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