Evolution of Stabilized 1T-MoS2 by Atomic-Interface Engineering of 2H-MoS2/Fe−Nx towards Enhanced Sodium Ion Storage

Metallic conductive 1T phase molybdenum sulfide (MoS₂) has been identified as promising anode for sodium ion (Na⁺) batteries, but its metastable feature makes it difficult to obtain and its restacking during the charge/discharge processing result in part capacity reversibility. Herein, a synergetic effect of atomic-interface engineering is employed for constructing 2H-MoS₂ layers assembled on single atomically dispersed Fe−N−C (SA Fe−N−C) anode material that boosts its reversible capacity. The work-function-driven-electron transfer occurs from SA Fe−N−C to 2H-MoS₂ via the Fe−S bonds, which enhances the adsorption of Na⁺ by 2H-MoS₂, and lays the foundation for the sodiation process. A phase transfer from 2H to 1T/2H MoS₂ with the ferromagnetic spin-polarization of SA Fe−N−C occurs during the sodiation/desodiation process, which significantly enhances the Na⁺ storage kinetics, and thus the 1T/2H MoS₂/SA Fe−N−C display a high electronic conductivity and a fast Na⁺ diffusion rate.     

基于FPGA的通用开放式星载陀螺模拟器设计

陀螺是小卫星平台上姿轨控制分系统中的重要敏感元件,而陀螺模拟器是小卫星姿轨控制分系统地面测试过程模拟陀螺仪的数据流向和时序关系的必要设备。针对通用化的小卫星陀螺模拟器的设计需求,开发了一种基于FPGA和CAN总线接口的陀螺模拟器,采用了FPGA作为主控芯片,实现了支持多类常用星载陀螺数据通信协议的实时接口,并配置了具备电平隔离功能的CAN、RS-485等总线接口电路,实际配置一种工作状态的测试和实验验证表明,所设计的陀螺模拟器具有较高的可靠性和良好的通用性。     

功能化碳纳米管表面高分散的钯纳米粒子在碱性溶液中的甲醇氧化行为

本工作中在水溶液体系中以芳烃重氮盐修饰的多壁碳纳米管(MWNT)为载体构筑了钯(Pd)纳米粒子碳纳米管复合结构。以MWNT的侧壁上C-C共价键接的氨基苯甲酸为沉积活化中心,制备了高分散高催化活性的钯(Pd)纳米粒子。结构成分和形貌分别用XRD和TEM表征。循环伏安(CV) 和交流阻抗的研究表明上述复合结构在碱性溶液中对甲醇的电催化氧化有很高的活性及稳定性。芳烃重氮盐修饰的MWNT是一种非常好的催化剂载体,而Pd-MWNT复合材料在燃料电池有着广泛的应用前景。     

Increasing visible-light absorption for photocatalysis with black BiOCl

Black BiOCl with oxygen vacancies was prepared by UV light irradiation with Ar blowing. The as-prepared black BiOCl sample showed 20 times higher visible light photocatalytic activity than white BiOCl for RhB degradation. The trapping experiment showed that the superoxide radical (O(2)(?-)) and holes (h(+)) were the main active species in aqueous solution under visible light irradiation.     

2,2'-联喹啉-4,4'-二羧酸构筑的一维钴(Ⅱ)配位聚合物

利用2,2'-联喹啉-4,4'-二羧酸钠(Na2bqdc),2,2-联吡啶与硫酸钴在溶剂热作用下合成了1个一维配位聚合物[Co(bqdc)(bipy)(H20)]n(1).通过元素分析、粉末衍射、红外、紫外光谱对配合物进行了表征,利用X射线单晶衍射仪测定了其晶体结构.中心CoⅡ离子分别与2个来自2,2-联喹啉-4,4-二羧酸钠配体的双齿羧基氧原子和1个来自配体的单齿羧基氧原子、辅助配体2,2-联吡啶上的2个N原子和1个水分子的氧原子配位,形成了1个稍微扭曲的八面体配位构型.紫外光谱实验表明,相对2,2'-联喹啉-4,4'-二羧酸钠配体,配合物的紫外光谱发生了少量的蓝移.对该配合物多晶样品的差热分析(TGA)表明该化合物在217℃后开始分解.     

