国产伦乱,一曲二曲欧美日韩,AV在线不卡免费在线不卡免费,搞91AV视频

當(dāng)前位置:主頁 > 科技論文 > 電力論文 >

石墨烯基超級電容器:電極材料制備及儲能機(jī)理研究

發(fā)布時間:2018-02-25 05:01

  本文關(guān)鍵詞: 超級電容器 石墨烯 宏觀體 孔結(jié)構(gòu) 表面化學(xué) 二氧化錳 出處:《天津大學(xué)》2014年博士論文 論文類型:學(xué)位論文


【摘要】:超級電容器作為一種綠色儲能器件,其性能主要依賴于電極材料。石墨烯作為sp2雜化碳質(zhì)材料的基元單位,具有獨特的二維結(jié)構(gòu)和優(yōu)異的物化特性,使得其在超級電容器領(lǐng)域具有巨大的應(yīng)用潛力。盡管目前石墨烯的結(jié)構(gòu)特征和物化性質(zhì)可以得到有效調(diào)控,然而其作為超級電容器電極材料的實際比電容均與理論值存在一定差距,能量密度偏低。針對這些不足,本論文主要以石墨烯基碳質(zhì)材料作為超級電容器電極材料,,探討其電化學(xué)儲能機(jī)理,可控構(gòu)建結(jié)構(gòu)獨特的電極材料,使其性能得以優(yōu)化,組裝高性能超級電容器。 在石墨烯基碳質(zhì)電極材料儲能機(jī)制方面:(1)論文以兩種極限結(jié)構(gòu)石墨烯基碳質(zhì)材料作為模板電極材料,考察了它們在水系電解液中的電化學(xué)特性,提出表面化學(xué)是影響完全外表面無孔炭電化學(xué)性能的決定因素,孔結(jié)構(gòu)決定了完全內(nèi)表面微孔炭的電化學(xué)行為,孔結(jié)構(gòu)和表面化學(xué)協(xié)同影響其電容特性。(2)全面考察了微觀結(jié)構(gòu)、比表面積和含氧官能團(tuán)對層次孔石墨烯宏觀體電化學(xué)性能的影響,通過提高電極材料表面含氧官能團(tuán)的濃度,可增加電極材料的親水特性,降低電解質(zhì)離子的擴(kuò)散阻力,提高電極材料的比電容和倍率性能。 在超級電容器電極材料可控制備及應(yīng)用方面:(1)以結(jié)構(gòu)致密但孔隙發(fā)達(dá)的高密度多孔石墨烯宏觀體直接作為超級電容器電極材料,其表現(xiàn)出超高體積比電容,并組裝了高體積能量密度超級電容器。依據(jù)相同的脫水機(jī)制,以石墨烯宏觀體作為支撐骨架,均勻負(fù)載金屬氧化物納米粒子,利用溶液浸漬法制備了超高密度的RuO2/石墨烯復(fù)合宏觀體,二者的協(xié)同儲能效應(yīng)確保了該復(fù)合材料具有超高體積能量密度和功率密度。(2)以三維結(jié)構(gòu)石墨烯水凝膠作為反應(yīng)物和模板,在溫和條件下,發(fā)展了新型反應(yīng)性模板法,制備了三維多孔MnO2納米材料,該材料表現(xiàn)出良好的電化學(xué)性能,其優(yōu)異的倍率性能大大拓展了MnO2的應(yīng)用范圍。通過調(diào)整反應(yīng)物的摩爾比,可以獲得三維結(jié)構(gòu)MnO2/石墨烯復(fù)合宏觀體。
[Abstract]:As a kind of green energy storage device, the performance of supercapacitor mainly depends on the electrode material. As the unit of sp2 hybrid carbon material, graphene has unique two-dimensional structure and excellent physical and chemical properties. It has great potential for application in the field of supercapacitors, although the structure and physicochemical properties of graphene can be effectively regulated at present. However, the actual specific capacitance of the supercapacitor electrode material is far from the theoretical value and the energy density is low. In view of these shortcomings, the graphene based carbonaceous material is mainly used as the electrode material of the supercapacitor in this paper. The mechanism of electrochemical energy storage was discussed, and the electrode material with unique structure was constructed, which made the performance optimization and assembled high performance supercapacitor. In the aspect of energy storage mechanism of graphene based carbon electrode materials, two kinds of limit structure graphene based carbon materials were used as template electrode materials to investigate their electrochemical characteristics in aqueous electrolyte. It is suggested that surface chemistry is the decisive factor affecting the electrochemical performance of porous carbon on the complete outer surface. The pore structure determines the electrochemical behavior of the microporous carbon on the complete inner surface, and the pore structure and surface chemistry synergistically affect the capacitance characteristics of the carbon. The effect of specific surface area and oxygen-containing functional groups on the electrochemical properties of macroporous graphene macrobodies was investigated. By increasing the concentration of oxygen-containing functional groups on the surface of electrode materials, the hydrophilicity of electrode materials was increased and the diffusion resistance of electrolyte ions was reduced. The specific capacitance and rate performance of electrode materials are improved. In the field of controllable preparation and application of electrode materials for supercapacitors, the macroporous graphene with dense structure but well developed pores is directly used as electrode material for supercapacitor, which shows ultra-high volume specific capacitance. A high volume energy density supercapacitor was assembled. According to the same dehydration mechanism, the graphene macrostructure was used as the support skeleton, and the metal oxide nanoparticles were uniformly loaded. The ultrahigh density RuO2 / graphene composite macrostructure was prepared by solution impregnation method. The synergistic energy storage effect between the two materials ensures that the composite has ultra-high volume energy density and power density. The novel reactive template method has been developed under mild conditions using three-dimensional graphene hydrogels as reactants and templates. Three-dimensional porous MnO2 nanomaterials have been prepared. The materials exhibit good electrochemical properties, and their excellent rate performance greatly expands the scope of application of MnO2. By adjusting the molar ratio of reactants, Three dimensional structure MnO2 / graphene composite macrostructure can be obtained.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:TQ127.11;TM53

