TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The titanium precursor, the catalyst, and the distilled water are mixed at room temperature. The step of receiving the titania nanoparticles comprises: receiving the titania nanoparticles from another source; or synthesizing the titania nanoparticles by drying a portion of the titania sol to form titania nanoparticles, and annealing the titania nanoparticles at 300-1000 degrees C. The titania nanoparticles are annealed at 400-700 degrees C, preferably 500 degrees C. The step of mixing the titania sol and the titania nanoparticles to prepare the titania paste comprises mixing the titania sol, the titania nanoparticles, and a dispersing agent to prepare the titania paste. The weight ratio of the dispersing agent to the titania nanoparticles is 10:90-40:60. The molar ratio of the titania nanoparticles to the titanium precursor in the titania sol is 5:1-8:1. The titania sol and the titania nanoparticles are mixed at room temperature. The step of mixing the titania sol and the titania nanoparticles to prepare the titania paste comprises mixing the titania sol, the titania nanoparticles, and a metal solution or powder to prepare a metal-doped titania paste. The step of mixing the titania sol and the titania nanoparticles to prepare the titania paste comprises mixing the titania sol, the titania nanoparticles, and a metal oxide solution or powder to prepare a metal oxide-doped titania paste. The method further comprises: coating a substrate with the titania paste to prepare a titania coated substrate; annealing the titania coated substrate at 400 degrees C; and sensitizing the annealed titania coated substrate with a dye solution to prepare a sensitized titania photoanode electrode for use in dye-sensitized solar cells. Preferred Components: The titanium precursor is titanium tetraisopropoxide. The catalyst is an acid, which is hydrochloric acid. The dispersing agent is hydroxypropyl cellulose with an average molecular weight of greater than or equal to 100000 g/mol. The metal solution or powder includes a metal, which is silver, zinc, cerium or zirconium. The metal oxide solution or powder includes a metal oxide, which is tantalum oxide, erbium oxide, zirconia, gallium oxide, silver(I,III) oxide or ceria. EXAMPLE - No suitable example given.