發(fā)布時間：2018-01-22 07:09

  本文關鍵詞： 二硫化鉬 聚苯胺 石墨烯 碳納米管 碳氣凝膠 超級電容器 納米復合材料　出處：《信陽師范學院》2014年碩士論文　論文類型：學位論文

【摘要】：能源危機已經(jīng)成為全球性的問題并引起了廣泛的關注,探索具有優(yōu)越性能的新材料來解決能源問題已經(jīng)成為科學家們最重要的使命之一。超級電容器作為一種新型儲能裝置有很多優(yōu)異性能：能量密度高、功率密度大、循環(huán)壽命長、充放電時間短、綠色環(huán)保等,已成為國內(nèi)外清潔能源的研究熱點,特別是在最近幾年在全球范圍已經(jīng)引起了學術界和商業(yè)界的廣泛關注。發(fā)展超級電容器最有效的方式就是研發(fā)出具有優(yōu)越性能的電極材料。層狀二硫化鉬納米片具有獨特的二維層狀結構、大的比表面積和好的導電性能,近來在能源領域引起了科學家們的關注。然而單純的二硫化鋁的導電性能相對于碳基材料如石墨烯等還比較低,難以獲得較大的電容量。為此,我們將二硫化鉬納米片與碳基材料如石墨烯、碳氣凝膠、碳納米管以及導電聚合物聚苯胺進行復合,制備了兒種高性能的超級電容器電極材料。主要實驗內(nèi)容如下： (1)利用水熱法制備了二硫化鉬/石墨烯復合物,對MoS2/Gr復合材料形貌進行表征和電化學性能測試,MoS2沉積在Gr上防止阻止了Gr納米片的堆積并形成寬松的結構有利于質(zhì)子和電子在活性物質(zhì)和電解液之間的快速傳遞,提高其利用率；同時Gr納米片較大的空間能夠負載MoS2有利于MoS2活性分子釋放,從而提高了復合材料的電容性。在電流密度為1A/g時,MoS2/Gr (?)匕電容達到了243F/g并且在循環(huán)充放電1000圈后其比電容只損失了7.7%,表明二硫化鉬/石墨烯復合材料具有良好的超級電容性能。 (2)利用水熱法制備了二硫化鉬/碳氣凝膠復合物,對MoS2/Carbon Aerogel復合材料形貌進行了表征和電化學性能進行了測試,Carbon Aerogel嵌入到MoS2納米片中有效阻止了MoS2納米片的團聚從而有效的增大了復合材料的比表面積,同時Carbon Aerogel負載在MoS2納米片上形成孔穴來儲存電子從而進一步提高電子在有限電極材料中的快速傳遞能力,進而使復合材料的電化學活性得到有效的提高,在電流密度為1A/g時,MoS2/Carbon Aerogel的比電容達到260F/g并且在循環(huán)充放電500圈后其比電容只損失了4%,這些表明二硫化鉬／碳氣凝膠復合材料具有良好的超級電容性能。 (3)利用水熱法制備了二硫化鉬／多壁碳納米管復合物,對MoS2/MWCNTs復合材料形貌進行了表征和電化學性能進行測試,可以看到MWCNTs交錯地糾纏在MoS2納米片上組成3D結構的MoS2/MWCNTs復合物,這種3D結構有利于增加復合材料的比表面積,同時結構中MoS2納米片的堆疊將會形成相互交錯的網(wǎng)架更加方便電子和質(zhì)子的傳遞,從而提高了MoS2/MWCNTs的電容性能。在電流密度為1A/g時,MoS2/MWCNTs比電容高達452.7F/g并且在循環(huán)充放電1000圈后其比電容只損失了4.2%,表明二硫化鉬/多壁碳納米管復合材料具有良好的超級電容性能。 (4)利用水熱法制備了分散性好的二硫化鉬納米片,并對其形貌進行了表征。采用簡單的一步原位聚合法制備了二硫化鉬/聚苯胺復合物。對PANI/MoS2復合材料形貌表進行了表征和電化學性能測試,PANI嵌入和堆積在到MoS2納米片上,阻止了MoS2納米片的堆積,從而有效增大了復合材料的比表面積,同時PANI負載在MoS2納米片上形成孔穴來儲存離子,從而提高了電子和質(zhì)子在電極材料中的快速傳遞能力,使復合材料的電化學性能顯著提高。PANI/MoS2復合材料在電流密度為1A/g時比電容達到了575F/g,同時由于PANI分子插入到MoS2納米片中可以避免PANI在氧化還原過程中因分子骨架的變形而造成電極材料的損壞,提高了復合材料的循環(huán)穩(wěn)定性,在恒電流充放電500圈后其比電容只損失了2%,這說明復合材料具有良好的電容性能。
[Abstract]:The energy crisis has become a global problem and aroused widespread concern, to explore new materials with superior performance to solve the energy problem has become one of the most important scientists. The mission of supercapacitor is a new energy storage device has a lot of excellent performance: high energy density, high power density, long cycle life, charge and discharge short time, green environmental protection, has become a hot research topic at home and abroad of clean energy, especially in recent years in the world has attracted widespread attention in academic circles and business circles. The development of super capacitor is the most effective way is to develop electrode materials with superior properties. Layered MoS2 Nanoplates with layered structure two unique, large specific surface area and good conductive properties, has attracted the attention of scientists in the field of energy. However, the conductive properties of the pure aluminum sulfide two Compared with carbon based materials such as graphene is still relatively low, it is difficult to obtain larger capacitance. Therefore, we will molybdenum disulfide and carbon based materials such as graphene, carbon aerogels, carbon nanotubes and conductive polymer polyaniline composite super capacitor electrode material for high performance were prepared. The main experiment the contents are as follows:
