Photocatalytic hydrogen evolution is of great importance with the proceeding of dual carbon goals,for inorganic catalysts have been explored with high efficiency.The structure and properties of oxide composites might ...Photocatalytic hydrogen evolution is of great importance with the proceeding of dual carbon goals,for inorganic catalysts have been explored with high efficiency.The structure and properties of oxide composites might take advantage of each compound and display an increased activity.In our previous study,boron doped-Cu_(3)NiBaTi_(4)O_(9)possessed a porous structure and its photocurrent response was apparent.To further verify its excellent catalytic activity,Al_(2)O_(3),and SiO_(2) were selected to replace with BaTi_(4)O_(9)to prepare different composites.The physical and chemical features of each sample were characterized with SEM,XRD,XPS,etc.to reveal their structural variations.Correspondingly,the H_(2)evolution rate was investigated with gas chromatography under the sunlight irritation.A distinct hydrogen yield was recorded with prepared samples.Further,the projected density of states analysis was taken through density functional theory calculations to appreciate the conduction band of the composite.The offered electrons during the photocatalytic process and the potential applicability of composites in the field of photocatalysis was verified.展开更多
The microstructure, dielectric properties and chemical state of Ti element on BaTi_4O_9 (f)/(0.64 BaTi_4O_9-0.36BaPr_2Ti_4O_(12)) composites sample surface were characterized by X-ray diffraction (XRD), Transmission e...The microstructure, dielectric properties and chemical state of Ti element on BaTi_4O_9 (f)/(0.64 BaTi_4O_9-0.36BaPr_2Ti_4O_(12)) composites sample surface were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), LCR meter method and X-ray photoelectron spectroscopy (XPS). The results show that the system is composed of BaTi_4O_9 and BaPr_2Ti_4O_(12) two phases. Pr ions are distributed in the BaWi_4O_9 grains and the segregation of Pr ions was observed on the grain boundaries of BaTi_4O_9/BaTi_4O_9. The content of Ti^(3+) and Ti^(2+) decrease in the BPT system composites due to the addition of BaTi_4O_9 fibers, which improved the dielectric properties of the system. BPT10 sample with 10% BaTi_4O_9 fibers, has the best dielectric properties in the system, its ε_r = 64, tan δ= 1×10^(-4)(at 1 MHz) , and it may be a potential candidate for microwave dielectric ceramics.展开更多
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(2021D01A03)Key Research and Development Projects of Xinjiang Uygur Autonomous Region(2022B02038)+1 种基金Special Training Program for Scientific and Technological Talents of Ethnic Minorities in Xinjiang Uygur Autonomous Region(2020D03025)Project of Tian chi talent leader in Xinjiang Uygur Autonomous Region(2022).
文摘Photocatalytic hydrogen evolution is of great importance with the proceeding of dual carbon goals,for inorganic catalysts have been explored with high efficiency.The structure and properties of oxide composites might take advantage of each compound and display an increased activity.In our previous study,boron doped-Cu_(3)NiBaTi_(4)O_(9)possessed a porous structure and its photocurrent response was apparent.To further verify its excellent catalytic activity,Al_(2)O_(3),and SiO_(2) were selected to replace with BaTi_(4)O_(9)to prepare different composites.The physical and chemical features of each sample were characterized with SEM,XRD,XPS,etc.to reveal their structural variations.Correspondingly,the H_(2)evolution rate was investigated with gas chromatography under the sunlight irritation.A distinct hydrogen yield was recorded with prepared samples.Further,the projected density of states analysis was taken through density functional theory calculations to appreciate the conduction band of the composite.The offered electrons during the photocatalytic process and the potential applicability of composites in the field of photocatalysis was verified.
文摘The microstructure, dielectric properties and chemical state of Ti element on BaTi_4O_9 (f)/(0.64 BaTi_4O_9-0.36BaPr_2Ti_4O_(12)) composites sample surface were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), LCR meter method and X-ray photoelectron spectroscopy (XPS). The results show that the system is composed of BaTi_4O_9 and BaPr_2Ti_4O_(12) two phases. Pr ions are distributed in the BaWi_4O_9 grains and the segregation of Pr ions was observed on the grain boundaries of BaTi_4O_9/BaTi_4O_9. The content of Ti^(3+) and Ti^(2+) decrease in the BPT system composites due to the addition of BaTi_4O_9 fibers, which improved the dielectric properties of the system. BPT10 sample with 10% BaTi_4O_9 fibers, has the best dielectric properties in the system, its ε_r = 64, tan δ= 1×10^(-4)(at 1 MHz) , and it may be a potential candidate for microwave dielectric ceramics.
