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姓名	莊舒涵(Su-han Chuang)  查詢紙本館藏	畢業系所	化學學系
論文名稱	導電高分子修飾奈米碳管承載Pt-Sn催化乙醇氧化研究 (Pt-Sn on conducting polymer modified carbon nanotube for ethanol oxidation)
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摘要(中)	陽極觸媒的催化效能是影響直接乙醇燃料電池（Direct Ethanol Fuel cell, DEFC）輸出功率的最大因素。除了觸媒金屬外，支撐金屬的載體也影響觸媒的催化效能。目前常見之觸媒載體有碳黑與奈米碳管。然而奈米碳管表面石墨烯平滑的結構，不利於穩定奈米粒徑的金屬顆粒易於讓奈米粒子在反應中集結。許多研究已報導使用硝酸修飾奈米碳管表面，形成CNx（nitrogen-doped carbon (CNx) nanotubes）可以避免這些缺陷；另外也有許多研究開始使用導電高分子包覆奈米碳管表面來分散金屬顆粒，當鉑奈米粒子和其他過渡金屬固著在聚合物表面，觸媒可以展現出更優良的電子與質子的導電度、保持長時使用之熱穩定性、親水性和提高催化活性表面積。 本研究顯示以導電高分子聚苯胺（Polyaniline）修飾之奈米碳管（PANICNT）作為載體，可以大幅提高乙醇燃料氧化活性並緩解Pt、Pt-Ru與Pt-Sn等奈米金屬粒子於長時間使用後的聚集和金屬流失的問題。承載於PANICNT表面之Pt-Sn奈米粒子可均勻分佈於載體上並保持顆粒尺寸範圍從2.0至4.0 nm之間；相較之下，PtSn顆粒於奈米碳管上則顯示嚴重聚集現象，在Vucan XC-72載體上之分散性也同樣較差。這是因為聚苯胺高分子上之氮官能基能與鉑金形成Pt-N鍵結，有助於均勻金屬顆粒大小展現出高分散性。從循環伏安法實驗中，PtSn/PANICNT觸媒氧化乙醇所產生的電流密度（748.7 A g-1 Pt），較其他未聚苯胺修飾之載體呈現更高的活性。其乙醇氧化之最高電流密度較PtSn/CNT高出458.9 A g-1 Pt。在經過耐受性測試（ADTs）後依然保持了77.8 %的電流密度顯示此技術可提升觸媒的穩定度。這項研究證實了的Pt-Sn二元金屬承載於PANICNT觸媒對於乙醇的氧化可以使鉑金的活性面積提高和催化活性上升並增加其長時使用之穩定性。 進一步，本研究也探討在不同的合成條件下所製備PtSn/PANICNT觸媒的差異。這四種方法為EG-PtSn/PANICNT（以乙二醇為溶劑）、FA-PtSn/PANICNT（以甲酸為溶劑）、pH12-PtSn/PANICNT（以乙二醇為溶劑, pH=12）和R-PtSn/PANICNT（使用硼氫化鈉還原）。實驗結果發現，反應溶液之酸鹼度會影響觸媒金屬的承載以致於電化學測試結果較不佳，另外使用硼氫化鈉還原金屬會使觸媒金屬顆粒聚集嚴重，而單純使用乙二醇還原金屬可以使金屬粒子Pt-Sn分散最均勻。且利用循環伏安法實驗得到EG-PtSn/PANICNT顯現最好的電化學活性表面積以及乙醇氧化的催化活性。
摘要(英)	Catalytic activity of ethanol oxidation reaction is the most critical property dictating ethanol fuel cell performance. In addition to the metal nano-particle, the support material which fixes the nano-catalysts also contributes to the catalytic activity. The most common and widely used catalyst support is carbon black and carbon nanotube. However, the nano-catalysts tend to aggregate during reaction on the smooth graphene-like surface. Recently, there has been numerous report of heterogeneous catalysis that uses nitric acid to functionalize carbon nano-tubes surface which circumvent these deficiencies by forming CNx（nitrogen-doped carbon (CNx) nanotubes. Wrapping carbon nanotube with conducting polymers was recently explored to disperse metallic particles. When metallic platinum and compounds of transition metals are immobilized in the conducting polymer layer, the catalysts system delivered high electronic and protonic conductance, durable thermal stability, higher hydrophilicity, larger specific surface area, and considerable increase in active surface area. Current study demonstrated a novel support based on polyaniline-coated carbon nanotubes can substantially enhance ethanol oxidation activity and mitigate the problems of aggregation and leaching out related to Pt, Pt-Ru or Pt-Sn nano-catalysts. The Pt-Sn nanoparticle supported on PANICNT is sharply distributed with particle sizes ranging from 2.0 to 4.0 nm. For comparison, Pt-Sn particles loaded on bare CNT and XC-72 shows worse dispersion with larger particle size and lower surface area. This is attributed to the presence of strong Pt-N chelating bond between the nano-paticle with the nitrogen on polyaniline. The current densities derived from cyclovoltametry indicated PtSn/PANICNT yielded distinctively higher value （748.7 A g-1 Pt），which is 458.9 A g-1 Pt higher compared to PtSn/CNT without PANI functionalization. Through accelerated degradataion test（ADTs）, the novel catalysts system maintains 77.8 % or the current output after 5000 cycles, thus demonstrated its superior electrochemical stability compared to other supports. This study confirms Pt-Sn binary catalysts support on PANICNT yields superior catalytic activity for ethanol oxidation, higher Pt utilization efficiency, and displayed much better life-time durability when compared to that of PtSn/CNT or PtSn/XC-72. In second part of the work, we compared PtSn/PANICNT catalysts prepared by four different methods：EG- PtSn/PANICNT (ethylene glycol as solvent)、FA- PtSn/PANICNT(formic acid as solvent)、pH12- PtSn/PANICNT (ethylene glycol solvent at PH=12) and R- PtSn/PANICNT (NaBH4 as reducing agent). The result shows higher pH deteriorates the particle quality, while NaBH4 is too strong a reducing agent leading to particle aggregation. Ethylene glycol as a mild reducing agent, provided the best nanao-catalysts growth condition which lead to best Pt-Sn particle dispersion and most homogeneous particle size distribution. Cyclic voltammetry measurement shows EG- PtSn/PANICNT displayed the best electrochemical active surface area （ECSA）and highest catalytic activity for ethanol oxidation.
