研究生: |
王家偉 Wang, Chia-Wei |
---|---|
論文名稱: |
陽極複合沉積釕系氧化物電極材料於超級電容器之應用 Anodic Composite Deposition of Ruthenium Oxide-Based Electrode Materials for Supercapacitors |
指導教授: |
胡啟章
Hu, Chi-Chang |
口試委員: |
馬振基
胡啟章 鄧熙聖 董瑞安 曾堯宣 |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 142 |
中文關鍵詞: | 超級電容器 、複合電鍍 、釕氧化物 |
相關次數: | 點閱:2 下載:0 |
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本研究探討利用陽極複合沉積法製備釕氧化物-鈦氧化物複合電極以及釕氧化物-石墨烯/奈米碳管複合電極於超級電容器之應用。經由改變成長溫度與複合鍍液組成比例對釕氧化物-鈦氧化物複合電極作系統性的研究;並先以微波輔助水熱法(microwave-assisted hydrothermal elimination method)製備還原程度不同之石墨烯來探討陽極複合沉積上機制的差異後,選擇添加高孔洞結構、高比表面積之石墨烯/奈米碳管,來觀察材料以及電化學上的特性。在材料分析方面,經由掃描式電子顯微鏡(scanning electron microscopy,SEM)來觀察表面型態、能量散射光譜儀(Energy Dispersive Spectrometer,EDS)分析組成、拉曼光譜(Raman spectroscopy)作定性分析、X光繞射儀(X-ray diffraction,XRD)觀察其結構上的變化、穿透式電子顯微鏡(transmission electron microscopy,TEM)分析其微結構以及利用熱分析儀(Thermogravimetric analysis, TGA)研究複合電極之重量損失與其水含量。經由循環伏安行為、可逆性測試以及不同掃描速率之影響來觀察其電化學的特性。
首先發現加入鈦氧化物於鍍液中,並不會影響釕氧化物的沉積行為。當成長溫度在35 oC時,釕氧化物成長速率非常慢且不連續;而當成長溫度於65 oC 時,會因釕氧化物成長太快而有氧化物的掉落,故以50 oC為氧化物最佳的成長溫度。接著由電極剖面(cross section) EDS分析結果發現,可藉由改變溶液組成進而控制複合氧化物中鈦氧化物含量;且皆具有粗糙的表面型態,符合熱分析儀結果。隨著鍍層中鈦氧化物含量的增加,整體比電容呈現逐漸下降的趨勢,當鈦氧化物含量為23 wt%時,電極整體電容量可達最大值約500 F/g;又當鈦氧化物含量為36 wt%時,可達最高釕氧化物的利用率為773 F/g。
之後添加0.9 g/L的石墨烯/奈米碳管溶液於鍍液中,同樣利用陽極複合沉積法製備釕氧化物-石墨烯/奈米碳管電極。其表面形態為不規則3D片狀排列之蓬鬆結構,由元素分佈分析得知,釕氧化物與石墨烯/奈米碳管是整體性且連續性的沉積。此外,以TEM確定此複合材料具有奈米等級的混合程度;最後以TGA間接推斷其結構具高度孔洞性。經熱處理效應之電化學分析,得知以150 oC為熱處理溫度時釕氧化物-石墨烯/奈米碳管電極具最理想之電容行為,其比電容值達973 Fg-1,且其掃描速率與峰電流呈線性關係,而電容保持率為最高約為60.5%。故釕氧化物-石墨烯/奈米碳管電極經150 oC熱處理 2小時後可達最佳之儲能性質,比能量密度與比功率密度分別達144.6 Whkg-1與157.5 kWkg-1。
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