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Phase Transition of Two-Dimensional ?-Ga2O3 Nanosheets from Ultrathin ?-Ga2O3 Nanosheets and Their Photocatalytic Hydrogen Evolution Activities.

ABSTRACT: Monoclinic ?-Ga2O3 nanosheets hold great potential applications in electronic, optical, and photocatalytic fields. In this study, two-dimensional ?-Ga2O3 nanosheets were successfully fabricated through a simple crystalline phase transition from the as-prepared ultrathin ?-Ga2O3 nanosheets. The photocatalytic hydrogen evolution reaction under UV light irradiation was achieved on the two kinds of photocatalysts. However, ?-Ga2O3 with a higher crystallinity shows a lower photocatalytic activity in comparison with ?-Ga2O3. The average apparent quantum yield is calculated to be 0.29% for ?-Ga2O3 nanosheets and 1.82% for ?-Ga2O3. More efficient separation and transfer rates of photogenerated carriers and larger specific areas were found in ?-Ga2O3. On the basis of the analysis of the structures of ?-Ga2O3 and ?-Ga2O3, it is proposed that the disordered or defective structure contributes to the improvement of photocatalytic activity to some extent. Therefore, it is significant to develop the photocatalyst with a stable structure and a certain number of defects at the same time.

SUBMITTER: Zhang X 

PROVIDER: S-EPMC6645061 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Phase Transition of Two-Dimensional β-Ga<sub>2</sub>O<sub>3</sub> Nanosheets from Ultrathin γ-Ga<sub>2</sub>O<sub>3</sub> Nanosheets and Their Photocatalytic Hydrogen Evolution Activities.

Zhang Xiaoyan X   Huang Huijuan H   Zhang Yingguang Y   Liu Dan D   Tong Na N   Lin Jinjin J   Chen Lu L   Zhang Zizhong Z   Wang Xuxu X  

ACS omega 20181031 10

Monoclinic β-Ga<sub>2</sub>O<sub>3</sub> nanosheets hold great potential applications in electronic, optical, and photocatalytic fields. In this study, two-dimensional β-Ga<sub>2</sub>O<sub>3</sub> nanosheets were successfully fabricated through a simple crystalline phase transition from the as-prepared ultrathin γ-Ga<sub>2</sub>O<sub>3</sub> nanosheets. The photocatalytic hydrogen evolution reaction under UV light irradiation was achieved on the two kinds of photocatalysts. However, β-Ga<sub>2<  ...[more]

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