關鍵字(中)	★ 乙醇氧化反應 ★ 陽極觸媒 ★ 聚苯胺修飾之奈米碳管 ★ 觸媒載體 ★ 奈米金屬粒 ★ 循環伏安法	關鍵字(英)	★ Cyclic voltammetry ★ Nanoparticle catalysts ★ Anode Catalysts ★ Polyaniline Modified Carbon Nanotube ★ Catalyst Support ★ Ethanol Oxidation Reaction
論文目次	目錄 摘要 I Abstract III 誌謝 V 目錄 VI 圖目錄 IX 表目錄 XII 第一章、緒論 1 1-1 前言 1 1-2 燃料電池的簡介與優勢 1 1-3 燃料電池的種類 4 1-4 研究動機與目的 6 第二章、基本原理與文獻回顧 9 2-1 直接乙醇燃料電池原理 9 2-2 乙醇氧化反應 10 2-3 直接乙醇燃料電池之觸媒 13 2-3-1 觸媒之金屬 14 2-3-2 觸媒之載體材料 17 2-3-3 官能基化碳載體材料 26 2-4 直接乙醇燃料電池陽極觸媒材料文獻回顧 29 2-4-1 鉑釕合金（Pt-Ru）觸媒 29 2-4-2 鉑錫合金（Pt-Sn）觸媒 31 2-4-3 其他二元合金觸媒 35 2-5 直接乙醇燃料電池陰極觸媒材料文獻回顧 36 2-6 觸媒之合成與其性質 38 第三章、實驗方法 42 3-1 研究設計與方法 42 3-2 奈米碳管前處理 44 3-3 聚苯胺奈米碳管複合物（Polyaniline-CNT, PANICNT）合成 45 3-4 鉑錫合金觸媒合成 46 3-4-1 醇類還原法（EG） 46 3-4-2 甲酸還原法（FAM method, FA） 47 3-4-3 硼氫化鈉還原法（Borohydride reduction, R） 48 3-4-4 鹼性醇類還原法（Control pH value, pH12） 49 3-5 觸媒特性鑑定與分析 50 3-5-1 高解析掃描穿透式電子顯微鏡 (HRSTEM) 50 3-5-2 X-光粉末繞射儀 (PXRD) 51 3-5-3 X-光光電子能譜儀 (XPS) 52 3-6 觸媒電性測試 52 3-6-1 觸媒漿料配製與工作電極製備 52 3-6-2 乙醇氧化活性測試 53 3-6-3 氫的吸脫附（H-stripping） 53 3-6-4電化學加速耐久性試驗（ADTs） 54 3-7 薄膜電極組製作 54 3-7-1質子交換膜處理 54 3-7-2陽極觸媒製作 54 3-7-3熱壓條件 55 3-7-4 薄膜電極組測試 55 3-8 實驗藥品 56 3-9 實驗儀器設備 58 第四章、結果與討論 59 4-1 聚苯胺奈米碳管複合物載體之結構鑑定 59 4-2 Pt-Sn觸媒之結構鑑定 61 4-3 Pt-Sn觸媒之電化學測試 66 4-3-1 PtSn/C觸媒之氫吸脫附（H-Stripping） 66 4-3-2 PtSn/C觸媒之乙醇氧化反應活性 68 4-3-3 PtSn/C觸媒之穩定度測試 71 4-4 不同合成方法對於觸媒PtSn/PANICNT的影響 74 4-5 直接乙醇燃料電池（MEA）測試 80 第五章、結論與未來展望 82 參考文獻 84
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指導教授	諸柏仁(Po-jen Chu)	審核日期	2012-7-26
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