In this work,well-defined 1D/1D WO3 nanorod/TiO2 nanobelt(WNR/TNB)hybrid heterostructure was fabricated by a simple electrostatic self-assembly method.The structure-property correlation was clarified by characterizing...In this work,well-defined 1D/1D WO3 nanorod/TiO2 nanobelt(WNR/TNB)hybrid heterostructure was fabricated by a simple electrostatic self-assembly method.The structure-property correlation was clarified by characterizing the crystal phases,morphologies,optical properties,photoluminescence and photocatalytic performances of the WNR/TNB heterostructures.It was demonstrated that photocatalytic performances of WNR/TNB heterostructure toward mineralization was superior to blank TNB,WNR and randomly mixed counterparts under simulated solar light irradiation,owing predominantly to the intimate interfacial contact between WNR and TNB,forming intimately integrated heterojunction,which promotes the spatial charge carriers transfer and electron relay,hence prolonging the lifetime of photogenerated electron-hole pairs.Moreover,photocatalytic mechanism was elucidated.It is anticipated that our work would provide an alternative strategy to construct diverse heterostructured photocatalysts for solar energy conversion.展开更多
Ultrathin two-dimensional(2 D)porous nanosheets are one of the most promising nanomaterials in various applications,whereas their synthesis is still challenging.Herein,ultrathin 2 D amorphous TiO_(2)(a-TiO_(2))porous ...Ultrathin two-dimensional(2 D)porous nanosheets are one of the most promising nanomaterials in various applications,whereas their synthesis is still challenging.Herein,ultrathin 2 D amorphous TiO_(2)(a-TiO_(2))porous nanosheet aerogel is synthesized via a surfactant-free assembly process followed by low-temperature calcination.The co-existing O-O and-OH groups on the surface of TiO_(2)precursor break the 3 D spherical symmetry,and the hydrogen bonding among the TiO_(2)precursors is proposed as the main driving force guiding the 2 D assembly.The surfactant-free assembly endows the ultrathin a-TiO_(2)porous nanosheet with improved ionic and electronic conductivity.The porous structure provides high surface area and easy electrolyte penetration,accelerating the Li ion diffusion rate of the a-TiO_(2)porous nanosheet.Attributing to the above advantages,the obtained a-TiO_(2)porous nanosheets are one of the best anode materials for lithium-ion batteries,which is proved by the enhanced electrochemical performance.展开更多
Two dimensional(2D)nanocrystal functional superlattices with a well controlled structure are of significant importance in photonic,plasmonic and optoelectronic applications and have been well studied,but it remains ch...Two dimensional(2D)nanocrystal functional superlattices with a well controlled structure are of significant importance in photonic,plasmonic and optoelectronic applications and have been well studied,but it remains challenging to understand the formation mechanism and development pathway of the superlattice.In this study,we employed in-situ liquid cell transmission electron microscopy to study the formation of 2D superlattice and its local phase transition from hexagonal-to-square nanocrystal ordering.When colloidal nanocrystals flowed in the solution,long-range ordered hexagonal superlattice could be formed either through shrinking and rearrangement of nanocrystal aggregates or via nanocrystal attachment.As the nanocrystals’shape transformed from truncated octahedral to cube,the local superlattice rearranged to square geometry.Moreover,our observations and quantitative analyses reveal that the phase transition from hexagonal to square mainly originates from the strong van der Waals interactions between the vertical(100)facets.The tracking of 2D cube superlattice formation in real-time could provide unique insights on the governing force of superlattice assembling and stabilization.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21673198,21373008 and 21621091)。
文摘In this work,well-defined 1D/1D WO3 nanorod/TiO2 nanobelt(WNR/TNB)hybrid heterostructure was fabricated by a simple electrostatic self-assembly method.The structure-property correlation was clarified by characterizing the crystal phases,morphologies,optical properties,photoluminescence and photocatalytic performances of the WNR/TNB heterostructures.It was demonstrated that photocatalytic performances of WNR/TNB heterostructure toward mineralization was superior to blank TNB,WNR and randomly mixed counterparts under simulated solar light irradiation,owing predominantly to the intimate interfacial contact between WNR and TNB,forming intimately integrated heterojunction,which promotes the spatial charge carriers transfer and electron relay,hence prolonging the lifetime of photogenerated electron-hole pairs.Moreover,photocatalytic mechanism was elucidated.It is anticipated that our work would provide an alternative strategy to construct diverse heterostructured photocatalysts for solar energy conversion.
基金financially supported by the National Natural Science Foundation of China(21771154)Shenzhen Fundamental Research Programs(JCYJ20190809161013453)+1 种基金the Fundamental Research Funds for the Central Universities(20720220031)the 111 Project(B16029)。
文摘Ultrathin two-dimensional(2 D)porous nanosheets are one of the most promising nanomaterials in various applications,whereas their synthesis is still challenging.Herein,ultrathin 2 D amorphous TiO_(2)(a-TiO_(2))porous nanosheet aerogel is synthesized via a surfactant-free assembly process followed by low-temperature calcination.The co-existing O-O and-OH groups on the surface of TiO_(2)precursor break the 3 D spherical symmetry,and the hydrogen bonding among the TiO_(2)precursors is proposed as the main driving force guiding the 2 D assembly.The surfactant-free assembly endows the ultrathin a-TiO_(2)porous nanosheet with improved ionic and electronic conductivity.The porous structure provides high surface area and easy electrolyte penetration,accelerating the Li ion diffusion rate of the a-TiO_(2)porous nanosheet.Attributing to the above advantages,the obtained a-TiO_(2)porous nanosheets are one of the best anode materials for lithium-ion batteries,which is proved by the enhanced electrochemical performance.
基金financially supported by the National Key Research and Development Program of China (2017YFA0206500)the National Natural Science Foundation of China (21673198, 21373008 and 21621091)
文摘Two dimensional(2D)nanocrystal functional superlattices with a well controlled structure are of significant importance in photonic,plasmonic and optoelectronic applications and have been well studied,but it remains challenging to understand the formation mechanism and development pathway of the superlattice.In this study,we employed in-situ liquid cell transmission electron microscopy to study the formation of 2D superlattice and its local phase transition from hexagonal-to-square nanocrystal ordering.When colloidal nanocrystals flowed in the solution,long-range ordered hexagonal superlattice could be formed either through shrinking and rearrangement of nanocrystal aggregates or via nanocrystal attachment.As the nanocrystals’shape transformed from truncated octahedral to cube,the local superlattice rearranged to square geometry.Moreover,our observations and quantitative analyses reveal that the phase transition from hexagonal to square mainly originates from the strong van der Waals interactions between the vertical(100)facets.The tracking of 2D cube superlattice formation in real-time could provide unique insights on the governing force of superlattice assembling and stabilization.
