Titanium Dioxide Nanotube Arrays for Solar Harvesting Applications to Address Environmental Issues

By virtue of TiO₂ nanotube arrays’ superior properties, such as vectorial pathway of electron (e)- transport, minimized e-recombination, and high specific surface area, make them the most promising candidate for solar energy harvesting applications to address environmental issues. Photoelectrochemical cells (PECs) and dye-sensitized solar cells (DSSCs) assembled with TiO₂ nanotube arrays have attracted great interest due to their outstanding potential to convert solar energy to hydrogen (H₂) fuel and electricity, respectively. However, the performance of PECs and DSSCs are greatly determined by structural characteristics of nanotube arrays. Hence, related literatures such as solar energy harvesting technologies, principle of PECs and DSSCs, anodic growth and crystallization of self-organized TiO₂ nanotube arrays and their PECs’ and DSSCs’ performances are elaborated in this chapter.