Semiconductor photocatalytic materials are of great significance in solar energy conversion and environmental remediation. To overcome serious drawbacks of these materials with respect to narrow light-response range and low quantum efficiency, a variety of strategies have been developed in the past decades to enhance the light harvesting and excitation as well as the charge transfer against recombination. Among various semiconductor photocatalysts, titania is the most important one because of its biological and chemical inertness, nontoxicity, cost-effectiveness, and strong oxidizing power under UV and visible light irradiation. However, the photocatalytic activity of titania must be further enhanced from the viewpoint of practical use and commerce.

To achieve this purpose, we invite investigators to contribute original research articles as well as review articles that will stimulate the continuing efforts to understand the fabrication, characterization, properties, and application of highly active TiO₂-based and other related photocatalytic materials. Potential topics include, but are not limited to:

• Fabrication of TiO₂ with various morphology
• Surface modification and doping of TiO₂
• Facet-mediated photocatalytic materials
• Hierarchically porous photocatalytic materials
• First-principles study of photocatalytic materials
• Photoelectrochemistry of photocatalytic materials
• TiO₂ applications in water and air purification and environmental remediation
• TiO₂ applications in hydrogen production and CO₂ conversion
• TiO₂-based dye-sensitized solar cells
• Other novel non-TiO₂ photocatalytic materials

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