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Home » Morphological symmetry tailoring enhances photocatalytic water oxidation in BiVO4

Morphological symmetry tailoring enhances photocatalytic water oxidation in BiVO4

In a study published in the journal Science China Chemistry and led by Prof. Rengui Li (State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences), a distinct charge separation difference has been found via rationally tailoring the symmetry of BiVO4 photocatalyst.

Interestingly, for octahedral BiVO4 crystals, photogenerated and holes can be separated between edges and quasi-equivalent facets. However, as for truncated octahedral BiVO4, to transfer to {010} facets while photogenerated holes prefer to accumulate on {120} facets, thus realizing the spatial separation of photogenerated charges between different facets.

Morphology tailoring of BiVO4 crystals leads to a significantly improved photogenerated charge separation efficiency and photocatalytic water activity. The built-in electric field for driving the separation of photogenerated electrons and holes is considered to be modulated by tuning the morphology symmetry of BiVO4 crystals.

“Among via photocatalytic water splitting which enables the direct utilization and storage of solar into chemical fuels, photo-induced charge transfer from a photocatalyst to surface sites is vital in ensuring utilization efficiency,” Li says.

“Therefore, it is of great significance to explore the influence of morphology and facet on the charge separation. Based on the previous research on spatial charge separation between different facets in semiconductor crystals, taking bismuth vanadate with as a platform, this work has revealed the significant role of morphology symmetry in charge separation, which is important to facilitate the rational design of artificial photocatalysts.”

Source: Science China Press

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