本文選題：直接甲醇燃料電池 + 質(zhì)子交換膜　； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：質(zhì)子交換膜燃料電池(PEMFC),因其具有能量轉(zhuǎn)換效率高、功率密度高、低溫操作和啟動迅速等優(yōu)點,被認為是最有前途的能量轉(zhuǎn)換裝置。其中,質(zhì)子交換膜被公認為是直接甲醇燃料電池的核心部件。美國Du Pont公司生產(chǎn)的商業(yè)化Nafion質(zhì)子交換膜已得到了應(yīng)用,但因其具有較高的甲醇滲透率以及價格昂貴等缺點限制了其進一步的發(fā)展。因此需要探索研究成本低廉、性能較高的Nafion替代膜。聚醚醚酮(PEEK)的價格低廉,并且其性能優(yōu)良。將PEEK磺化后得到SPEEK膜,該膜繼承了PEEK良好的穩(wěn)定性,同時具有較高的電導(dǎo)率,所以被認為是最有可能替代Nafion膜應(yīng)用于DMFC的膜材料。但是相對于Nafion膜,SPEEK膜的質(zhì)子電導(dǎo)率較低,并且提高SPEEK膜的電導(dǎo)率就必須要提高SPEEK膜的磺化度,磺化度的升高會帶來膜的過度溶脹喪失機械性能。為平衡電導(dǎo)率和溶脹則需要對SPEEK膜進行改性。本課題制備合成了三種類型的層狀雙氫氧化物(LDH),它們因為層間陰離子類型不同導(dǎo)致層間距不同,摻雜到SPEEK中以期降低復(fù)合膜的甲醇滲透率并提高質(zhì)子電導(dǎo)率。首先本實驗合成了CO3-LDH、直接型SO4-LDH以及間接型SO4-LDH,并運用XRD、SEM、EDS、FTIR、TGA/DSC對其進行表征,分析異同點。同時合成了兩種磺化度的SPEEK。本課題的最后階段將性能良好的CO3-LDH、直接型SO4-LDH以及間接型SO4-LDH按2.5wt%、5wt%、7.5wt%和10wt%的比例分別摻雜到不同磺化度的SPEEK膜中,用重鑄法制備了LDH/SPEEK復(fù)合膜。然后運用SEM、EDS、TGA/DSC、甲醇溶脹度、甲醇滲透以及質(zhì)子傳導(dǎo)等對復(fù)合膜進行表征。結(jié)果表明,三種類型的LDH,層間距越大,改性復(fù)合膜的吸水率、離子交換容量、質(zhì)子電導(dǎo)率越好,當摻雜量為7.5%時達到最大值。高的SPEEK磺化度,復(fù)合膜的質(zhì)子電導(dǎo)率越高,但其甲醇溶脹度和甲醇滲透率也較大。當摻雜7.5%的直接型SO4-LDH改性高磺化度SPEEK膜時,其電導(dǎo)率達到81.1 m S cm-1可以和Nafion115膜相媲美,選擇性較純SPEEK膜提高2倍,并且要優(yōu)于Nafion115膜。
[Abstract]:Proton exchange membrane fuel cell (PEMFC) is considered as the most promising energy conversion device due to its high energy conversion efficiency, high power density, low temperature operation and rapid start-up. Among them, proton exchange membrane is recognized as the core component of direct methanol fuel cell. The commercial Nafion proton exchange membrane produced by du Pont has been applied, but its further development is limited by its high methanol permeability and high price. Therefore, it is necessary to explore the Nafion substitute membrane with low cost and high performance. The price of polyether ether ketone (peek) is low and its performance is good. After sulfonation of peek, Speek membrane was obtained, which inherits the good stability of peek and has high conductivity, so it is considered to be the most likely substitute for Nafion membrane to be used in DMFC. However, compared with Nafion membrane, the proton conductivity of Speek membrane is relatively low, and it is necessary to increase the sulfonation degree of Speek membrane to increase the conductivity of SPEEK membrane. The increase of sulfonation degree will lead to excessive swelling loss of mechanical properties of SPEEK membrane. In order to balance conductivity and swelling, it is necessary to modify Speek film. Three kinds of layered double hydroxides (LDH) were prepared and synthesized in this paper. They were doped into Speek in order to reduce methanol permeability and increase proton conductivity due to the different types of anions between layers. In this experiment, CO _ 3-LDH, direct so _ 4-LDH and indirect so _ 4-LDH were synthesized and characterized by means of XRDX SEMS-EDS-FTIR TGA / DSC, and their similarities and differences were analyzed. At the same time, two kinds of sulfonation degree Speek were synthesized. In the last stage of this project, the fine CO _ 3-LDH, direct so _ 4-LDH and indirect so _ 4-LDH were doped into the SPEEK films with different sulfonation degrees at the ratio of 2.5 wt% and 7.5 wt% and 10 wt%, respectively. The LDH / Speek composite films were prepared by recasting method. Then the composite membranes were characterized by SEMMA-EDS- TGA / DSC, methanol swelling degree, methanol permeation and proton conduction. The results show that the larger the interlayer spacing of the three types of LDH, the better the water absorption, ion exchange capacity and proton conductivity of the modified composite membrane, and the maximum value is obtained when the doping amount is 7.5. The higher the sulfonation degree of Speek, the higher the proton conductivity of the composite membrane, but the higher the methanol swelling degree and the methanol permeability. When modified with 7.5% direct SO4-LDH, the conductivity of SPEEK film with high sulfonation degree is 81.1 m S cm-1, which is comparable to Nafion 115 film, and the selectivity is 2 times higher than that of pure SPEEK film, and is better than Nafion 115 film.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM911.4

【參考文獻】

相關(guān)博士學(xué)位論文 前1條

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本文編號：2060142