Comment on "Efficient Photochemical Water Splitting by a Chemically Modified n-TiO 2 " (II)

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Abstract
Efficiency is, together with material stability, a major issue for candidate water photolysis materials to be used for the highly desirable and important goal of economical solar hydrogen production, and we acknowledge that modification of TiO2-based materials in the direction proposed by Khan et al. is of considerable interest. This comment, however, concerns the reported 8.35% efficiency for the solar energy conversion system, which, based on the data presented by Khan et al., we believe is misleading and shows an insufficient concern on the part of the study's authors about the spectrum of real terrestrial sunlight.