無電鍍鎳多壁奈米碳管對Mg-23.5wt.%Ni共晶合金儲放氫特性之影響

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江睿彬(Ruei-Bing Chiang) 查詢紙本館藏

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機械工程學系

論文名稱

無電鍍鎳多壁奈米碳管對Mg-23.5wt.%Ni共晶合金儲放氫特性之影響
(Effect of the Electroless Ni Multi-wall CNT on the hydrogen storage properties of Mg-23.5wt.%Ni eutectic alloy)

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摘要(中)

本研究利用熔煉法製備Mg-23.5wt.%Ni共晶合金，再利用球磨法合成含有經無電鍍鎳處理之5wt.%多壁奈米碳管(Electorless Nickel Multi Wall Carbon Nanotubes，EN-MWCNT )之複合儲氫材料，並藉由PCI及DSC測試，研究無電鍍鎳多壁奈米碳管對Mg-23.5wt.%Ni共晶合金儲放氫特性之影響。
研究中發現，無電鍍處理可將鎳析鍍於多壁奈米碳管上，其析鍍金屬顆粒大小為奈米等級，由於經無電鍍鎳處理之多壁奈米碳管具有移轉效應(spillover effect)，其吸氫效果比未經無電鍍鎳處理之多壁奈米碳管佳，移轉效應可降低氫分子分解成氫原子所需的動能，並提供氫原子有利接觸合金之通道，加速氫化反應。球磨法亦可於多壁奈米碳管上生成缺陷提高其表面能，加強物理吸附能力。藉由添加無電鍍鎳多壁奈米碳管可改善Mg-23.5wt.%Ni共晶合金於低溫下之吸氫反應，於160℃與100℃下分別有4.39wt.%及4.22 wt.%的儲氫量。由DSC測試曲線得知，鑄態Mg-23.5wt.%Ni共晶合金添加無電鍍鎳多壁奈米碳管之MgH2放氫起始溫度(onset temperature)為363℃，相較於純鎂之放氫起始溫度408℃降低約45℃，但對於降低Mg2NiH4放氫起始溫度沒有明顯效果。

摘要(英)

Mg-23.5wt.%Ni eutectic alloy were prepared by traditional melting and mixed with 5wt.% electorless nickel multi-wall carbon nanotubes by high energy ball milling for 5h，and we studied the effect of electroless nickel multi-wall carbon nanotubes on the hydrogen storage properties of Mg-23.5wt.%Ni eutectic alloy by PCI and DSC.
The experimental results show that electroless platting can get uniformly distributed nanoparticles on the surface of multi-wall carbon nanotubes which provied a spillover effect，thease reaction acceleration the dissociation of hydrogen molecules and improved the hydrogen storage properties at lower temperatures，the activated Mg-23.5wt.%Ni+5wt.%EN-MWCNT absorbed 4.22wt.% H2 and 4.39wt.% H2 at 100℃and160℃ for 60 min under 40 atm H2，the amount of dehydriding of the sample are nearly zero at 250℃. The DSC curves reveal endothermic peaks associated with hydride decomposition，the onset temperature of MgH2 is 363 ℃for the sample containing 5wt.% EN-MWCNT，which is lower than for the Mg sample(408 ℃) .

關鍵字(中)

★ PCI
★ Mg-23.5wt.%Ni
★ XRD
★ 儲氫合金

關鍵字(英)

★ Mg-23.5wt.%Ni、XRD、PCI

論文目次

中文摘要 ii
Abstract iii
誌謝 iv
目錄 v
圖目錄 vi
表目錄 viii
一、文獻回顧 1
1-1前言 1
1-2儲氫合金儲放氫基本原理 3
1-3 Mg-Ni儲氫合金簡介 6
1-4催化劑-過渡元素、奈米碳管 8
1-5批覆技術-無電鍍法 9
1-6催化劑-無電鍍鎳多壁奈米碳管 10
二、研究背景與目的 13
三、實驗步驟與方法 14
3-1 Mg-23.5wt.%Ni共晶合金製備流程 15
3- 2球磨法製備合金 16
3-3 微結構分析 17
3-3-1 X光粉末繞射分析 17
3-3-2光學顯微鏡金相觀察與能量散佈光譜儀分析 17
3-3-3高解析掃描穿透式電子顯微鏡 17
3-4合金儲放氫性質測試 18
3-5熱式差掃描卡量計分析 18
四、結果與討論 18
4-1合金微結構分析 18
4-2無電鍍鎳多壁奈米碳管之結構分析 20
4-3 MN23.5合金添加無電鍍鎳多壁奈米碳管之結構分析 22
4-4吸放氫動態曲線 22
4-5 PCI曲線測試 26
4-6 DSC曲線分析 29
五、結論 31
六、參考文獻 32

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2011-7-27

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