本文關(guān)鍵詞： 超級(jí)電容器 生物質(zhì)絲瓜絡(luò) 多孔碳材料 氧化錳　出處：《青島大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：超級(jí)電容器(也可以成為電化學(xué)電容器)是一種介于電池和傳統(tǒng)電容器的重要的新型能源裝置。傳統(tǒng)的碳材料在一定程度上加劇了氣候變暖和環(huán)境惡化。所以,采用廢棄的生物質(zhì)作為碳基材料的原料引起了廣泛的關(guān)注。本文尋找到了一種成本低、產(chǎn)量高的生物質(zhì)絲瓜絡(luò)為原料,探討不同活化劑對(duì)絲瓜絡(luò)多孔炭形貌、結(jié)構(gòu)和其電化學(xué)性能的影響。為了進(jìn)一步增加多孔炭的比電容,發(fā)揮金屬氧化物在充放電過程中的贗電容行為,在多孔炭上負(fù)載錳氧化物,研究復(fù)合材料的電化學(xué)行為。本文選擇絲瓜絡(luò)生物質(zhì)為碳前驅(qū)體,經(jīng)H2O2和NaOH處理并碳化,結(jié)果表明絲瓜絡(luò)碳材料具有分級(jí)多孔管狀結(jié)構(gòu)。以預(yù)處理的絲瓜絡(luò)為碳原料,分別采用KOH和ZnCl2為活化劑制備絲瓜絡(luò)多孔碳材料。XRD圖譜表明LSPC-KOH和LSPC-Zn Cl2均為無定型炭。LSPC-KOH BET比表面積分別高達(dá)3400 m~2/g,具有更多的中孔。在兩電極6 M KOH超級(jí)電容體系中0.5 A/g電流密度下LSPC-KOH和LSPC-ZnCl2的比電容值分別為178 F/g和98 F/g。無論是擴(kuò)散電阻還是傳質(zhì)電阻,LSPC-KOH均小于LSPC-ZnCl2。通過對(duì)比,PC-KOH無論是在孔結(jié)構(gòu)還是比表面積,甚至是電化學(xué)性能都得到了較好的效果。將優(yōu)選的高比表面積絲瓜絡(luò)多孔碳材料,通過浸漬后再經(jīng)過不同溫度下熱處理方法制備了一系列氧化錳負(fù)載的多孔炭樣品,XRD結(jié)果表明500℃熱處理所得到的是MnO2,600℃熱處理所得到的是MnO,隨著溫度的增加,錳氧化物的結(jié)晶度升高。SEM分析表明負(fù)載氧化錳前后多孔炭的結(jié)構(gòu)和形貌基本一致,溫度升高,氧化錳從薄膜轉(zhuǎn)換為顆粒狀。BET和孔徑分布分析結(jié)果表明負(fù)載氧化錳前后孔徑變化幅度不是太大,負(fù)載前后比表面積和總孔容降低。電化學(xué)性能分析表明:具有優(yōu)異的充放電可逆性和穩(wěn)定性,而且等效串聯(lián)電阻較小。當(dāng)500℃下熱解制備的復(fù)合材料電化學(xué)性能效果最好,其比電容值從多孔炭的178 F/g提高達(dá)到了212 F/g,比電容增加了19.1%。
[Abstract]:Super capacitor (also can become the electrochemical capacitor) is an important new energy device between a battery and conventional capacitors. Conventional carbon materials to a certain extent exacerbated the climate change and environmental degradation. Therefore, the use of waste biomass as raw material of carbon based materials have attracted great attention. In this paper, looking for at a low cost, high yield of biomass Loofah as raw materials of different activators on Luffa porous carbon morphology, structure and its electrochemical performance. In order to further increase the specific capacitance of porous carbon, metal oxide play in the process of charging and discharging pseudocapacitive behavior in porous manganese oxides carbon on the electrochemical behavior of composite materials. This paper chooses the loofah biomass as carbon precursors by H2O2 and NaOH and carbonation, results show that loofah carbon materials with hierarchical porous tubular structure. The pretreatment of Loofah as carbon raw materials, respectively using KOH and ZnCl2 as the activating agent for preparation of Luffa porous carbon materials.XRD LSPC-KOH and LSPC-Zn Cl2 spectra showed that both amorphous carbon.LSPC-KOH BET surface area were as high as 3400 m~2/g, with more holes in two. 6 M KOH super capacitor electrode system in the current density of 0.5 A/g LSPC-KOH and LSPC-ZnCl2 specific capacitance values were 178 F/g and 98 F/g. both the diffusion resistance and mass transfer resistance, LSPC-KOH is less than LSPC-ZnCl2. by comparing the PC-KOH, both in the pore structure or surface area, and even the electrochemical performance has been good results. The preferred high surface area of Luffa complex porous carbon material by Impregnation after porous carbon samples a series of manganese oxide supported by different temperature heat treatment method, XRD results show that the 500 degree heat treatment by MnO2600 is hot Processing obtained is MnO, with the increase of temperature, the crystallization degree of manganese oxide increased.SEM analysis showed that the manganese oxide before and after the structure and morphology of porous carbon consistent temperature, manganese oxide from the film is converted to granular.BET and pore size distribution analysis showed that manganese oxide aperture changes before and after the load is not too large, before and after the loading the specific surface area and total pore volume decreased. The analysis shows that the electrochemical properties: excellent discharge reversibility and stability, and the equivalent series resistance is small. When the best electrochemical performance of composite effect under 500 DEG C prepared by pyrolysis, the specific capacitance of porous carbon from 178 F/g increased to 212 F/g, an increase of 19.1%. specific capacitance

【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM53;TB383.4

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