Rutile TiO2 nanocrystals with exposed {331} facets for enhanced photocatalytic CO2 reduction activity

Rutile TiO2 nanocrystals are exposed with high-index {331} facets. The rutile {101} twinned structures are formed at the boundary of the tetragonal pyramidal branches. Nanocrystals are highly active for photocatalytic reduction of CO2. [Display omitted] Rutile TiO2 nanocrystals with exposed high-ind...

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Bibliographic Details
Published in:Journal of colloid and interface science 2017-10, Vol.504, p.223-229
Main Authors: Truong, Quang Duc, Hoa, Huu Thu, Le, Thanh Son
Format: Article
Language:English
Subjects:
CO2 reduction
High-index facets
Rutile
TiO2
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Summary:Rutile TiO2 nanocrystals are exposed with high-index {331} facets. The rutile {101} twinned structures are formed at the boundary of the tetragonal pyramidal branches. Nanocrystals are highly active for photocatalytic reduction of CO2. [Display omitted] Rutile TiO2 nanocrystals with exposed high-index facets have been investigated in detail by high-resolution transmission electron microscopy (HR-TEM) and selected-area electron diffraction (SAED). It was found that the each branched nanocrystal is bound by 4 facets of high-index {331}. Additionally, rutile {101} twinned structures are formed in the boundary of branches during the growth of multi branches in a hierarchical flower-like nanostructures. Notably, the synthesized nanostructures showed significantly higher photocatalytic activities than that of rod particles with exposed {110} facets in photocatalytic CO2 reduction. Correlating the presence of high-energy surface on rutile nanocrystals with the photocatalytic activity clearly shows the significant role of surface steps in enhancing intrinsic activity for CO2 reduction to methanol.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2017.05.045