研究生: |
潘怡宣 Pan, Yi Hsuan |
---|---|
論文名稱: |
多孔聚丙烯腈/奈米碳管複合材之電雙層結構研究 Study on electric double layer structure of porous PAN/carbon nanotubes composites |
指導教授: |
徐文光
Hsu, Wen Kuang |
口試委員: |
呂昇益
林樹均 |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 65 |
中文關鍵詞: | 超級電容 、電雙層 |
相關次數: | 點閱:2 下載:0 |
分享至: |
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超級電容的性能取決於電極材料的選擇,碳材料具備易取得、低成本、高比表面積等優勢,因此廣泛使用於電雙層電容電極材料。聚丙烯腈是製造碳纖維的主要材料,本研究利用聚丙烯腈加入氯化鋰得到多孔性薄膜,高溫碳化後得到多孔性碳粉製成電極。此外,製程加入奈米碳管所得電極作為對照組,研究碳管對電容的影響。電極的表面形貌及結構組成經由X光繞射儀、拉曼光譜儀、場發射掃描式電子顯微鏡、霍氏轉換紅外光譜儀和高解析比表面積分析儀得到資訊。電極的電性、電容特性及電化學性質透過Van Der Pauw 四點量測、循環伏安法與阻抗分析,得到電阻率、比電容、倍率性能、充放電循環壽命及系統阻抗。本研究顯示,聚丙烯腈加入50%氯化鋰以及碳化溫度900℃得到多孔粉末所製成的電極擁有最佳比表面積和比電容值,此外加入適當濃度的奈米碳管可以提升電極比電容值。
The performance of supercapacitors depends on the selection of electrode materials. Carbon materials are widely used in the electrode of electrochemical double-layer capacitor (EDLC), because of its availability, low cost and high surface area. Polyacrylonitrile (PAN) is the primary source used to produce carbon fibers which possess above advantages and thus has a potential to be a candidate for supercapacitors. In this study, lithium chloride (LiCl) is mixed with PAN to create porous film, followed by carbonization to form porous carbon as the electrode. Additionally, carbon nanotubes (CNTs) are added into LiCl/PAN to form additional electrode for a comparison. The morphology and structure of electrodes are characterized by X-ray diffraction (XRD), Raman measurement, field emission scanning electron microscopy (FE-SEM), fourier-transform infrared spectrometer (FTIR) and high-resolution surface area and porosimetry analyser. The electrical and electrochemical properties of electrodes, including resistivity, capacitance, rate capability, and cycle life, are studied by van der pauw method, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) in Autolab. Results indicate that the porous electrodes which are made with 50% LiCl in PAN and carbonized at 900℃show the highest surface area and capacitance. Moreover, addition of a certain amount of CNTs into electrodes may promote capacitance.
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