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Small: low work function wn nanocubes for near infrared photocatalytic activation of reactive oxygen species

wallpapers News 2020-08-15

using photocatalyst to convert solar energy into available chemical energy or realize environmental purification has become a widely studied topic. Up to now most of the reported photocatalysts only have reaction activity in the ultraviolet or visible light region the near-infrared light (NIR) which accounts for nearly 50% of the solar spectrum can not be effectively utilized which can not meet the application needs of full spectrum solar energy utilization. In addition the reported materials with near-infrared photocatalytic activity are very limited there is still a lack of a clear understing of the light absorption mechanism of near-infrared photocatalytic materials the kinetics of reactive oxygen species (ROS) production at the surface / interface of materials the mechanism still needs further study. Therefore it is very important to explore new NIR driven photocatalysts study their near-infrared photocatalysis mechanism.

recently Professor Yang Bin Professor Guo Chongshen of Harbin University of technology have successfully developed tungsten nitride (WN) near-infrared photocatalytic materials proposed a near-infrared photocatalytic method based on the low work function near-infrared surface plasmon resonance (LSPR) characteristics of wn. The results show that the work function of the cubic phase wn is 3.47 EV it has excellent near-infrared LSPR optical absorption properties. After that a hydrothermal ammonia nitriding method was designed the cubic black wn NCS were successfully prepared. At the same time finite element analysis (FEA) is used to calculate the local electric field distribution of WN irradiated by near-infrared light field the near-infrared LSPR effect of WN is verified. Then the photocatalytic performance of WN driven by NIR was systematically studied. Finally based on DFT calculation method the typical (100) (110) (111) surface ROS activation kinetics of cubic phase wn were calculated the photocatalytic mechanism of WN with low work function near-infrared LSPR effect was proposed. Because the work function of WN is relatively low the binding energy of electrons on the surface of the material is low which can promote the escape of electrons from the surface of the material thus promoting the catalytic activation of various ROS. Therefore the material with low work function has a lower ROS activation energy barrier which makes it possible to use low-energy near-infrared light for photocatalytic reaction. The results provide new ideas for the research design of new near-infrared photocatalytic materials. The first author of this paper is Dr. Huang Weicheng of Harbin Institute of technology. The corresponding authors are Professor Yang Bin Professor Guo Chongshen of Harbin Institute of technology Associate Professor Liu Danqing of Harbin Institute of technology.
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