Abstract
Crystallinity and specific surface area of a photocatalyst are two important factors in determining the ultimate photocatalytic performances. In this work, hierarchical bismuth tungstate (Bi2WO6) microspheres with modulations in crystallinity and surface area were carefully synthesised using hydrothermal method with a subsequent calcination treatment. Comparison of activities in photocatalytic water splitting was performed systematically to understand the role of each factor. While larger surface area is in general perceived to provide more active sites for reactions, it was found in this work that crystallinity which governs the photoexcited charge transportation has a more profound impact in influencing the photocatalytic water oxidation. These findings should be applicable to other powder type photocatalytic materials.
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