Three sandwich-like[Ln_(2)Fe_(2)(B-α-FeW_9O_(34))_(2)]^(10-) clusters(Ln_(2)Fe_(4),Ln=Dy(1),Ho(2),and Y(3)) were obtained by reacting Na_9[B-α-SbW_9O_(33)],Ln_(2)O_(3),FeCl_(3)·6H_(2)O and KH_(2)PO_(4).The[B-α...Three sandwich-like[Ln_(2)Fe_(2)(B-α-FeW_9O_(34))_(2)]^(10-) clusters(Ln_(2)Fe_(4),Ln=Dy(1),Ho(2),and Y(3)) were obtained by reacting Na_9[B-α-SbW_9O_(33)],Ln_(2)O_(3),FeCl_(3)·6H_(2)O and KH_(2)PO_(4).The[B-α-FeW_9O_(34)]^(11-) units were formed via the in situ conversion of lacunary polyoxometalates(POM)[B-α-SbW_9O_(33)]^(9-)and the Ln^(3+)ions were generated from the slow dissolution of Ln_(2)O_(3),both of which play important roles in the synthesis of Ln_(2)Fe_(4).Ln_(2)Fe_(4) is the first 3d-4f cluster assembled from d-metal heteroatom-containing POM.The Dy_(2)Fe_(4) cluster exhibits single-molecule magnet properties with an 80 K energy barrier in an optimal DC field.Cyclic voltammetry tests and controlled-potential coulometry experiments show that the polyoxometalate Fe heteroatom in clusters 1-3 is also electrochemically active.展开更多
TiO2/Bi2WO6 （TB） heterojunction photocatalyst was successfully synthesized and characterized by XRD, SEM, TEM, UV-Vis and photoluminescence measurement. The heterojunction interface structure of TB heterojunction ph...TiO2/Bi2WO6 （TB） heterojunction photocatalyst was successfully synthesized and characterized by XRD, SEM, TEM, UV-Vis and photoluminescence measurement. The heterojunction interface structure of TB heterojunction photocatalyst was optimized via adjusting the ethylene glycol/water （EG/W） ratio. Based on XRD, SEM and TEM, the crystal size of Bi2WO6 reduced from 14.6 nm to 8.8 nm, and the interface structure between Bi2WO6 nanosheets and TiO2 particle significantly changed with increasing EG concentration. Furthermore, the photoeatalytic activity and the related mechanism of TB heterojunction photocatalyst were systematically discussed. Among them, TBEG/w sample shows the highest normalized apparent rate constant, which is attributed to its highest electron-hole pairs separation ability driven by optimized heterojunction interface between two semiconductors.展开更多
基金supported by the National Natural Science Foundation of China(Nos.21871224,92161104,92161203 and 21721001)Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM No.RD2021040301)。
文摘Three sandwich-like[Ln_(2)Fe_(2)(B-α-FeW_9O_(34))_(2)]^(10-) clusters(Ln_(2)Fe_(4),Ln=Dy(1),Ho(2),and Y(3)) were obtained by reacting Na_9[B-α-SbW_9O_(33)],Ln_(2)O_(3),FeCl_(3)·6H_(2)O and KH_(2)PO_(4).The[B-α-FeW_9O_(34)]^(11-) units were formed via the in situ conversion of lacunary polyoxometalates(POM)[B-α-SbW_9O_(33)]^(9-)and the Ln^(3+)ions were generated from the slow dissolution of Ln_(2)O_(3),both of which play important roles in the synthesis of Ln_(2)Fe_(4).Ln_(2)Fe_(4) is the first 3d-4f cluster assembled from d-metal heteroatom-containing POM.The Dy_(2)Fe_(4) cluster exhibits single-molecule magnet properties with an 80 K energy barrier in an optimal DC field.Cyclic voltammetry tests and controlled-potential coulometry experiments show that the polyoxometalate Fe heteroatom in clusters 1-3 is also electrochemically active.
文摘TiO2/Bi2WO6 （TB） heterojunction photocatalyst was successfully synthesized and characterized by XRD, SEM, TEM, UV-Vis and photoluminescence measurement. The heterojunction interface structure of TB heterojunction photocatalyst was optimized via adjusting the ethylene glycol/water （EG/W） ratio. Based on XRD, SEM and TEM, the crystal size of Bi2WO6 reduced from 14.6 nm to 8.8 nm, and the interface structure between Bi2WO6 nanosheets and TiO2 particle significantly changed with increasing EG concentration. Furthermore, the photoeatalytic activity and the related mechanism of TB heterojunction photocatalyst were systematically discussed. Among them, TBEG/w sample shows the highest normalized apparent rate constant, which is attributed to its highest electron-hole pairs separation ability driven by optimized heterojunction interface between two semiconductors.
