本文關(guān)鍵詞：錳氧化物基超級電容器電極材料的制備及性能研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超級電容器 石墨烯 炭黑 錳氧化物 電極材料

【摘要】：近些年來,超級電容器因為其諸多優(yōu)勢而逐漸受到越來越多的研究人員的關(guān)注,很多人都將其視為一種很具潛力的電化學(xué)儲能設(shè)備。在目前研究中,碳基材料與過渡金屬氧化物的復(fù)合材料因為其資源豐富、價格低廉和環(huán)境友好以及良好的電化學(xué)性能而成為研究熱點。但是石墨烯材料的制備成為了該項研究的癥結(jié)所在,這是因為石墨烯材料在還原的過程中容易發(fā)生團聚而使得所制得的材料喪失了石墨烯的優(yōu)異性能。在本課題研究中,我們采用一定的方法來抑制石墨烯的團聚,在隨后的過程中將所制得的石墨烯基材料與錳氧化物復(fù)合,并測試復(fù)合材料的電化學(xué)性能。通過在氧化石墨烯還原之前加入炭黑的方法,制得石墨烯-炭黑復(fù)合材料。通過對該材料進行SEM形貌和拉曼表征,對比氧化石墨烯還原之前加入炭黑和氧化石墨烯還原之后加入炭黑所制得的樣品,發(fā)現(xiàn)炭黑的添加一定要在氧化石墨烯的還原之前進行,否則即便加入還原之后加入炭黑也很得到炭黑阻止石墨烯團聚的效果。而且炭黑的最佳添加比例為氧化石墨:炭黑=10:1。在KMnO_4與石墨烯-炭黑復(fù)合材料中碳原子反應(yīng)制備的電極材料中,反應(yīng)溫度為120℃,KMnO_4與石墨烯-炭黑復(fù)合材料的添加量分別為50 mg和110 mg時制備得到的樣品比電容最大,在電流密度為1 A/g和0.5 A/g時分別可以達到118F/g和146.7 F/g。該反應(yīng)在120℃和150℃下不僅會生成Mn_3O_4,也會生成雜質(zhì)相MnOOH和MnCO_3。并且隨著KMnO_4濃度的增加,Mn_3O_4會逐漸發(fā)生團聚現(xiàn)象,這樣會導(dǎo)致比電容的下降。在KMnO_4與乙二醇反應(yīng)制備Mn_3O_4的樣品中,最大比電容在電流密度為1A/g和0.5 A/g時分別僅為62.1 F/g和77.9 F/g。單純Mn_3O_4由于其電導(dǎo)率低下,并不能使Mn_3O_4完全發(fā)揮其優(yōu)良的贗電容特性。由于石墨烯-炭黑復(fù)合材料的存在,一方面提高了Mn_3O_4的電導(dǎo)率,另一方面使得Mn_3O_4結(jié)構(gòu)細化,增加其與電解液的接觸面積,進而增大比電容。但是隨著石墨烯-炭黑復(fù)合材料的加入,反應(yīng)中也會生成一定的雜質(zhì)相。綜合比較兩種不同的制備方法易知,KMnO_4與石墨烯-炭黑復(fù)合材料反應(yīng)的原位生長法是一種更加合理且具有實用意義的方法。
[Abstract]:In recent years, supercapacitors have attracted more and more attention from researchers because of their many advantages. Many people regard supercapacitors as a potential electrochemical energy storage equipment. Carbon based composites with transition metal oxides are rich in resources. Low cost, environment-friendly and good electrochemical performance have become the focus of research, but the preparation of graphene materials has become the crux of the study. This is because graphene materials are prone to agglomeration in the process of reduction, which results in the loss of the excellent performance of graphene. In this study, we used certain methods to suppress the agglomeration of graphene. In the subsequent process, the graphene based materials were compounded with manganese oxides, and the electrochemical properties of the composites were tested by adding carbon black before the reduction of graphene oxide. The graphene carbon black composites were prepared. The SEM morphology and Raman characterization were used to compare the samples prepared by adding carbon black and graphene oxide before reduction and adding carbon black after reduction of graphene oxide. It was found that the addition of carbon black must be carried out before the reduction of graphene oxide. Otherwise, the effect of carbon black on the agglomeration of graphene was obtained even after adding carbon black after reduction. The best addition ratio of carbon black is graphite oxide: carbon black 10:. 1. In the electrode material prepared by the reaction of KMnO_4 with carbon atom in graphene carbon black composite. The maximum specific capacitance was obtained when the reaction temperature was 120 鈩，

本文編號：1415812