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Advanced Functional Materials:CsPbB3/Bi2WO6 Enhanced photocatalytic performance of 2D / 2D Z-type heterojunction for CO2 reduction

wallpapers Cruise 2020-07-08
The extensive use of

fossil fuels has increased CO2 emissions exacerbated the energy crisis global warming. Photocatalytic conversion of CO2 to organic fuel is expected to be an ideal solution. Halogen perovskite (PVK) with excellent photoelectric properties is a kind of promising photocatalyst but its high fluorescence quantum efficiency limits its photocatalytic performance. In order to solve this problem the heterojunction of PVK with semiconductor or metal is helpful for the transfer separation of photogenerated charge.

Professor Kuang daibin Associate Professor Chen Hongyan of Sun Yat sen University have successfully developed a new 2D / 2D cspbbr3 / Bi2WO6 Z-type heterojunction which has been applied to photocatalytic CO2 reduction achieved significantly enhanced performance. The ultra-thin Bi2WO6 nanosheets were assembled on the surface of cspbbr3 nanosheets by electrostatic force to construct a heterogeneous interface with large contact area close contact which effectively promoted the Z-type interface charge transfer between Bi2WO6 cspbbr3 improved the efficiency of photogenerated charge separation. Ultrafast spectroscopy ESR KPFM techniques were used to characterize the photogenerated carrier dynamics at the cspbbr3 / Bi2WO6 interface. In this paper ultra-thin Bi2WO6 nanosheets were assembled on the surface of cspbbr3 nanosheets by a simple electrostatic self-assembly technique to construct a Z-type 2D / 2D composite photocatalyst. Ultrafast spectroscopy electrochemical testing KPFM techniques were used to investigate the internal charge dynamics behavior of the composite. The results show that there is a Z-type heterostructure between Bi2WO6 cspbbr3 nanosheets the ultra-thin nanosheets with several atomic layer thickness have larger specific surface area which is helpful to increase the contact area of the two materials effectively shorten the photogenerated charge transfer distance greatly improve the separation efficiency of photogenerated charges retain the strong redox ability of photogenerated carriers. Therefore cspbbr3 / Bi2WO6 composite exhibits excellent photocatalytic activity for CO2 reduction. After further loading Pt nanoparticles as cocatalyst the photogenerated electron yield was 324.0 μ mol g-1 H-1 which was 12.2 times higher than that of single cspbbr3 nanosheets. The results show that controlling the interface quality of heterostructures is an effective way to improve the photocatalytic performance. This result will provide a new idea for the design of highly efficient halogen perovskite based composite photocatalysts.

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