發(fā)布時間：2018-01-10 08:12

  本文關鍵詞：基于二氧化錳和碳基材料的復合電容材料制備及性能研究　出處：《西北師范大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 碳納米管 碳纖維 超級電容器 異質結 二氧化錳 電紡技術

【摘要】：超級電容器是一種近年來得到廣泛研究的儲存電能的器件,對其研究主要集中在電極材料的選取和制備。碳納米材料、金屬性活潑的氧化物、具有優(yōu)秀導電性的聚合物和由它們構成的復合物是高性能電容器的重要電極原料。獲得高效的復合電極原料是目前電容器研究的核心,本論文是將制備的三維自支撐碳納米管/碳纖維異質復合結構與二氧化錳結合形成復合材料,并將該復合材料用于自支撐超級電容器的電極材料,經過測試儀器的試驗發(fā)現(xiàn)該電極原料擁有優(yōu)異的電容效應。另外,并用該電極材料組裝對稱的超級電容器,通過實驗測試發(fā)現(xiàn)該對稱電容器具有很好的柔韌性和穩(wěn)定性。本論文中,首先利用電紡技術制得摻雜乙酰丙酮鐵的聚丙烯腈納米纖維,再將所得到的納米纖維碳化得到碳纖維。最后以碳纖維為基底、乙酰丙酮鐵為催化劑,在800℃的反應溫度下,使用CVD方法獲得自支撐的CNTs/CNF。所制備的碳纖維/碳納米管具有高的導電率(1250 S/cm)、大的比表面積和優(yōu)異的柔韌性。在中性的高錳酸鉀溶液中反應0.5h的CNTs/CNF并獲得CNTs/CNF/MnO2,通過計算CNTs/CNF/MnO2復合電極材料在掃描速率是5 mVs-1時的比容量高達517 Fg-1,另外用GCD方法測試比電容1000次后仍保留初始值的75%,即表現(xiàn)出優(yōu)秀的電容重復性。通過對比實驗并測試可以發(fā)現(xiàn)在具有相同活性質量的CNTs/CNF/MnO2復合電極材料的電化學性能遠遠優(yōu)于CNF/MnO2復合電極材料。最終,使用兩片CNTs/CNF/MnO2復合電極原料構造了對稱的高性能電容器,該對稱的高性能電容器在功率密度是7000 W/kg時,獲得最大能量密度值3.88 Wh/kg。將組裝的超級電容器彎曲100次后其電容仍保持在初始值的70%。通過對比實驗數(shù)據(jù)可以發(fā)現(xiàn)我們設計的這種異質結構可以增強電極材料的電化學性能,同時也能夠認為這類自支撐CNTs/CNF/MnO2異質復合原料在柔性高性能電容器中擁有很大的發(fā)展?jié)摿Α?br/>[Abstract]:Supercapacitor is a widely studied device for storing electrical energy in recent years. The research focuses on the selection and preparation of electrode materials carbon nanomaterials and active oxides with gold properties. Polymers with excellent conductivity and their composites are important electrode materials for high performance capacitors. The core of capacitor research is to obtain high efficiency composite electrode materials. In this thesis, the 3D self-supporting carbon nanotube / carbon fiber heterocomposite structure is combined with manganese dioxide to form the composite, and the composite is used as the electrode material of self-supporting supercapacitor. It is found that the electrode material has excellent capacitance effect. In addition, a symmetrical supercapacitor is assembled with the electrode material. The experimental results show that the symmetric capacitor has good flexibility and stability. In this thesis, the polyacrylonitrile nanofibers doped with acetylacetone iron were prepared by electrospinning technology. Carbon fiber was obtained by carbonization of the obtained nanofibers. Finally, the reaction temperature was 800 鈩，

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