In this book, the authors present current research in the study of metal oxides. Topics discussed include the preparation of titania nanoparticles and relationships between procedures and properties; metal oxides as water retention materials of low humidity proton exchange membrane applications; computational materials design of d0 ferromagnetism in metal oxides; application of transition metal oxides in tandem organic optoelectronics; and catalytic oxidation of VOCs using lanthanum, nickel and lanthanum-nickel oxides.