Defect-rich hierarchical sponge-like TiO2 nanoparticles were successfully synthesized via the combined one-step hydrothermal method and chemical reduction approach.SEM and TEM images showed their porous structure dens...Defect-rich hierarchical sponge-like TiO2 nanoparticles were successfully synthesized via the combined one-step hydrothermal method and chemical reduction approach.SEM and TEM images showed their porous structure densely packed with even smaller TiO2 particles,while photocatalytic results manifested their superior photocatalytic performance and high stability.The RhB solution(10 ppm)could be absolutely degraded in 60 min,and the degradation rate was twice that of the sample without the treatment by NaBH4.Besides,the TC solution(10 ppm)could be removed by 74.3%in 20 min.PEC measurements also displayed that the photoelectrode based on such defectrich TiO2 nanoparticles had small resistance and improved charge transfer rate.The improved performance can be assigned to rich defects and phase junctions,which was supported by characterization results.The presence of rich defects and phase junctions could not only promote the separation of photogenerated charge carriers,but also accelerate the electron transfer,beneficial for both the photocatalytic and the PEC performance.It is expected that the obtained hierarchical sponge-like TiO2 nanoparticles with rich defects have great potential for photocatalytic applications.展开更多
Size-constrained ultrathin BiOCl nanosheets@C composites were achieved by one-step hydrothermal route.It was found that the carbon coated on the surface of BiOCl nanosheets not only accelerated the separation of elect...Size-constrained ultrathin BiOCl nanosheets@C composites were achieved by one-step hydrothermal route.It was found that the carbon coated on the surface of BiOCl nanosheets not only accelerated the separation of electrons and holes,but also restricted the outward growth of the BiOCl crystal structure to expose more active catalytic sites.In addition,the obtained composites have stable and close interface contact,beneficial for the structural stability of products as well as the rapid charge transfer.The average sheet thickness was in the range of 20–60 nm.Compared with the ability for pure BiOCl to degrade RhB,the degradation rate of the optimal composite can reach 100%within 15 min,while the corresponding photocurrent intensity could reach 5.6µA·cm−2,and its impedance value was also the smallest.The removal experiments of active substances showed that h+and O 2−play important roles in the process of photocatalytic degradation.It can be expected that the resulted composites in this work can be used as potential materials for photocatalytic and photoelectrochemical applications.展开更多
基金This work was financially supported by the National Natural Science Foundation of China (Grant No. 21405105)the Shanghai Natural Science Foundation (14ZR1429300)the State Key Laboratory of Green Catalysis of Sichuan Institutes of Higher Education (LZJ1703).
文摘Defect-rich hierarchical sponge-like TiO2 nanoparticles were successfully synthesized via the combined one-step hydrothermal method and chemical reduction approach.SEM and TEM images showed their porous structure densely packed with even smaller TiO2 particles,while photocatalytic results manifested their superior photocatalytic performance and high stability.The RhB solution(10 ppm)could be absolutely degraded in 60 min,and the degradation rate was twice that of the sample without the treatment by NaBH4.Besides,the TC solution(10 ppm)could be removed by 74.3%in 20 min.PEC measurements also displayed that the photoelectrode based on such defectrich TiO2 nanoparticles had small resistance and improved charge transfer rate.The improved performance can be assigned to rich defects and phase junctions,which was supported by characterization results.The presence of rich defects and phase junctions could not only promote the separation of photogenerated charge carriers,but also accelerate the electron transfer,beneficial for both the photocatalytic and the PEC performance.It is expected that the obtained hierarchical sponge-like TiO2 nanoparticles with rich defects have great potential for photocatalytic applications.
基金This work was financially supported by the National Natural Science Foundation of China (Grant No. 21405105)the Shanghai Natural Science Foundation (14ZR1429300)the State Key Laboratory of Green Catalysis of Sichuan Institutes of Higher Education (LZJ1703).
文摘Size-constrained ultrathin BiOCl nanosheets@C composites were achieved by one-step hydrothermal route.It was found that the carbon coated on the surface of BiOCl nanosheets not only accelerated the separation of electrons and holes,but also restricted the outward growth of the BiOCl crystal structure to expose more active catalytic sites.In addition,the obtained composites have stable and close interface contact,beneficial for the structural stability of products as well as the rapid charge transfer.The average sheet thickness was in the range of 20–60 nm.Compared with the ability for pure BiOCl to degrade RhB,the degradation rate of the optimal composite can reach 100%within 15 min,while the corresponding photocurrent intensity could reach 5.6µA·cm−2,and its impedance value was also the smallest.The removal experiments of active substances showed that h+and O 2−play important roles in the process of photocatalytic degradation.It can be expected that the resulted composites in this work can be used as potential materials for photocatalytic and photoelectrochemical applications.
