This book deals with the chemical and electrochemical reactivity of novel materials in various environments. Special emphasis is put on metastable materials such as amorphous and nanostructured materials including carbon nanostructures and the novel bulk metallic glasses. Properties include corrosion resistance, electrochemical and catalytic activities, hydrogen sorption properties etc. The materials are made by various non-equilibrium processes such as rapid-quenching, high energy ball milling and thin film deposition techniques. Hydrogen storage and new materials for Ni-MH batteries are topics of particular interest in this book.