近红外量子点因其优异的组织穿透性和较低的光损伤,广泛应用于生物成像等领域。本文制备了一种水相CuInS2/ZnS-FA量子点,该量子点在近红外区域表现出优异的光学性能,具有良好的荧光稳定性和水相分散性。生物毒性测试结果显示其具有良好...近红外量子点因其优异的组织穿透性和较低的光损伤,广泛应用于生物成像等领域。本文制备了一种水相CuInS2/ZnS-FA量子点,该量子点在近红外区域表现出优异的光学性能,具有良好的荧光稳定性和水相分散性。生物毒性测试结果显示其具有良好的生物兼容性,表明该材料在生物医学成像等领域具有应用潜力。Near-infrared quantum dots are widely used in fields such as biological imaging due to their excellent tissue penetration and low light-induced damage. In this study, a water-based CuInS2/ZnS-FA quantum dot was synthesized, which exhibits outstanding optical performance in the near-infrared region, with good fluorescence stability and water dispersion. Biotoxicity tests demonstrate that the quantum dots have good biocompatibility, indicating that this material has potential applications in fields such as biomedical imaging.展开更多
锂硫电池由于其高能量密度、低成本效益被认为是最有前途的下一代电池体系之一.然而多硫化物的穿梭效应大幅降低了锂硫电池的循环稳定性和寿命,严重阻碍其实际应用.无机金属化合物材料改性的隔膜不仅能抑制多硫化锂(LiPS)的穿梭效应,其...锂硫电池由于其高能量密度、低成本效益被认为是最有前途的下一代电池体系之一.然而多硫化物的穿梭效应大幅降低了锂硫电池的循环稳定性和寿命,严重阻碍其实际应用.无机金属化合物材料改性的隔膜不仅能抑制多硫化锂(LiPS)的穿梭效应,其部分特殊的晶面还能加速多硫化物的氧化还原反应动力学.本文在罗盘状ZnS表面原位生长球状的MoO_(2),制备MoO_(2)/ZnS复合材料.MoO_(2)对多硫化物有着较强的吸附作用,ZnS有着良好的电导率,两者的复合可加速电子传导效率和氧化还原速率.以所制备的MoO_(2)/ZnS作为隔膜改性材料,锂硫电池在5 C的大电流密度下,经过1000次循环后仍可以保持690 mAh g^(-1)的放电比容量,平均每圈的容量衰减率仅为0.014%,表现出优异的循环性能和倍率性能.展开更多
The shuttle effect of polysulfides is one of the key factors hindering the commercialization of lithiumsulfur batteries(LSBs).Owing to their high conductivity and advantageous structure,heterostructures can be used in...The shuttle effect of polysulfides is one of the key factors hindering the commercialization of lithiumsulfur batteries(LSBs).Owing to their high conductivity and advantageous structure,heterostructures can be used in sulfur fixation and catalysis of LSBs.In this study,a flower-shaped ZnO/ZnS heterostructure on a nitrogendoped porous carbon(NPC) sulfur host was designed.The ZnO/ZnS heterostructure regulates the electronic structure of the material and exhibits higher metal-like properties.Moreover,the ZnO/ZnS heterostructure combines the strong adsorption property of ZnO and the high catalytic ability of ZnS to realize the anchoring-diffusionconversion of lithium poly sulfides(LiPSs).Results reveal that the developed ZnO/ZnS@NPC/S cathode has excellent electrochemical performance in LSBs,achieving a high discharge specific capacity of 1365.3 mAh·g^(-1) at 0.1C and excellent rate capability(719 mAh·g^(-1) at 2C;the capacity decay rate is only 0.042% per cycle after 1000 cycles).Even under a high sulfur loading-E/S(electrolyte/sulfur)ratio of 5.1 mg·cm^(-2)-6 μl·mg^(-1),a high specific capacity of 723.7 mAh·g^(-1) is maintained after 60 cycles.This study provides a new strategy for a multifunctional sulfur host that can effectively alleviate the shuttle effect of LiPSs and improve the utilization of sulfur active substances.展开更多
文摘近红外量子点因其优异的组织穿透性和较低的光损伤,广泛应用于生物成像等领域。本文制备了一种水相CuInS2/ZnS-FA量子点,该量子点在近红外区域表现出优异的光学性能,具有良好的荧光稳定性和水相分散性。生物毒性测试结果显示其具有良好的生物兼容性,表明该材料在生物医学成像等领域具有应用潜力。Near-infrared quantum dots are widely used in fields such as biological imaging due to their excellent tissue penetration and low light-induced damage. In this study, a water-based CuInS2/ZnS-FA quantum dot was synthesized, which exhibits outstanding optical performance in the near-infrared region, with good fluorescence stability and water dispersion. Biotoxicity tests demonstrate that the quantum dots have good biocompatibility, indicating that this material has potential applications in fields such as biomedical imaging.
文摘锂硫电池由于其高能量密度、低成本效益被认为是最有前途的下一代电池体系之一.然而多硫化物的穿梭效应大幅降低了锂硫电池的循环稳定性和寿命,严重阻碍其实际应用.无机金属化合物材料改性的隔膜不仅能抑制多硫化锂(LiPS)的穿梭效应,其部分特殊的晶面还能加速多硫化物的氧化还原反应动力学.本文在罗盘状ZnS表面原位生长球状的MoO_(2),制备MoO_(2)/ZnS复合材料.MoO_(2)对多硫化物有着较强的吸附作用,ZnS有着良好的电导率,两者的复合可加速电子传导效率和氧化还原速率.以所制备的MoO_(2)/ZnS作为隔膜改性材料,锂硫电池在5 C的大电流密度下,经过1000次循环后仍可以保持690 mAh g^(-1)的放电比容量,平均每圈的容量衰减率仅为0.014%,表现出优异的循环性能和倍率性能.
基金financially supported by Yunnan Major Scientific and Technological Projects (No.202202AG050003)Yunnan Fundamental Research Projects (Nos.202101BE070001-018 and 202201AT070070)。
文摘The shuttle effect of polysulfides is one of the key factors hindering the commercialization of lithiumsulfur batteries(LSBs).Owing to their high conductivity and advantageous structure,heterostructures can be used in sulfur fixation and catalysis of LSBs.In this study,a flower-shaped ZnO/ZnS heterostructure on a nitrogendoped porous carbon(NPC) sulfur host was designed.The ZnO/ZnS heterostructure regulates the electronic structure of the material and exhibits higher metal-like properties.Moreover,the ZnO/ZnS heterostructure combines the strong adsorption property of ZnO and the high catalytic ability of ZnS to realize the anchoring-diffusionconversion of lithium poly sulfides(LiPSs).Results reveal that the developed ZnO/ZnS@NPC/S cathode has excellent electrochemical performance in LSBs,achieving a high discharge specific capacity of 1365.3 mAh·g^(-1) at 0.1C and excellent rate capability(719 mAh·g^(-1) at 2C;the capacity decay rate is only 0.042% per cycle after 1000 cycles).Even under a high sulfur loading-E/S(electrolyte/sulfur)ratio of 5.1 mg·cm^(-2)-6 μl·mg^(-1),a high specific capacity of 723.7 mAh·g^(-1) is maintained after 60 cycles.This study provides a new strategy for a multifunctional sulfur host that can effectively alleviate the shuttle effect of LiPSs and improve the utilization of sulfur active substances.