2，2′-联喹啉-4，4′-二羧酸构筑的一维钴(Ⅱ)配位聚合物

利用2,2′-联喹啉-4,4′-二羧酸钠(Na2bqdc),2,2-联吡啶与硫酸钴在溶剂热作用下合成了1个一维配位聚合物[Co(bqdc)(bipy)(H2O)]n(1)。通过元素分析、粉末衍射、红外、紫外光谱对配合物进行了表征,利用X射线单晶衍射仪测定了其晶体结构。中心CoⅡ离子分别与2个来自2,2-联喹啉-4,4-二羧酸钠配体的双齿羧基氧原子和1个来自配体的单齿羧基氧原子、辅助配体2,2-联吡啶上的2个N原子和1个水分子的氧原子配位,形成了1个稍微扭曲的八面体配位构型。紫外光谱实验表明,相对2,2′-联喹啉-4,4′-二羧酸钠配体,配合物的紫外光谱发生了少量的蓝移。对该配合物多晶样品的差热分析(TGA)表明该化合物在217℃后开始分解。     

The effects of different doping patterns on the lattice thermal conductivity of solid Ar

In order to investigate the effects of doping patterns on phonon transport, equilibrium molecular dynamics method is performed to calculate the lattice thermal conductivity of solid argon doped with krypton atoms in different geometrical distribution modes. Four different patterns are introduced through replacing Ar atoms with the same amount of Kr atoms in different volume and positions. The simulation results demonstrate that the impurity volume and distribution have significant effects on phonon transport in a crystal structure. The lowest thermal conductivity among the four doping patterns is achieved by introducing the impurity in a nanometer size cubic pattern distributed in the Ar matrix, which is roughly two times lower than that of pure argon at 17 K. The impurity strength on phonons is estimated through comparing the simulation results with those calculated from the Callaway model.     

掺杂WO3的SiO2/TiO2的溶胶热液合成及光催化性能

采用溶胶-热液合成法制备了掺杂WO₃的SiO₂/TiO₂复合光催化剂,用X射线衍射、红外光谱、Zeta电位分析、BET和透射电镜对样品进行了表征,并以甲基橙降解评价了其光催化性能.结果表明:改性后的光催化剂表现出较高的光催化性能,WO₃和SiO₂不仅增加了锐钛矿TiO₂的稳定性,并阻止了TiO₂晶粒的聚集生长.     

锂负极失效的全固态薄膜锂电池的直接回收再利用

作为微电子器件的理想电源，全固态薄膜锂电池(TFB)已经被广泛地研究了几十年，并开始进入商业化应用。然而，目前关于失效TFB的回收与再利用的研究几乎没有，这将会阻碍TFB的可持续发展。本工作针对因金属锂负极失效而造成电池失效的TFB，提出了一种简单的基于最常见LiCoO₂ (LCO)/LiPON/Li TFB (F-TFB)的直接回收再利用的方法。研究发现，F-TFB中的金属锂负极薄膜在循环过程会被部分氧化从而造成电池失效。我们提出利用无水乙醇溶液有效地溶解并去除F-TFB上失效的金属锂负极部分，从而快速地回收底层的LCO/LiPON薄膜。结构分析和表面分析结果表明，回收的LCO/LiPON薄膜中的LCO正极的晶体结构、LCO/LiPON的界面结构以及LiPON电解质的表面保持完好，使其再利用成为了可能。进一步地，我们在回收的LCO/LiPON薄膜上依次沉积了LiPON和Li薄膜，构建得到了电化学性能恢复的LCO/LiPON/Li TFB，并获得了与新制备的TFB相一致的比容量(0.223 mAh∙cm⁻²)、良好的倍率性能和循环寿命(500次循环后容量保持率为77.3%)。这种简单而有效的回收再利用方法有望延长固态电池的使用寿命，减少能源和资源消耗，促进固态电池的可持续发展。