Book excerpt: 'This book not only provides a fundamental technical background on black TiO2 and the synthesis of this material, it also covers state-of-the-art applications and will provide the reader with current information on property behavior and show the direction of the latest research for this interesting material for energy applications.'IEEE Electrical Insulation MagazineThe transformation of titanium dioxide (TiO2) nanomaterials from white to black using disorder engineering has meant a dramatic increase in their performance in photocatalytic experiments. The efficiency with which black TiO2 nanomaterials can use sunlight to split water molecules for the production of hydrogen is significantly improved compared to using white crystals, and this pure hydrogen can then be used in batteries and fuels. The black TiO2 nanomaterials are also very promising in CO2 conversion, water treatment, and in air quality control.This book aims to present the recent progress on the research of black TiO2 nanomaterials, and how they can be used in a number of clean energy applications. The text covers a number of research topics, including the synthesis of black TiO2 nanomaterials (nanoparticles, nanowires and nanotubes) and their properties, the effect of point defects and ordered/disordered morphology, the applications in charge storage and photoelectrochemical water splitting, use in lithium ion batteries and in microwave absorption. Also included is a theoretical analysis of this research, thereby providing a comprehensive review of the subject for students, researchers and practitioners in catalytic science, materials science, nanotechnology, green technology, and chemistry.