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E-mail: chk@inha.ac.krReceived August 29, 2011, Accepted September 19, 2011Key Words : DSSCs, Dye-sensitized solar cells, High efficiency, DinaphthylphenylamineRecently, dye-sensitized solar cells (DSSCs) have at-tracted great attention because they have advantages inconverting solar energy to electrical energy at low cost. Oneof the key issues in high performance DSSCs is the rationaldesign of the photosensitizers, which can exhibit high solar-to-energy conversion efficiency. The Ru complex photo-sensitizers such as N3, N719 and Black dye exhibit effi-ciencies about 11% under AM 1.5G irradiation.

Ti-HMS samples in which titanium species exist in various forms of isolated tetrahedral state, finely dispersed TiO 2 cluster, and some in extra-framework anatase phase were prepared via a direct synthesis route using dodecylamine (DDS) as a structure directing agent by systematically varying the titanium loadings between 2 and 50 mol% Ti/(Ti+Si) in substrate composition. Physicochemical properties of the materials were evaluated using XRD, SEM/TEM, N 2 adsorption, UV-vis and XANES spectroscopies. Catalytic properties of Ti-HMS in cyclohexene and 2,6-di-tert-butyl phenol (2,6-DTBP) oxidation using aqueous H 2 O 2 , and vapor phase photocatalytic degradation of acetaldehyde were evaluated. High H 2 O 2 selectivity was obtained in cyclohexene oxidation, and cyclohexene conversion was found primarily dependent on the amount of tetrahedrally coordinated Ti sites. For bulky 2,6-DTBP oxidation and photocatalytic oxidation of acetaldehyde, on the other hand, conversions were found dependent on the total amount of Ti sites and maintaining an uniform mesoporous structure in the catalysts was not critical for efficient catalysis.