanotubes may be different due to different energy inputs. Suitable operating current is very important to carbon nanotube. With low synthesizing current, there is more amorphous carbon and carbon particles. The value of IG/ID increases as the synthesizing current is increased from 80 A to 100 A, and then decreases as the synthesizing current is increased from 100 A to A.
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