1;Parts of this thesis have been published in the following journal articles:;6 2;Supervisor's Foreword;7 3;Acknowledgments;9 4;Contents;10 5;1 Introduction;13 5.1;1.1 Hydrogen Energy and Hydrogen Storage Materials;13 5.1.1;1.1.1 The Signi?cance of Hydrogen Energy;13 5.1.2;1.1.2 Characteristics and Research Status of Hydrogen Energy;15 5.1.3;1.1.3 Research Progress of Hydrogen Storage Materials;16 5.1.4;1.1.4 Research Progress of Mg-Based Hydrogen Storage Materials;20 5.1.4.1;1.1.4.1 Fabricating Particular Nanostructures;24 5.1.4.2;1.1.4.2 Doping Catalysts;27 5.1.4.3;1.1.4.3 Recombination with Porous Materials;33 5.2;1.2 Hydrogen Storage Properties of Mg-Based Films;35 5.2.1;1.2.1 Preparation and Characterization of Mg-Based Films;36 5.2.2;1.2.2 Research Progress of Mg-Based Hydrogen Storage Films;36 5.3;1.3 Hydrogen-Induced Property Changes of Thin Films and the Applications;39 5.4;1.4 Contents of This Thesis;41 5.5;References;44 6;2 Experimental Methods;53 6.1;2.1 Film Preparation;53 6.2;2.2 Thin Film Characterization;54 6.2.1;2.2.1 X-Ray Di?raction;54 6.2.2;2.2.2 Scanning Electron Microscope/Energy Dispersive Spectrum Analysis (SEM/EDS);54 6.2.3;2.2.3 Transmission Electron Microscopy (TEM);55 6.3;2.3 Property Measurements of Thin Films;55 6.3.1;2.3.1 Electrical Resistance Measurements [1-3];55 6.3.2;2.3.2 Optical Transmittance Measurements [1-3];56 6.3.3;2.3.3 Electrochemical Property Measurements [5, 6];57 6.4;References;58 7;3 Structural Tailoring of Mg-Based Thin Films and Study of Their Hydrogen Storage Properties;59 7.1;3.1 Introduction;59 7.2;3.2 Experimental;60 7.2.1;3.2.1 Film Preparation;60 7.2.2;3.2.2 Structural Characterization and Property Measurements;60 7.3;3.3 Results and Discussion;61 7.3.1;3.3.1 Gaseous Hydrogen Storage Properties;61 7.3.1.1;3.3.1.1 Structural Characterization;61 7.3.1.2;3.3.1.2 Electrical and Optical Properties;61 7.3.1.3;3.3.1.3 Hydrogen Sorption Kinetics;64 7.3.2;3.3.2 Electrochemical Hydrogen Storage Properties;67 7.3.3;3.3.3 Discussions;69 7.4;3.4 Conclusions;70 7.5;References;70 8;4 Hydrogen Storage Properties of Mg-Based Thin Films with Di?erent Interlayers;72 8.1;4.1 Introduction;72 8.2;4.2 Experimental;73 8.2.1;4.2.1 Film Preparation;73 8.2.2;4.2.2 Structural Characterization;73 8.3;4.3 Results and Discussion;74 8.3.1;4.3.1 Hydrogen Storage Properties of Mg-Ti-Pd Films;74 8.3.1.1;4.3.1.1 Structural Characterization;74 8.3.1.2;4.3.1.2 Electric Resistance Changes;74 8.3.1.3;4.3.1.3 Optical Switching Properties;76 8.3.1.4;4.3.1.4 Electrochemical Behaviors;79 8.3.2;4.3.2 Hydrogen Storage Properties of Mg-Al-Pd Films;81 8.3.2.1;4.3.2.1 Electric Resistance Changes;81 8.3.2.2;4.3.2.2 Optical Switching Properties;83 8.3.3;4.3.3 Mechanism and Discussion;86 8.4;4.4 Conclusions;90 8.5;References;90 9;5 Gaseous and Electrochemical Hydrogen Storage Properties of Mg-Ti Multilayers;91 9.1;5.1 Introduction;91 9.2;5.2 Experimental;92 9.2.1;5.2.1 Film Preparation;92 9.2.2;5.2.2 Structural Characterization;92 9.3;5.3 Results and Discussion;93 9.3.1;5.3.1 Gaseous Hydrogen Storage Properties;93 9.3.1.1;5.3.1.1 Structural Characterization;93 9.3.1.2;5.3.1.2 Electric Resistance Changes;94 9.3.1.3;5.3.1.3 Optical Switching Properties;96 9.3.1.4;5.3.1.4 Gaseous Hydrogenation Mechanism;98 9.3.2;5.3.2 Electrochemical Properties;100 9.3.2.1;5.3.2.1 Electrochemical Charge-Discharge Properties;100 9.3.2.2;5.3.2.2 Electrochemical Hydrogenation Mechanism;104 9.4;5.4 Conclusions;105 9.5;References;105 10;Chapter 6Effects of Different Mg/Ti Ratioson the Electrochemical HydrogenStorage Properties of MgxTi1?x-Pd Films;106 10.1;6.1 Introduction;106 10.2;6.2 Experimental;107 10.2.1;6.2.1 Film Preparation;107 10.2.2;6.2.2 Structural Characterization and Electrochemical Measurements;107 10.3;6.3 Results and Discussion;107 10.3.1;6.3.1 Structural Characterization;107 10.3.2;6.3.2 Electrochemical Properties;108 10.3.3;6.3.3 Mechanism of Electrochemical Hydrogen Storage;111 10.4;6.4 Conclusion;113 10.5;References;113 11;7 C