本文關(guān)鍵詞：水滑石有序組裝超薄膜及其電化學(xué)性能　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 水滑石 剝層 自組裝 納米薄膜 電極修飾

【摘要】：水滑石類化合物包括水滑石和類水滑石,其主體一般由兩種金屬的氫氧化物構(gòu)成,因此又稱為層狀雙羥基復(fù)合金屬化合物(Layered Double Hydroxide,LDH),由這些化合物插層組裝的一系列超分子材料稱為水滑石類插層材料(LDHs)。其特有的層狀結(jié)構(gòu)使其具有更強的兼容性,水滑石類層狀化合物自發(fā)現(xiàn)以來已有一個世紀,歷代研究者通過對其結(jié)構(gòu)改造進而在催化化學(xué)、吸附、離子交換、電化學(xué)、光化學(xué)等領(lǐng)域進行廣泛應(yīng)用,近代水滑石研究領(lǐng)域有了更廣闊的拓展,如環(huán)保、化妝品、功能高分子材料、納米復(fù)合材料、醫(yī)藥學(xué)、生物-無機材料等。本文研究Mg/Fe-NO3水滑石合成、剝層、自組裝以及電極修飾,闡述鎂鐵水滑石修飾電極(Mg/Fe/[Fe(CN)6]/GCE)的電荷傳輸機理,為今后水滑石剝層和電極修飾的進一步研究提供理論依據(jù)。本論文通過制備Mg/Fe-CO3型水滑石,通過酸堿法處理Mg/Fe-CO3型水滑石制備Mg/Fe-NO3型水滑石,并通過XRD、FT-IR、SEM和EDS進行表征分析。在甲酰胺溶液中通過回流法對Mg/Fe-NO3水滑石進行剝層,制得淡黃色透明的Mg/Fe水滑石納米單片膠體溶液,其表現(xiàn)出膠體特有的丁達爾現(xiàn)象,并且有很好的穩(wěn)定性,根據(jù)實驗結(jié)果可知剝離后的納米片膠體溶液可在氮氣保護下穩(wěn)定存在一周�？疾觳煌琈g/Fe摩爾比、剝層溫度、剝層時間、水滑石起始量下Mg/Fe-NO3水滑石剝層率,從熱力學(xué)角度討論水滑石剝層過程和機理,結(jié)合熱力學(xué)和動力學(xué)為剝層反應(yīng)提供理論基礎(chǔ)。對Mg/Fe水滑石納米單片和K3[Fe(CN)6]進行自組裝研究,制備Mg/Fe/[Fe(CN)6]多層薄膜材料,通過XRD、FT-IR、EDS進行樣品結(jié)構(gòu)分析,結(jié)果表明通過層層自組裝制備的樣品Mg/Fe/[Fe(CN)6]具備水滑石層板結(jié)構(gòu)。通過層層自組裝法在玻碳電極表面進行Mg/Fe/[Fe(CN)6]膜組裝,對玻碳電極進行電化學(xué)反應(yīng)條件進行優(yōu)化,得出Mg/Fe/[Fe(CN)6]/GCE在K3[Fe(CN)6]中進行電化學(xué)測試的最優(yōu)條件為:組裝層數(shù)為10層、電解質(zhì)K3[Fe(CN)6]濃度為0.5 mol/L、電解體系pH為9.0,掃描速率為100mV/s。對Mg/Fe/[Fe(CN)6]/GCE的測量穩(wěn)定性和存儲穩(wěn)定性進行考察,通過循環(huán)伏安法(CV)和交流阻抗分析(EIS)對不同Mg/Fe摩爾比Mg/Fe/[Fe(CN)6]/GCE的電化學(xué)行為進行分析,研究電荷傳輸過程機理,并進行等效電路模擬,計算等效阻抗和容抗。
[Abstract]:Hydrotalcite compounds include hydrotalcite and hydrotalcite, the main body of which is generally composed of two kinds of metal hydroxides. Therefore, it is also called layered Double Hydroxide (LDH). A series of supramolecular materials assembled by the intercalation of these compounds are called hydrotalcite intercalation materials, and their unique layered structure makes them more compatible. It has been a century since the discovery of layered hydrotalcite compounds. Researchers have been widely used in the fields of catalytic chemistry, adsorption, ion exchange, electrochemistry, photochemistry and so on. The research field of modern hydrotalcite has been expanded, such as environmental protection, cosmetics, functional polymer materials, nanocomposites, medicine. In this paper, the synthesis, stripping, self-assembly and electrode modification of Mg/Fe-NO3 hydrotalcite were studied. The mg / Fe / mg / Fe / mg / Fe modified electrode was described. [The charge transport mechanism of Fe(CN)6] / GCE provides a theoretical basis for further research on the delamination and electrode modification of hydrotalcite. In this paper, Mg/Fe-CO3 hydrotalcite is prepared. Mg/Fe-NO3 hydrotalcite was prepared by treating Mg/Fe-CO3 hydrotalcite with acid-base method and FT-IR was used to prepare Mg/Fe-NO3 hydrotalcite. SEM and EDS were used to characterize Mg/Fe-NO3 hydrotalcite in formamide solution. Mg/Fe hydrotalcite nano-colloidal solution was prepared by stripping Mg/Fe-NO3 hydrotalcite in formamide solution. It shows the unique phenomenon of Dindall colloid and has good stability. According to the experimental results, it can be found that the colloidal solution can exist steadily for one week under the protection of nitrogen. The different Mg/Fe molar ratio, stripping temperature and stripping time are investigated. The process and mechanism of Mg/Fe-NO3 hydrotalcite stripping are discussed from the point of view of thermodynamics under the initial value of hydrotalcite. The combination of thermodynamics and kinetics provides a theoretical basis for the stripping reaction. Study on Mg/Fe Hydrotalcite Nano-monoliths and K3. [Fe(CN)6] self-assembly to prepare mg / Fe /. [The structure of multilayer thin films was analyzed by XRDX FT-IRDS. The results showed that the samples were prepared by layer by layer self-assembly. [Fe(CN)6] has a hydrotalcite laminate structure. Mg / Fe / Al _ 2O _ 3 was prepared on the surface of glassy carbon electrode by layer-by-layer self-assembly method. [Fe(CN)6 film was assembled, and the electrochemical reaction conditions of glassy carbon electrode were optimized. [Fe(CN)6] / GCE in K3. [The optimal conditions for electrochemical measurement in Fe(CN)6 are as follows: the number of assembled layers is 10 and electrolyte K3 is obtained. [The concentration of Fe(CN)6 is 0.5 mol / L, the pH of electrolytic system is 9.0, and the scanning rate is 100mV / s. [The measured stability and storage stability of Fe(CN)6 / Mg/Fe were investigated by cyclic voltammetry (CV) and AC impedance analysis (EIS). [The electrochemical behavior of Fe(CN)6 / / GCE was analyzed, the mechanism of charge transport was studied, and the equivalent circuit was simulated to calculate the equivalent impedance and capacitance reactance.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.2

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本文編號：1373495