(1) MoS2 / graphene composites were prepared by hydrothermal synthesis method, and electrochemical properties to characterize the morphology of the MoS2/Gr composites, MoS2 deposition in Gr prevented the accumulation of preventing Gr nanosheets and forming loose structure in favor of protons and electrons in the active material and the electric liquid solution fast transfer between, improve the utilization rate at the same time; nano Gr large space to load MoS2 to MoS2 active molecules released, thereby improving the capacitance of composite materials. When the current density is 1A/g (MoS2/Gr?) dagger capacitance reached 243F/g and the cycle after 1000 charge discharge cycles the capacitance loss of only 7.7%, that MoS2 / graphene composite material with super capacitor with good performance.
(2) MoS2 / carbon aerogel composites were prepared by hydrothermal method on MoS2/Carbon Aerogel composites were characterized and the electrochemical properties were tested, Carbon Aerogel embedded into MoS2 nanosheets can effectively prevent MoS2 nanosheets agglomeration effectively increases the specific surface area of the composite, and Carbon the formation of cavities in the Aerogel load of MoS2 nanosheets to store electronic so as to further improve the rapid transfer ability in Electronic Co. electrode materials, and the electrochemical activity of composite materials has been effectively improved, when the current density is 1A/g, Aerogel, MoS2/Carbon and 260F/g in the specificcapacitance cycle after 500 charge discharge cycles the specific capacitance only the loss of 4%, these show that MoS2 / carbon aerogel composite material with super capacitor with good performance.
(3) MoS2 / MWCNTs composites were prepared by hydrothermal method, the morphology of the MoS2/MWCNTs composites were tested and the electrochemical characterization, we can see the MWCNTs staggered entangled MoS2/MWCNTs complexes consist of 3D structure in MoS2 nanosheets, this 3D structure is conducive to increasing the specific surface area of the composite. At the same time the structure will be stacked MoS2 nanosheets form staggered grid more convenient transfer of electrons and protons, thereby improving the performance of MoS2/MWCNTs capacitor. When the current density is 1A/g MoS2/MWCNTs, the specific capacitance is 452.7F/g and in circulation after 1000 charge discharge cycles the capacitance loss of only 4.2%, show that MoS2 / multi wall carbon nanotube composite material with super capacitor with good performance.
(4) of the dispersed MoS2 nanoplates were prepared by hydrothermal synthesis method, and the morphology was characterized. The MoS2 / PANI composites were prepared by one-step in situ polymerization. The simple PANI/MoS2 composite sheet for the morphology and electrochemical characterization test, PANI and embedded to MoS2 accumulation in the nano film stop, accumulation of the MoS2 nanosheets, which effectively increases the specific surface area of the composite, and the formation of cavities in the PANI load of MoS2 nanosheets to store ions, thereby improving the rapid transfer of electrons and protons in the electrode material delivery capability, which significantly improve the electrochemical properties of composite materials of.PANI/MoS2 composite material in current the density of 1A/g specific capacitance reached 575F/g, at the same time as PANI molecules into MoS2 nanosheets can be avoided in the PANI during the redox process due to deformation caused by the molecular skeleton of electrode material The damage of the material increased the cycle stability of the composites. After constant current charge and discharge for 500 cycles, the specific capacitance of the composite material only lost 2%, indicating that the composite material has good capacitance performance.

【學位授予單位】：信陽師范學院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：O614.612;TM53

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