臺灣博碩士論文加值系統

本論文著重在增進金屬儲氫合金的儲氫性質和其性能，並比較其優劣。我們利用高能機械球磨法，和旋轉熔煉爐(RCM)均在氬氣氣氛下製備鎂鎳合金，催化劑鈀則分別利用高能機械球磨法和多元醇法添加，來改善其儲氫性質。從XRD分析中得知，使用高能球磨法與熔煉法均有Mg2Ni的峰質產生，從結果中可發現，Mg2Ni和催化劑鈀均有促進鎂基儲氫合金其吸氫動能。利用熱力學分析氫化物，可得知因不同配比而有不同的熵變化。另一種催化劑鈀的添加方式是以Polyol process 讓催化劑鈀附著在經球磨製備的鎂鎳合金粉末表面上，從吸氫動能圖中，可發現均能有效促進吸氫速率。

Our experiment was focus on metal hydrogen storage material to improve hydrogen absorption kinetic. Mg99Ni1-Xwt% Pd (X=0, 0.2, 1) and Mg90Ni10-X wt% Pd (X=0, 0.2, 1) alloys were melted and ball milled under an argon atmosphere. XRD phase analysis reveals Mg2Ni peak in both the melted and ball-milled alloys. The Mg2Ni and Pd have both catalytic and synthetic effects on improving the hydrogen sorption kinetics of the alloy. The results of thermodynamic analysis of magnesium hydride correspond to the values of differential scanning calorimetry measurements.
Ball milled Mg99Ni1-Xwt% Pd (X=0, 0.2, 1) and Mg90Ni10-Xwt% Pd (X=0, 0.2, 1) were doped with Pd nanoparticles via a polyol process. Such a process allows a great amount of Pd particles and cluster mounted on the Mg-based alloy powder surface. The hydrogen absorption rate of Mg-based alloy have been improved greatly.

中文摘要 ......i
Abstract .....ii
誌謝 …...iii
Table of Contents………………………………………………………...iv
Table Caption List……………………………………………………….vi
Figure Caption List..............................................................................vii
Chapter 1
Introduction 1
1.1 The hydrogen economy 1
1.2 Material of hydrogen storage 2

Chapter 2
Literature review 3
2.1 Storage hydrogen summary 3
2.2 Physics and chemistry Metal hydrides 4
2.3 Thermodynamics characteristic 5
2.4 Hydrogen absorption 7
2.5 Magnesium-based hydrides 9
2.6 Effect of catalysts deposition 10
2.7 Mg-based alloy fabricate by ball milled and melted 14
2.8 Polyol process application in preparation nanoparticle 15

Chapter 3
Experimental Procedures 24
3.1 Experiment procedure 24
3.2 The mechanical alloy and rotation-cylinder method 25
3.3 Doped Pd by polyol process 26
3.4 Characterization of alloy powders 30
3.4.1 X-ray Diffraction analysis 30
3.4.2 SEM observation 30
3.4.3 UV-visible 30
3.5 Pressure-composition-isotherms (PCI) test 31

Chapter 4
Results and Discussion 35
4.1 Enhancement hydrogen sorption kinetic of Mg-based alloys by Pd-coating 35
4.1.1 Phase analysis and particle morphology 35
4.1.2 Hydrogen absorption behavior 37
4.1.3 Pressure-Composition isotherm (PCI) result 40
4.1.4 Calculation of thermodynamics 40
4.2 Hydrogen sorption kinetic enhancement of Mg-based alloys by polyol process Pd 42
4.2.1 Characterization of Pd-doped magnesium alloy powder 42
4.2.2 Hydrogen absorption kinetic of palladium-doped Magnesium based alloy 43
Chapter 5
Conclusions 72
References 73

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