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Truncated octahedral bipyramidal TiO2/MXene Ti3C2 hybrids with enhanced photocatalytic H2 production activity.

ABSTRACT: MXene Ti3C2/TiO2 hybrids were successfully synthesized through a simple calcination of F-terminated Ti3C2. The resultant Ti3C2/TiO2 composite photocatalysts retained a 2D multilayer structure like MXene Ti3C2, and TiO2 exhibited a truncated octahedral bipyramidal structure with exposed (001) facets under the participation of fluorine ions. The residual Ti3C2 could act as a co-catalyst to enhance the photocatalytic H2 production activity by capturing photogenerated electrons from TiO2 because of its electron reservoir feature and suitable Fermi level. The (101)-(001) surface heterojunction of the truncated octahedral bipyramidal TiO2 further accelerated the separation of photogenerated carriers. As a result, the Ti3C2/TiO2 hybrids with calcining F-terminated Ti3C2 exhibited photocatalytic hydrogen production that is twofold higher than that of Ti3C2/TiO2 hybrids with calcining OH-terminated Ti3C2. This work presented a new strategy to prepare MXene Ti3C2/TiO2 hybrids for photoconversion applications.

SUBMITTER: Li Y 

PROVIDER: S-EPMC9418716 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Truncated octahedral bipyramidal TiO<sub>2</sub>/MXene Ti<sub>3</sub>C<sub>2</sub> hybrids with enhanced photocatalytic H<sub>2</sub> production activity.

Li Yang Y   Zhang Dainan D   Feng Xionghan X   Liao Yulong Y   Wen Qiye Q   Xiang Quanjun Q  

Nanoscale advances 20190304 5

MXene Ti<sub>3</sub>C<sub>2</sub>/TiO<sub>2</sub> hybrids were successfully synthesized through a simple calcination of F-terminated Ti<sub>3</sub>C<sub>2</sub>. The resultant Ti<sub>3</sub>C<sub>2</sub>/TiO<sub>2</sub> composite photocatalysts retained a 2D multilayer structure like MXene Ti<sub>3</sub>C<sub>2</sub>, and TiO<sub>2</sub> exhibited a truncated octahedral bipyramidal structure with exposed (001) facets under the participation of fluorine ions. The residual Ti<sub>3</sub>C<sub>2</s  ...[more]

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