本文關(guān)鍵詞：基于二氧化錳和碳基材料的復(fù)合電容材料制備及性能研究　出處：《西北師范大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 碳納米管 碳纖維 超級(jí)電容器 異質(zhì)結(jié) 二氧化錳 電紡技術(shù)

【摘要】：超級(jí)電容器是一種近年來(lái)得到廣泛研究的儲(chǔ)存電能的器件,對(duì)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(dǎo)電性的聚合物和由它們構(gòu)成的復(fù)合物是高性能電容器的重要電極原料。獲得高效的復(fù)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(zhì)復(fù)合結(jié)構(gòu)與二氧化錳結(jié)合形成復(fù)合材料,并將該復(fù)合材料用于自支撐超級(jí)電容器的電極材料,經(jīng)過(guò)測(cè)試儀器的試驗(yàn)發(fā)現(xiàn)該電極原料擁有優(yōu)異的電容效應(yīng)。另外,并用該電極材料組裝對(duì)稱(chēng)的超級(jí)電容器,通過(guò)實(shí)驗(yàn)測(cè)試發(fā)現(xiàn)該對(duì)稱(chēng)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(shù)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(yīng)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(dǎo)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(yīng)0.5h的CNTs/CNF并獲得CNTs/CNF/MnO2,通過(guò)計(jì)算CNTs/CNF/MnO2復(fù)合電極材料在掃描速率是5 mVs-1時(shí)的比容量高達(dá)517 Fg-1,另外用GCD方法測(cè)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(fù)性。通過(guò)對(duì)比實(shí)驗(yàn)并測(cè)試可以發(fā)現(xiàn)在具有相同活性質(zhì)量的CNTs/CNF/MnO2復(fù)合電極材料的電化學(xué)性能遠(yuǎn)遠(yuǎn)優(yōu)于CNF/MnO2復(fù)合電極材料。最終,使用兩片CNTs/CNF/MnO2復(fù)合電極原料構(gòu)造了對(duì)稱(chēng)的高性能電容器,該對(duì)稱(chēng)的高性能電容器在功率密度是7000 W/kg時(shí),獲得最大能量密度值3.88 Wh/kg。將組裝的超級(jí)電容器彎曲100次后其電容仍保持在初始值的70%。通過(guò)對(duì)比實(shí)驗(yàn)數(shù)據(jù)可以發(fā)現(xiàn)我們?cè)O(shè)計(jì)的這種異質(zhì)結(jié)構(gòu)可以增強(qiáng)電極材料的電化學(xué)性能,同時(shí)也能夠認(rèn)為這類(lèi)自支撐CNTs/CNF/MnO2異質(zhì)復(fù)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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