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 許檢紅;王然;陳經(jīng)坤;王勇;;超級電容器在電動汽車上應(yīng)用的研究進(jìn)展[J];電池工業(yè);2008年05期

2 范厚剛;姜濤;王春忠;陳崗;魏英進(jìn);;Li_3V_2(PO_4)_3制備及其電化學(xué)性能[J];電化學(xué);2009年01期

3 楊紅生,周嘯,馮天富,湯孝平;電化學(xué)電容器最新研究進(jìn)展 I.雙電層電容器[J];電子元件與材料;2003年02期

4 戴春嶺;王先友;黃慶華;李俊;;水溶性酚醛樹脂制備超級電容器用活性炭[J];化工學(xué)報;2008年04期

5 李步廣,劉洪波,張琳,何月德,張紅波;酚醛樹脂基高比表面積活性炭的制備及其電容特性的初步研究[J];炭素;2004年04期

相關(guān)博士學(xué)位論文 前2條

1 孫剛偉;炭基超級電容器正負(fù)極不對稱電容行為研究[D];華東理工大學(xué);2012年

2 于占軍;多層次結(jié)構(gòu)金屬氧化物超級電容器電極材料的研究[D];武漢理工大學(xué);2010年



本文編號:1533072

資料下載
論文發(fā)表

本文鏈接:http://lk138.cn/kejilunwen/dianlilw/1533072.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶851d7***提供,本站僅收錄摘要或目錄,作者需要刪除請E-mail郵箱bigeng88@qq.com
久久草草热国产精| 日本色女人影院| 69AV在线九区| 欧美精品一=999| 大香蕉免费成人在线视频| 亚洲最新无码专区| 国产丝袜人妻一区二区| 97视频国产精华| 十八午夜人人| 少妇诱惑久久久久久久久| 欧美性爱日韩国产欧美| 91视频网址国产一区二区三区| 国产久久大香蕉| 桃色69| 中文日本一二三不卡视频| 久久亚洲AⅤ精品网站| 内射中出91下载免费看| 啊 不要日我啊 网站| 成人91在线网站| 美女精品久久免费精品| 手机看片一级黄片| 国产 欧美 视频一区二区三区| 欧美激情射精在线播放| 色色鲁视频| 色婷婷av亚洲有码中文字幕| 欧美图麻豆| 中文字幕囯产亚洲DVD | 国产日韩欧美色区一区二区| 一本色道AV久久综合无码| 久久久亚洲日韩欧美国产精品一区| 吸咬奶头狂揉60分钟视频真实韩国 | 久久婷婷国产麻豆| 日韩 欧美 成人在线| 欧洲女人喝男人鸡巴视频| 久久毛片免费网站| 色婷婷综合久久中文字幕雪峰| 久久久一区二区国产欧美| 蜜桃午夜福利视频| 久久亚洲春色| 日韩欧美精品成人在线| 99久久自偷自偷国产精品不卡|