本文選題：超級(jí)電容器 + MnO_2��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：隨著傳統(tǒng)能源帶來(lái)的環(huán)境問(wèn)題日益加劇,綠色環(huán)保的新型能源成為研究的熱點(diǎn),于是,能效高無(wú)污染的超級(jí)電容器應(yīng)運(yùn)而生,成為一種被廣泛應(yīng)用的儲(chǔ)能設(shè)備。電極材料的性質(zhì)對(duì)超級(jí)電容器性能起決定性作用。因此,開(kāi)發(fā)具有能量密度高、倍率性能好等優(yōu)越性能的電極材料已成為了研究的方向。本文以錳系金屬氧化物(MnO_2、MnCo2O4.5)為基礎(chǔ),用簡(jiǎn)單的方法制備了其與過(guò)渡金屬氧化物(Co_3O_4)、碳基材料(石墨烯,Graphene)、導(dǎo)電聚合物(聚吡咯,PPy;聚苯胺,PANI)以及金屬有機(jī)骨架(MOFs)的三元復(fù)合材料并研究了其電化學(xué)性能,本課題主要開(kāi)展的工作如下:(1)以改進(jìn)Hummers法制備的氧化石墨烯(GO)作為模板,用化學(xué)原位氧化聚合法結(jié)合水熱法合成了PPy/Graphene/MnO_2,通過(guò)各種手段對(duì)該復(fù)合材料的形貌和結(jié)構(gòu)進(jìn)行了表征,通過(guò)循環(huán)伏安(CV)、計(jì)時(shí)電位(GCD)、交流阻抗(EIS)等技術(shù)探究了其容量、倍率、循環(huán)穩(wěn)定性等電化學(xué)性能。結(jié)果顯示,PPy/Graphene/MnO_2復(fù)合材料克服了PPy循環(huán)穩(wěn)定性不好,Graphene容量不高以及MnO_2導(dǎo)電性較差等不足之處,在1 A·g-1電流密度下,表現(xiàn)出492.56 F·g-1的相對(duì)較大的比電容。(2)通過(guò)簡(jiǎn)單的水熱法和電化學(xué)沉積法設(shè)計(jì)合成了一種具有核-核-殼異質(zhì)結(jié)構(gòu)的Co_3O_4/PANI/Mn O2,通過(guò)XRD、SEM以及TEM等表征手段對(duì)其形貌和結(jié)構(gòu)進(jìn)行測(cè)試,通過(guò)CV、GCD、EIS等技術(shù)對(duì)其電化學(xué)性能進(jìn)行了研究。結(jié)果證明,這種具有異質(zhì)結(jié)構(gòu)的復(fù)合材料利用個(gè)體的協(xié)同效應(yīng),在10 A·g-1大電流密度下,展現(xiàn)出1686.7 F·g-1的超高比電容以及充放電1000個(gè)循環(huán)之后,高達(dá)114.9%的容量保持率,為核殼結(jié)構(gòu)電極材料的發(fā)展和理想超級(jí)電容器的構(gòu)建開(kāi)拓了思路。(3)以金屬有機(jī)骨架ZIF-67為模板,通過(guò)離子共沉淀原理合成了具有空心多面體結(jié)構(gòu)的Co_3O_4@NiCo_2O_4@MnCo_2O_(4.5)三元金屬氧化物復(fù)合材料,通過(guò)XRD、SEM、EDS、TEM、XPS、FTIR以及BET等方法對(duì)這種具有特殊結(jié)構(gòu)的納米材料進(jìn)行系統(tǒng)的表征,通過(guò)CV、GCD、EIS等技術(shù)研究了其容量、倍率、循環(huán)穩(wěn)定性等電化學(xué)性能。結(jié)果表明,在10 A·g-1大電流密度下,該復(fù)合材料仍有1060F·g-1的較大容量,充放電1000個(gè)循環(huán)之后,容量保持率高達(dá)98.1%,說(shuō)明其循環(huán)穩(wěn)定性較好,是一種理想的超級(jí)電容器電極材料。
[Abstract]:With the increasing environmental problems brought by traditional energy, new energy sources of green and environmental protection have become the focus of research. Therefore, supercapacitors with high energy efficiency and no pollution have emerged as a kind of widely used energy storage equipment. The properties of electrode materials play a decisive role in the performance of supercapacitors. Therefore, the development of electrode materials with high energy density and good rate performance has become the research direction. This paper is based on the manganese metal oxide, MNO _ 2 and MnCo _ 2O _ 4. The ternary composites with transition metal oxide Co3O _ 4, carbon-based materials (graphene Graphenen, conducting polymer (polypyrrole PPyrite; Polyaniline Panni) and metal-organic skeleton (MOFs) were prepared by a simple method and their electrochemical properties were studied. The main work of this paper is as follows: (1) PPyR / Graphene / MNO _ 2 was synthesized by chemical in-situ oxidation polymerization combined with hydrothermal method, and the morphology and structure of the composite were characterized by various methods, using the modified Hummers method to prepare graphene oxide (GOO) as a template. The electrochemical properties of cyclic voltammetry (CV), chronopotentiometry (GCD) and AC impedance spectroscopy (EIS) were investigated by means of cyclic voltammetry (CV), cyclic voltammetry (CV), cyclic stability and so on. The results show that the PIP / Graphene / MNO _ 2 composite overcomes the disadvantages of poor cyclic stability of PPy and poor MnO_2 conductivity. At 1 A g ~ (-1) current density, A kind of Co_3O_4/PANI/Mn O _ 2 with core-shell heterostructure was designed and synthesized by simple hydrothermal method and electrochemical deposition method. The morphology and structure of Co_3O_4/PANI/Mn O _ 2 with core-shell heterostructure were measured by means of XRD-SEM and TEM. The electrochemical performance was studied by CVGCD-EIS and other techniques. The results show that the composite with heterogeneous structure exhibits an ultra-high specific capacitance of 1686.7 F g ~ (-1) and a capacity retention rate of 114.9% after charging and discharging 1000 cycles at a high current density of 10 A g ~ (-1), using the synergistic effect of individual. For the development of core-shell structure electrode materials and the construction of ideal supercapacitors, the idea of developing core-shell structure electrode materials and the construction of ideal supercapacitors has been developed. Based on the metal-organic skeleton ZIF-67 as the template, the Co3O structure Co _ 3O _ 2O _ 4mn Co _ 2O _ 2O _ 2 composite with hollow polyhedron structure has been synthesized through the principle of ion coprecipitation. The nano-materials with special structure were systematically characterized by means of XRDD-SEMC-EDS-TEMP-FTIR and BET. The electrochemical properties such as capacity, ratio, cyclic stability and so on were studied by CVGCD-EIS. The results show that the composite still has a large capacity of 1060F g ~ (-1) under the high current density of 10A g ~ (-1). After 1000 cycles of charge and discharge, the capacity retention rate is up to 98.1%, which indicates that the composite has good cycling stability and is an ideal electrode material for supercapacitor.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33;TM53

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