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Development of Monodisperse Mesoporous Microballs Composed of Decahedral Anatase Nanocrystals

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Title: Development of Monodisperse Mesoporous Microballs Composed of Decahedral Anatase Nanocrystals
Authors: Chang, Ying Browse this author
Jiang, Jiayi Browse this author
Wei, Zhishun Browse this author
Kowalska, Ewa Browse this author →ORCID
Keywords: anatase nanocrystal
decahedral anatase
faceted titania
heterogeneous photocatalysis hierarchical structure
mesoporous microballs
{001} facets
{101} facets
Issue Date: Apr-2022
Publisher: MDPI
Journal Title: Catalysts
Volume: 12
Issue: 4
Start Page: 408
Publisher DOI: 10.3390/catal12040408
Abstract: Mesoporous monodisperse microballs of amorphous titania were prepared from solution of absolute ethanol, tetrabutyl titanate (TBOT) and potassium chloride via a sub-zero sol-gel route. The as-obtained microballs were used as the precursor in an alcohothermal (ethanol with a small amount of water) process to synthesize monodisperse mesoporous microballs built of decahedral anatase nanocrystals. FE-SEM observation and XRD analysis have confirmed that the formed decahedral anatase-rich powder retained the original spherical morphology of the precursor. Importantly, a hierarchical structure composed of faceted anatase has been achieved under green conditions, i.e., fluorine-free. Additionally, the hysteresis loops (BET results) have confirmed the existence of mesopores. Interestingly, faceted microballs show noticeable photocatalytic activity under UV/vis irradiation for hydrogen generation without any co-catalyst use, reaching almost forty times higher activity than that by famous commercial titania photocatalyst-P25. It has been proposed that enhanced photocatalytic performance is caused by mesoporous structure and co-existence of two kinds of facets, i.e., {001} and {101}, and thus hindered charge carriers' recombination.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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