Sodium ion batteries(SIBs)currently lack sufficient anode materials that simultaneously demonstrate exceptional capacity,durability under prolonged cycling,and rapid charging capabilities.Antimony(Sb)has emerged as an...Sodium ion batteries(SIBs)currently lack sufficient anode materials that simultaneously demonstrate exceptional capacity,durability under prolonged cycling,and rapid charging capabilities.Antimony(Sb)has emerged as an attractive alloy-based anode candidate due to its notable theoretical capacity,nevertheless grappling with significant challenges including substantial structural deformation during operation and sluggish ion transport kinetics.Herein,we atomically disperse Sb into open Cu-S frameworks with high cyclic stability and good conductivity.In-situ and ex-situ analyses reveal the multistep reversible reaction processes during the charging(formation of Cu_(3)SbS_(4))and discharging(precipitation of fracture-resistant Na_(3)Sb in the ionic-conductive Na_(x)Cu_(2)S_(2)/Na_(2)S matrix)processes.As a result,the thoughtfully engineered Cu_(3)SbS_(4)anode,without requiring additional carbon compositing,attains a high reversible specific capacity of 597 mAh g^(−1)at a 0.3 C rate.It also maintains approximately 95%capacity retention even at 15 C after 4300 cycles.The assembled Cu_(3)SbS_(4)||Na_(3)V_(2)(PO_(4))_(3)full cell achieves 10 C high rate performance and demonstrates excellent cycling stability of∼94.0%capacity retention after 200 cycles.Our approach to material design might offer a novel method for creating durable,high-capacity,and high-rate anode materials for sodium-ion batteries.展开更多
Due to the relatively sluggish charge carrier separation in metal sulfides,the photocatalytic activity of them is still far lower than expected.Herein,sulfur vacancies and in-plane SnS_(2)/SnO_(2) heterojunction were ...Due to the relatively sluggish charge carrier separation in metal sulfides,the photocatalytic activity of them is still far lower than expected.Herein,sulfur vacancies and in-plane SnS_(2)/SnO_(2) heterojunction were successfully introduced into the SnS_(2) nanosheets through high energy ball-milling.These defective structures were studied by the electron paramagnetic resonance,Raman spectra,X-ray photoelectron spectroscopy,and high-resolution transmission electron microscope analyses.The sulfur vacancies and in-plane heterojunctions strongly accelerate the separation of photoexcited electron-hole pairs,as confirmed by the photo luminesce nce emission spectra and time-resolved photoluminescence decay spectra.The introduction of sulfur vacancies and in-plane heterojunction in SnS_(2) nanosheets results in roughly six times higher photodegrading rate for methyl orange and four times higher photocatalytic reduction rate of Cr6+than those of pure SnS_(2) nanosheets.展开更多
A series of novel silica-based hybrid adsorbents were prepared by the crosslinking reaction of N-[3- （trimethoxysilyl）propyl] ethylene diamine （TMSPEDA） with epichlorohydrin （ECH） via a sol-gel process. Fourier ...A series of novel silica-based hybrid adsorbents were prepared by the crosslinking reaction of N-[3- （trimethoxysilyl）propyl] ethylene diamine （TMSPEDA） with epichlorohydrin （ECH） via a sol-gel process. Fourier transform infrared （FTIR） spectra confirmed that the reaction occurred. TGA curves showed that the thermal stability of these hybrid adsorbents reached as high as 180 ℃. As a typical example, the adsorption performance of nickel（U） ions onto an adsorbent （the volume ratio of TMSPEDA and ECH was 4：1 ） was explored. It was found that the adsorption of nickel（Ⅱ） ions onto this adsorbent followed the Lagergren pseudo-second-order kinetic model. The investigation of the adsorption mechanism demonstrated that nickel（Ⅱ） adsorption was chiefly controlled by diffusion-chemisorption, suggesting that more diffusion processes were involved in the adsorption of nickel（Ⅱ） ions onto this type of adsorbents. Desorption experiment indicates that these hybrid adsorbents can be regenerated. These findings reveal that this type of silica-based hybrid adsorbent is promising in the separation and recovery of nickel（Ⅱ） ions from Ni-containing wastewater or contaminated water.展开更多
ZnO films coated with reduced graphene oxide（RGO-ZnO） were prepared by a simple chemical approach. The graphene oxide（GO） films transferred onto ZnO films by spin coating were reduced to RGO films by two steps（ex...ZnO films coated with reduced graphene oxide（RGO-ZnO） were prepared by a simple chemical approach. The graphene oxide（GO） films transferred onto ZnO films by spin coating were reduced to RGO films by two steps（exposed to hydrazine vapor for 12 h and annealed at 600 °C）. The crystal structures, electrical and photoluminescence properties of RGO-ZnO films on quartz substrates were systematically studied. The SEM images illustrated that RGO layers have successfully been coated on the ZnO films very tightly. The PL properties of RGO-ZnO were studied. PL spectra show two sharp peaks at 390 nm and a broad visible emission around 490 nm.The resistivity of RGO-ZnO films was measured by a Hall measurement system, RGO as nanofiller considerably decrease the resistivity of ZnO films. An electrode was fabricated, using RGO-ZnO films deposited on Si substrate as active materials, for super capacitor application. By comparison of different results, we conclude that the RGOZnO composite material couples possess the properties of super capacitor.展开更多
基金supported by the National Natural Science Foundation of China(22471283,52202327)the Science and Technology Commission of Shanghai Municipality(22ZR1471300,23DZ1200800)+1 种基金the Natural Science Foundation of Jiangxi Province(20224BAB204002,GJJ211320)the Jingdezhen Science and Technology Bureau(20212GYZD009-15)。
文摘Sodium ion batteries(SIBs)currently lack sufficient anode materials that simultaneously demonstrate exceptional capacity,durability under prolonged cycling,and rapid charging capabilities.Antimony(Sb)has emerged as an attractive alloy-based anode candidate due to its notable theoretical capacity,nevertheless grappling with significant challenges including substantial structural deformation during operation and sluggish ion transport kinetics.Herein,we atomically disperse Sb into open Cu-S frameworks with high cyclic stability and good conductivity.In-situ and ex-situ analyses reveal the multistep reversible reaction processes during the charging(formation of Cu_(3)SbS_(4))and discharging(precipitation of fracture-resistant Na_(3)Sb in the ionic-conductive Na_(x)Cu_(2)S_(2)/Na_(2)S matrix)processes.As a result,the thoughtfully engineered Cu_(3)SbS_(4)anode,without requiring additional carbon compositing,attains a high reversible specific capacity of 597 mAh g^(−1)at a 0.3 C rate.It also maintains approximately 95%capacity retention even at 15 C after 4300 cycles.The assembled Cu_(3)SbS_(4)||Na_(3)V_(2)(PO_(4))_(3)full cell achieves 10 C high rate performance and demonstrates excellent cycling stability of∼94.0%capacity retention after 200 cycles.Our approach to material design might offer a novel method for creating durable,high-capacity,and high-rate anode materials for sodium-ion batteries.
