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Hierarchical flower-like Bi 2 MoO 6 microspheres were successfully synthesized via a facile hydrothermal approach, employing PVP as the crystal growth modifier. The building units of the hierarchical flower-like Bi 2 MoO 6 were constructed by two-dimensional thin flakes, which intercrossed with each other and aggregated together to form the three-dimensional flower-like structure. The PVP amount and hydrothermal duration played crucial roles in the formation of the Bi 2 MoO 6 architectures with evolving morphologies.The Bi 2 MoO 6 samples were first evaluated for the photocatalytic reduction of CO 2 into methanol and ethanol as solar fuels under visible-light irradiation. It has been found that the hierarchical flower-like Bi 2 MoO 6 exhibits highly efficient photocatalytic activity. After 4 hours of irradiation, the yields of methanol and ethanol were 24.8 and 18.8 μmol g cat −1 respectively, higher than those obtained over previously-reported Bi 2 WO 6 hollow microspheres. This demonstrates that the hierarchical flower-like Bi 2 MoO 6 is a simple, efficient and promising visible-light-driven photocatalyst for the photoreduction of CO 2 into solar fuels.

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Two-dimensional sandwich-like Co/C samples with a series of different thicknesses of Pt layers have been developed for oxygen reduction reaction.

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