本文選題：Pt-M　切入點(diǎn)：納米　出處：《蘇州大學(xué)》2015年碩士論文

【摘要】：直接甲醇燃料電池(DMFC)是質(zhì)子交換膜燃料電池的一種,它具有能量轉(zhuǎn)換效率高、結(jié)構(gòu)簡(jiǎn)單、環(huán)境友好等優(yōu)點(diǎn),被認(rèn)為是最理想的可移動(dòng)能源之一。目前為止,Pt和Pt基納米材料仍是最常用作直接甲醇燃料電池的陽(yáng)極材料,但是由于Pt的成本太高,自然界儲(chǔ)存量較少,這使得直接甲醇燃料電池的商業(yè)化受到嚴(yán)重的阻礙。因此,研究一種新型的催化劑,既能降低貴金屬Pt的用量又能增強(qiáng)催化劑催化活性和穩(wěn)定性是迫切需要的。本文主要研究通過形貌控制合成均一的樹枝狀Pt、Pt-Au納米催化劑以及凹形樹突狀Pt Cu合金催化劑對(duì)甲醇的電催化氧化性能。具體研究?jī)?nèi)容如下:(1)通過H2還原法成功合成具有均一結(jié)構(gòu)的Pt納米枝狀材料(Pt NDs),并用溶劑熱法成功在已合成的Pt NDs上接Au。用透射電子顯微鏡(TEM)、X射線衍射(XRD)和能譜(EDX)等方法對(duì)其進(jìn)行物理表征。用電化學(xué)方法測(cè)試它們對(duì)甲醇的氧化還原反應(yīng)的催化性能。結(jié)果表明,Pt NDs和Pt-Au NHs具有較高的電化學(xué)活性比表面積(ECSA)和良好的甲醇氧化電化學(xué)性能。(2)通過水熱法成功合成凹形樹突狀Pt Cu納米催化劑。TEM觀察結(jié)果顯示Pt Cu納米催化劑平均粒徑為30 nm左右。根據(jù)XRD結(jié)果表明Pt Cu納米催化劑是一種面心立方結(jié)構(gòu)。進(jìn)一步的甲醇電催化氧化反應(yīng)的催化性能表明:凹形樹突狀Pt-Cu雙金屬納米晶體在電催化甲醇氧化的應(yīng)用中表現(xiàn)出非常高的活性和很強(qiáng)的抗有毒中間體作用;根據(jù)If/Ib的數(shù)據(jù)對(duì)比發(fā)現(xiàn),Pt Cu(2.76)納米材料比商業(yè)Pt/C催化劑(1.02)具有更強(qiáng)的抗CO中毒能力。Pt Cu納米催化劑的比活性和質(zhì)量活性分別是商業(yè)Pt/C的1.95和2.04倍。
[Abstract]:Direct methanol fuel cell (DMFC) is a kind of proton exchange membrane fuel cell (PEMFC), which has the advantages of high energy conversion efficiency, simple structure and environmental friendliness. It is considered to be one of the most ideal removable energy sources.Up to now, Pt and Pt-based nanomaterials are still the most commonly used anode materials for direct methanol fuel cells. However, due to the high cost of Pt and less storage in nature, the commercialization of direct methanol fuel cells is seriously hindered.Therefore, it is urgent to study a new type of catalyst, which can reduce the amount of noble metal Pt and enhance the catalytic activity and stability of the catalyst.In this paper, the electrocatalytic oxidation of methanol over dendritic Pt-Au nanocatalysts and concave dendritic Pt-Cu alloy catalysts was studied.The specific research contents are as follows: (1) Pt nanocrystalline dendritic materials with uniform structure have been successfully synthesized by H _ 2 reduction method, and au has been successfully deposited on Pt NDs by solvothermal method.It was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD) and EDX.Their catalytic properties for the redox reaction of methanol were measured by electrochemical method.The results show that Pt NDs and Pt-Au NHs have high electrochemical activity specific surface area and good electrochemical performance of methanol oxidation.The average particle size of the catalyst is about 30 nm.According to XRD results, Pt Cu nanocatalyst is a kind of face-centered cubic structure.The catalytic performance of further methanol electrocatalytic oxidation reaction showed that the concave dendritic Pt-Cu bimetallic nanocrystalline showed very high activity and strong anti-toxic intermediate in the application of electrocatalytic methanol oxidation;According to the data of If/Ib, it is found that the nano-materials of Pt-Cu-2.76) have stronger resistance to CO poisoning than commercial Pt/C catalysts. The specific activity and mass activity of Pt-Cu nano-catalysts are 1.95 and 2.04 times of commercial Pt/C, respectively.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM911.4;TB383.1

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相關(guān)期刊論文 前1條

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本文編號(hào)：1714664