聚丙烯腈奈米纖維材料表面活化及 碳化製備高電容超級電容器電極之研究

Surface Activation and Carbonization of Polyacrylonitrile Nanofiber for High Capacity Supercapacitors

韓姿嫻(tzu-hsien Han)

指導教授 ： 陳玉惠

中原大學/理學院/化學研究所/碩士(2011年)

https://doi.org/10.6840/cycu201101104

摘要

本研究使用放電紡絲技術製作聚丙烯腈(PAN)奈米纖維，PAN纖維因其高度順向性、高熔點以及超過45 %的高碳產率(Carbon yield)，經低溫預熱處理之下PAN纖維會具較佳熱穩定性，形成高順向梯狀結構，碳化中分子鏈並不會因為高熱裂解形成斷鏈，可生產出具有高性能的碳纖維。
研究中針對聚丙烯腈電紡不織布熱劣解性質進行分析，氧化溫度設定為280 °C，於不同氧化時間(80, 65, 50 分鐘)下測得氧化重量損失率介於5.9 ~ 9.3 %；密度介於1.37 ~ 1.47 g/cm3。於不同氧化條件所得之PAN纖維經由X-ray繞射結構分析結果顯示，氧化之環化指數(A.I.值)可達55.7 ~ 68.2%。聚丙烯腈電紡不織布經由高溫活化，活性碳纖維之比表面積大致上仍隨著活化溫度與活化時間增加而提升，於1000 °C活化5分鐘出現最大比表面積值，1006.8 m2/g。比電容量測試結果顯示，隨著活化時間的增加比電容量隨之提升，以1000 °C下活化5分鐘得之不織布在掃描速率6 mV/sec測得最高比電容量，543.3(F/g)。

關鍵字

放電紡絲 ； 聚丙烯? ； 奈米纖維

並列摘要

The research reports a simple, low temperature method to increase the performance of Polyacrylonitrile (PAN) nanofiber. PAN were first pre-treated with low temperature procedure, and then manufactured through electro-spinning technology to yield high performance nanofibers. The nanofiber displayed great enhancement on the ladder-shaped orientations, high thermal stabilities without fiber breaking at high temperature and high carbon yield (over 45 %). Also investigated were the PAN nanofiber properties, such as thermal properties, surface structure, electrochemical of super capacitor and surface morphology by TGA-DSC, XRD, Cyclic Voltammetry and FE-SEM. The results exhibited that the best oxidation temperature in oxygen was 280oC. With various oxidation times between 50min-80min, the weight losses were between 5.0 - 9.3 % and the densities were between 1.37 - 1.47 g/cm3. The Aromatization Index (A. I.) obtained were up to 55.7 - 68.2 %. Experimental results also demonstrated a maximum specific capacitance of 543.3 F/g from the nanofiber obtained at 1000°C for 5 min with a specific surface area of 1006.8 m2/g.

並列關鍵字

Polyacrylonitrile ； electro-spinning ； nanofiber

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