合金元素(Ce,Al,Sn)添加對LaNix儲氫合金
吸放氫特性之影響

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陳鏡超(Kang-Chiu Chan) 查詢紙本館藏

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能源工程研究所

論文名稱

合金元素(Ce,Al,Sn)添加對LaNix儲氫合金吸放氫特性之影響
(Effect of Ce, Al and Sn addition on the hydrogen storage properties of LaNix alloys )

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摘要(中)

本研究利用電弧熔煉法備製出LaNix (x=4.5~5)、La1-yCeyNi4.9 (y=0.3~0.7)、La0.6Ce0.4Ni4.9-zAlz (z=0.1~0.3)、La0.6Ce0.4Ni4.9-zSnz (z=0.1~0.3)及La0.6Ce0.4Ni4.9-2zAlzSnz (z=0.1~0.2)合金，分別對其結構成份、微結構與儲氫特性進行分析，研究元素Ni、Ce、Al、Sn對LaNi5合金儲氫特性之影響，並期望找出高儲氫量、高吸放氫平台壓及低遲滯的儲氫合金。研究後發現隨著合金中Ni含量減少，合金吸放氫平台壓與儲氫量均有減少趨勢，至於其吸放氫動力及遲滯則無任何影響。添加Ce元素能大幅改善合金吸放氫平台壓及放氫動力，但合金吸氫動力、遲滯及活化能力變差。至於Al元素及Sn元素對合金之影響則與Ce元素完全相反，能改善合金的吸氫動力及遲滯，而合金的吸放氫平台壓及放氫動力則相對變差。

摘要(英)

LaNix (x = 4.5 ~ 5), La1-yCeyNi4.9 (y = 0.3 ~ 0.7), La0.6Ce0.4Ni4.9-zAlz (z = 0.1 ~ 0.3), La0.6Ce0 .4Ni4.9-zSnz (z = 0.1 ~ 0.3) and La0.6Ce0.4Ni4.9-2zAlzSnz (z = 0.1~ 0.2) alloys were prepared by arc-melting. Composition, microstructure and hydrogen storage properties of alloys were analyzed respectively for studying how Ni, Ce, Al, Sn influence on hydrogen storage properties of LaNi5 alloys. Moreover, the research would like to find out a hydrogen storage alloy which has high level of hydrogen storage capacity and absorption-desorption plateau pressure with low degree of hysteresis. There were downward trend of both absorption-desorption plateau pressure and hydrogen storage capacity of alloys while following the descended of the content of Ni, although, absorption-desorption dynamics and hysteresis of alloy were not affected. The addition of element Ce could substantially improve the absorption- desorption plateau pressure and desorption dynamics of alloy, however, the absorption dynamics, hysteresis and activation of alloys were getting worse. The effect of element Al and Sn were absolutely opposite to element Ce, which could improve absorption dynamics and hysteresis of alloy, but absorption-desorption plateau pressure and desorption dynamics of alloy were getting worse relatively.

關鍵字(中)

★ PCI
★ 儲氫合金
★ LaNi5
★ XRD

關鍵字(英)

★ LaNi5
★ XRD
★ Hydrogen storage alloy
★ PCI

論文目次

摘要..........i
Abstract..........ii
誌謝..........iii
總目錄..........iv
圖目錄..........vii
表目錄..........x
一、前言與文獻回顧..........1
1.1儲氫合金的發展..........1
1.2 儲氫合金吸放氫原理..........2
1.3儲氫合金的種類..........5
1.4 La-Ni系列儲氫合金..........6
1.5實驗目的..........13
二、實驗步驟與方法..........16
2.1實驗方法與流程..........16
2.2合金製備流程..........18
2.2.1電弧熔煉法(Arc-Melting)..........18
2.3合金結構分析..........18
2.3.1感應耦合電漿質譜儀(Inductively Coupled Plasma-Mass Spectrometer, ICP-MS)..........18
2.3.2 X光粉末繞射儀(X-Ray Powder Diffractometer,XRPD)..........18
2.4合金微結構分析..........19
2.4.1光學顯微鏡(Optical Microscope,OM)..........19
2.4.2電子微探儀(Electron Probe X-ray Microanalyzer, EPMA)..........19
2.5合金儲氫特性測試..........19
2.5.1活化處理..........19
2.5.2吸放氫動力學曲線..........20
2.5.3 PCI測試..........20
三、實驗結果..........21
3.1 LaNix (x=4.5~5)系列合金..........21
3.1.1合金結構分析..........21
3.1.2合金微結構分析..........23
3.1.3合金儲氫特性分析..........27
3.1.3.1吸放氫動力學測試..........27
3.1.3.2 PCI測試..........28
3.2 La1-yCeyNi4.9 (y=0.3~0.7) 系列合金..........30
3.2.1合金結構分析..........30
3.2.2合金儲氫特性分析..........32
3.2.2.1吸放氫動力學測試..........33
3.2.2.2 PCI測試..........36
3.3 La0.6Ce0.4Ni4.9-zAlz (z=0.1~0.3), La0.6Ce0.4Ni4.9-zSnz (z=0.1~0.3), La0.6Ce0.4Ni4.9-2zAlzSnz (z=0.1~0.2) 系列合金..........38
3.3.1合金結構分析..........38
3.3.2合金儲氫特性分析..........41
3.3.2.1吸放氫動力學測試..........41
3.3.2.2 PCI測試..........45
四、結論..........48
五、未來工作..........50
六、參考文獻..........51

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2010-7-22

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