元素揮發對Mg-Ni-Li合金儲放氫特性之影響

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姓名

劉人豪(Jen-hao Liu) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

元素揮發對Mg-Ni-Li合金儲放氫特性之影響
(Effect of element evaporation on the hydrogen storage properties of Mg-Ni-Li alloy)

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摘要(中)

本實驗於鑄態過共晶Mg-Ni合金(hypereutectic Mg-Ni alloy)中添加Li，觀察Li於300℃高溫下之揮發穩定性對過共晶(Mg-Ni)合金儲放氫特性之影響。
由X光繞射分析得知，鑄態Mg82Ni18合金為Mg與Mg2Ni兩相所構成，而含2 wt.% Li之Mg82Ni18合金為Mg(Li)與Mg2Ni兩相所構成，當Li含量增加至5 wt.%時，Mg(Li)固溶體將轉變成Li(Mg)固溶體結構，但其Li繞射峰角度與純Li之繞射峰角度無明顯差異。
經300 ℃之充分活化後，由於Li的揮發，造成含Li合金之結構回復為不含Li之Mg82Ni18合金結構，但其吸放氫量並無法回復，且隨著Li含量之增加而遞減。其中，含Li之Mg82Ni18合金隨著Li的揮發，共晶Mg與Mg2Ni的結合性降低，導致Mg2Ni催化能力降低，以致於催化距離減少，致使Mg元素吸放氫平台長度大幅縮短。此外，因Li的揮發，亦造成Mg2Ni之吸氫平台亦有微幅降低的現象。

摘要(英)

In this study, Li was added in hypereutectic Mg-Ni alloys for researching the effect of Li addition and evaporation on the hydrogen storage properties of hypereutectic Mg-Ni alloy.
From XRD, there were only Mg and Mg2Ni phases exiting in the as-cast Mg82Ni18 alloy. But Mg(Li) and Mg2Ni phases was observed in the as-cast Mg82Ni18 alloy with 2 wt.% Li. When Li contents enhanced to 5 wt.%, the phases transferred to Li and Mg2Ni.
The structure of Mg82Ni18 alloys with Li contents returned to Mg and Mg2Ni phases after Li evaporation, but the hydrogen capacity decreased with Li contents increasing. The length of first plateau (Mg+H2 → MgH2) decreased appreciably, it is assumed Li addition and evaporation in Mg82Ni18 alloy weaken the bonding of eutectic Mg with Mg2Ni and decreased catalyzing effect of Mg by Mg2Ni. Otherwise, the length of second plateau(Mg2Ni+2H2 → Mg2NiH4) also decreased slightly.

關鍵字(中)

★ 儲放氫特性
★ XRD
★ Mg82Ni18
★ Li

關鍵字(英)

★ XRD
★ hydrogen storage
★ Li
★ Mg82Ni18 alloys

論文目次

中文摘要....................................................i
英文摘要...................................................ii
誌謝......................................................iii
總目錄...................................................iv
圖目錄...................................................vi
表目錄..................................................vii
一、前言與文獻回顧...................................1
1.1 儲氫合金簡介.....................................1
1.2 儲氫合金種類與介紹...............................2
1.3 儲氫合金儲放氫基本原理...........................4
1.3.1 動力學性質.......................................4
1.3.2 熱力學性質.......................................5
1.4 Mg-Ni-Li儲氫合金介紹.............................8
1.5 研究背景與目的...................................9
二、實驗步驟與方法..................................10
2.1 製備合金流程....................................12
2.2 球磨合金流程....................................12
2.3 X 光繞射分析(X-ray diffraction methods，XRD) ...12
2.4 感應耦合電漿質譜儀(Inductively coupled plasma -
Atomic emission spectrometer)成分分析.........12
2.5 合金儲放氫特性測試..............................12
2.5.1 PCI曲線(Pressure-composition-isothermal curves，
PCI)測試........................................13
三、結果與討論......................................14
3.1 結構分析........................................14
3.1.1 鑄態結構分析....................................14
3.1.2 儲放氫前後之結構分析............................18
3.2 儲放氫特性 .....................................21
3.3 充分氫化後之結構分析............................23
3.4 共晶(Mg-Mg2 Ni)催化模型..........................25
四、結論............................................28
五、未來研究與方向..................................29
六、參考文獻........................................30
附錄一 Mg-Ni-Li合金揮發性之探討........................33
附錄二 Mg2 Ni對Mg催化性之探討...........................39

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指導教授

李勝隆(Sheng-long Lee)

審核日期

2008-7-17

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