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研究生： 鄒欣庭
Hsin-Ting Chou
論文名稱： 樹枝狀金觸媒在燃料電池的應用
The Electrocatalytic Study of Gold Dendrites for Fuel Cell Applications
指導教授： 洪偉修
Hung, Wei-Hsiu
學位類別： 碩士
Master
系所名稱： 化學系
Department of Chemistry
論文出版年： 2014
畢業學年度： 102
語文別： 中文
論文頁數： 83
中文關鍵詞： 樹狀金電極 、甲醇電氧化 、乙醇電氧化 、甲酸電氧化 、氧氣還原 、樹狀銀電極
英文關鍵詞： gold dendrites, methanol electro-oxidation, ethanol electro-oxidation, formic acid electro-oxidation, oxygen reduction, silver dendrites
論文種類： 學術論文
相關次數： 點閱：148  下載：4 
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    • 除了商用多晶金電極，我們以脈衝式電鍍沉積法，在玻璃碳電極的表面上沉積出具有很好的結晶性，並呈現三軸對稱的樹狀金電極。而我們利用不同的沉積時間製備出不同條件的金電極，如: GD3000s、GD1500s及NP500s。
    　　首先，將製備出不同條件的金電極與商用多晶金電極在0.5 M KOH中進行L-cysteine還原脫附與在0.5 M H2SO4中進行金表面單層氧化物還原脫附的反應，用公式:Q_a/Q_b 來討論Au(111)面在四個不同條件的金電極上分別占的比例對電催化的影響。接著，將不同條件的電極進行甲醇、乙醇、甲酸以及氧氣的催化反應。相較於其他條件的金電極，GD3000s對於甲醇、乙醇及甲酸的電催化效果皆有較好表現。相反的，因顆粒大小的因素，導致GD3000s對於氧氣的電催化效果較其他條件的電極差。
    　　最後，我們以相同的方式在玻璃碳電極上製備出具有良好結晶性的樹狀銀電極。以便於日後研究樹狀金、銀電及之間的活性差異。

    關鍵字:樹狀金電極、甲醇電氧化、乙醇電氧化、甲酸電氧化、氧氣還原、樹狀銀電極

    Apart from the commercial polycrystalline gold electrode, we used pulsed current electrolysis to deposit gold dendrite showing well crystalline and three-order symmetry on the surface of the glassy carbon electrode (GC). And we used different deposition durations to prepare the gold electrodes (GD3000s, GD1500s, and NP500s).
    First, we carried out the reductive desorption of L-cysteine on gold electrodes prepared by different deposition times and commercial polycrystalline gold electrode in 0.5M KOH and desorbed the monolayer oxide on gold surface in 0.5M H2SO4. Following, we used the ratio: Q_a/Q_b to evaluate the effect of an Au(111) facet on the four different gold electrodes in electrocatalysis. We then performed the electrocatalysis reaction with methanol, ethanol, formic acid, and oxygen. Of all the electrodes tested, GD3000s showed the best performance in the electrocatalysis reaction with methanol, ethanol, and formic acid. However, due to its larger particle size, GD3000s exhibited poor electrocatalytic activity of oxygen reduction reaction.
    Finally, we prepared the silver dendrite on glassy carbon with good crystalline structure by the same means, in order to study the difference between gold dendrite and silver dendrite.

    Keyword: gold dendrites、methanol electro-oxidation、ethanol electro-oxidation、formic acid electro-oxidation、oxygen reduction、silver dendrites.

    目錄(CONTENTS) iv 第一章 緒論 1 1.1 前言 1 1.2 直接醇類燃料電池 4 1.2.1 直接甲醇燃料電池(Direct Methanol Fuel Cell，DMFC) 4 1.2.2 直接乙醇燃料電池(Direct Ethanol Fuel Cell，DEFC) 7 1.2.3 直接甲、乙醇燃料電池（DMFC、DEFC）之陽極觸媒 9 1.2.4 三維樹狀金電極(3-D Gold Dendrite) 16 1.3 直接甲酸燃料電池(Direct Formic Acid Fuel Cell，DFAFC) 20 1.4 氧氣與過氧化氫還原反應 (Reduction of Oxygen and Hydrogen Peroxide) 24 第二章 實驗與儀器原理 28 2.1 實驗藥品 28 2.2 實驗流程 29 2.3 實驗製備 30 2.3.1樹狀金電極的製備 30 2.3.2 循環伏安 31 2.3.3 循環伏安之甲醇、乙醇以及甲酸氧化 31 2.3.4 循環伏安之氧氣、過氧化氫還原反應 32 2.3.5 樹狀銀電極的製備 33 2.4 材料分析與鑑定 34 2.4.1粉末X光繞射儀(powder X-ray diffraction，XRD) 34 2.4.2 掃描式電子顯微鏡(Scanning Electron microscope，SEM) 37 2.4.3 穿透式電子顯微鏡(Transmission Electron Microscope，TEM) 39 2.4.4 循環伏安法(Cyclic Voltammetry，CV) 39 第三章 結果與討論 43 3.1 樹枝狀金電極之SEM分析 43 3.2 樹枝狀金電極之XRD分析 45 3.3 樹狀金電極的電化學表面積(Electrochemical Surface Area of Gold Dendrite，ESA) 47 3.4 樹狀金電極在酸性和鹼性介質中的循環伏安特性 49 3.5 金電極在鹼性條件下對甲醇的催化活性表現 52 3.6金電極在鹼性條件下對乙醇的催化活性表現 57 3.7 金電極在酸性條件下對甲酸的催化活性表現 61 3.8金電極在PBS(PH=7.4)溶液中對氧氣的催化活性表現 65 3.9 三維樹狀銀電極(3-D Silver Dendrites) 69 3.9.1 銀電極之SEM與EDX分析 71 3.9.2 銀電極之XPS與XRD分析 73 第四章 結論 77 第五章 參考文獻 79

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