首页|Highly efficient nitrogen fixation over S-scheme heterojunction photocatalysts with enhanced active hydrogen supply
Highly efficient nitrogen fixation over S-scheme heterojunction photocatalysts with enhanced active hydrogen supply
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Photocatalytic N2 fixation is a promising strategy for ammonia(NH3)synthesis;however,it suffers from relatively low ammonia yield due to the difficulty in the design of photocatalysts with both high charge transfer efficiency and desirable N2 adsorption/activation capability.Herein,an S-scheme CoSx/ZnS heterojunction with dual active sites is designed as an efficient N2 fixation photocatalyst.The CoSx/ZnS heterojunction exhibits a unique pocket-like nanostructure with small ZnS nanocrystals adhered on a single-hole CoSx hollow dodecahedron.Within the heterojunction,the electronic interaction between ZnS and CoSx creates electron-deficient Zn sites with enhanced N2 chemisorption and electron-sufficient Co sites with active hydrogen supply for N2 hydrogenation,cooperatively reducing the energy barrier for N2 activation.In combination with the promoted photogenerated electron-hole separation of the S-scheme heterojunction and facilitated mass transfer by the pocket-like nanostructure,an excellent N2 fixation performance with a high NH3 yield of 1175.37 μmol g-1 h-1 is achieved.This study provides new insights into the design of heterojunction photocatalysts for N2 fixation.
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