基金National Key Research And Development Program(No.2016YFB0901600)CAS Center for Excellence in Superconducting Electronics+3 种基金the Key Research Program of Chinese Academy of Sciences(Nos.QYZDJ-SSWJSC013 and KGZD-EW-T06)National Natural Science Foundation of China(Nos.21871008 and 21801247)Jingdezhen Science and Technology Bureau(No.20192GYZD008-21)Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures(No.SKL 201804)。
文摘Due to the relatively sluggish charge carrier separation in metal sulfides,the photocatalytic activity of them is still far lower than expected.Herein,sulfur vacancies and in-plane SnS_(2)/SnO_(2) heterojunction were successfully introduced into the SnS_(2) nanosheets through high energy ball-milling.These defective structures were studied by the electron paramagnetic resonance,Raman spectra,X-ray photoelectron spectroscopy,and high-resolution transmission electron microscope analyses.The sulfur vacancies and in-plane heterojunctions strongly accelerate the separation of photoexcited electron-hole pairs,as confirmed by the photo luminesce nce emission spectra and time-resolved photoluminescence decay spectra.The introduction of sulfur vacancies and in-plane heterojunction in SnS_(2) nanosheets results in roughly six times higher photodegrading rate for methyl orange and four times higher photocatalytic reduction rate of Cr6+than those of pure SnS_(2) nanosheets.
基金Supported by the National Natural Science Foundation of China(21376059)the Key Discipline of Hefei University(2014xk01)
文摘A series of novel silica-based hybrid adsorbents were prepared by the crosslinking reaction of N-[3- （trimethoxysilyl）propyl] ethylene diamine （TMSPEDA） with epichlorohydrin （ECH） via a sol-gel process. Fourier transform infrared （FTIR） spectra confirmed that the reaction occurred. TGA curves showed that the thermal stability of these hybrid adsorbents reached as high as 180 ℃. As a typical example, the adsorption performance of nickel（U） ions onto an adsorbent （the volume ratio of TMSPEDA and ECH was 4：1 ） was explored. It was found that the adsorption of nickel（Ⅱ） ions onto this adsorbent followed the Lagergren pseudo-second-order kinetic model. The investigation of the adsorption mechanism demonstrated that nickel（Ⅱ） adsorption was chiefly controlled by diffusion-chemisorption, suggesting that more diffusion processes were involved in the adsorption of nickel（Ⅱ） ions onto this type of adsorbents. Desorption experiment indicates that these hybrid adsorbents can be regenerated. These findings reveal that this type of silica-based hybrid adsorbent is promising in the separation and recovery of nickel（Ⅱ） ions from Ni-containing wastewater or contaminated water.
基金supported by the National Natural Science Foundation of China(Nos.61464005,51562015)the Natural Science Foundation of Jiangxi Province(Nos.20143ACB21004,20151BAB212008,20171BAB216015)+2 种基金the Jiangxi Province Foreign Cooperation Projects,China(No.20151BDH80031)the Leader Training Object Project of Major Disciplines Academic and Technical of Jiangxi Province(No.20123BCB22002)the Key Technology R&D Program of the Jiangxi Provine of Science and Technology(No.20171BBE50053)
文摘ZnO films coated with reduced graphene oxide（RGO-ZnO） were prepared by a simple chemical approach. The graphene oxide（GO） films transferred onto ZnO films by spin coating were reduced to RGO films by two steps（exposed to hydrazine vapor for 12 h and annealed at 600 °C）. The crystal structures, electrical and photoluminescence properties of RGO-ZnO films on quartz substrates were systematically studied. The SEM images illustrated that RGO layers have successfully been coated on the ZnO films very tightly. The PL properties of RGO-ZnO were studied. PL spectra show two sharp peaks at 390 nm and a broad visible emission around 490 nm.The resistivity of RGO-ZnO films was measured by a Hall measurement system, RGO as nanofiller considerably decrease the resistivity of ZnO films. An electrode was fabricated, using RGO-ZnO films deposited on Si substrate as active materials, for super capacitor application. By comparison of different results, we conclude that the RGOZnO composite material couples possess the properties of super capacitor.
