Nanoarray Architecture of Ultra-Lithiophilic Metal Nitrides for Stable Lithium Metal Anodes

Lithium metal anode (LMA) is puzzled by the serious issues corresponding to infinite volume change and notorious lithium dendrite during long-term stripping/plating process. Herein, the transition metal nitrides array with outstanding lithiophilicity, including CoN, VN, and Ni₃N, are decorated onto carbon framework as “nests” to uniform Li nucleation and guide Li metal deposition. These transition metal nitrides with excellent conductivity can guarantee the fast electron transport, therefore maintain a stable interface for Li reduction. In addition, the designed multi-dimensional structure of metal nitride array decorated carbon framework can effectively regulate the growth of Li metal during the stripping/plating process. Of note, attributing to the lattice-matching between CoN and Li metal, the composite Li/CoN@CF anode exhibits ultra-stable cycling performance in symmetrical cells (over 4000 h@1 mA cm⁻² with 1 mAh cm⁻² and 1000h@20 mA cm⁻² with 20 mAh cm⁻²). The assembled full cells based on Li/CoN@CF composite anode, LiFePO₄ or S as cathodes, deliver excellent cycling stability and rate capability. This strategy provides an effective approach to develop a stable lithium metal anode for lithium metal batteries.     

溶剂气浮分离技术进展

论述了溶剂气浮分离技术研究现状,对所涉及的工艺和设备等关键问题进行了重点论述,展望了利用溶剂气浮法分离有机物稀溶液的工业化应用前景及研究重点.     

离子膜装置运行中几个问题的探讨

介绍了离子膜装置中在树脂塔、电解槽、淡盐水pH值及碱中含盐等方面出现的异常情况及造成的后果，并提出了处理方法。     

低品位铜矿生产氧化铜的工艺研究

介绍一抑利用复杂组份的低品位铜矿生产氧化铜产品的工艺。此工艺适应的原料广泛，能充分利用铜矿资源，生产技术指标稳定，操作方便等特点。     

一种新型连续供料气力输送装置

针对传统仓式泵的缺点 ,介绍了一种能连续供料的新型气力输送设备。并对该设备进行了周期供料与连续供料试验研究 ,结果表明该设备能实现连续供料 40min ,连续输送仓式泵的产量比同规格的单仓泵高 30 %左右。     

三次风炉外分离技术在低氮燃烧改造中的研究与应用

针对某电厂330 MW四角切圆中间储仓式热风送粉锅炉NO_x生成浓度高的问题,分析了三次风对NO_x生成的影响,优化了燃烧系统关键部件,整体上采用一次风水平浓淡低氮燃烧器+三次风炉外分离+空气分级技术的改造方案,针对NO_x生成影响较大的三次风采用了炉外分离+垂直空间分级送入技术。实际运行表明,改造后锅炉NO_x生成量明显减少,锅炉燃烧、运行稳定,锅炉效率不降低。     

甲醇制烯烃装置催化剂跑损的研究

对甲醇制烯烃装置反应器和再生器催化剂跑损原因进行分析,利用装置DCS在线参数及离线分析数值的相关参数,对催化剂跑损量进行定量计算,探讨稀相密度值与催化剂跑损的联系,提出预防催化剂跑损的建议,对催化剂跑损研究具有一定指导意义。     

Li3AlN2—a self‐activated yellow light emitting wide‐bandgap semiconductor used for LEDs

In allusion to the problems existing in the defect‐related luminescent materials, a series self‐activated light emitting semiconductors of Li₃AlN₂: R (R=0, Na⁺, Mg²⁺, Si⁴⁺, Tb³⁺, Eu³⁺) have been successfully synthesized by sample‐pressure sintering. Under the excitation at 422 nm, a yellow light peaked at 580 nm have been observed in the host lattice of Li₃AlN₂. The crystal structure and the electron structure of Li₃AlN₂ have been measured to investigate the defect‐related luminescent properties of Li₃AlN₂ using the Rietveld refinement on the basic of X‐ray diffraction data and the density functional theory (DET). The results show that Li₃AlN₂ crystallizes in cubic phase with full filled edge‐shared (Al/Li)N₄ tetrahedrons and is a wide‐bandgap semiconductor. The impurity defects produced by ions substitution have also been investigated, which leads to the red‐shift of the emission peak. Finally, the photoluminescence excitation (PLE) spectrum of Li₃AlN₂ with two excitation bands peaked at 300 nm and 422 nm has been detected, and the latter matches well with near‐UV LED chips. The thermal stability shows that integral intensity of Li₃AlN₂ at 150°C still has 60% of the initial intensity at room temperature. The results indicate their potential applications as the LED used phosphors.     

Manganese and chromium doping in atomically thin MoS2

Recently, two-dimensional materials have been attracting increasing attention because of their novel properties and promising applications. However, the impurity doping remains a significant challenge owing to the lack of the doping strategy in the atomically thin layers. Here we report on the chromium (Cr) and manganese (Mn) doping in atomically-thin MoS₂ crystals grown by chemical vapor deposition. The Cr/Mn doped MoS₂ samples are characterized by a peak at 1.76 and 1.79 eV in photoluminescence spectra, respectively, compared with the undoped one at 1.85 eV. The field-effect transistor (FET) devices based on the Mn doping show a higher threshold voltage than that of the pure MoS₂ while the Cr doping exhibits the opposite behavior. Importantly, the carrier concentration in these samples displays a remarkable difference arising from the doping effect, consistent with the evolution of the FET performance. The temperature-dependent conductivity measurements further demonstrate a large variation in activation energy. The successful incorporation of the Mn and Cr impurities into the monolayer MoS₂ paves the way towards the high Curie temperature two-dimensional dilute magnetic semiconductors.     

通风与TiO2涂料光催化治理室内污染物的研究

将通风工程技术和室内污染控制技术相结合,通过模拟室内环境条件,研究了紫外光照射时,上送上排、上送下排和置换通风三种不同通风方式下,室内环境中涂有二氧化钛涂料时,对甲醛的去除作用。实验结果表明：在不同的送风量条件下,有紫外光照射时,二氧化钛涂料在置换通风方式下对室内甲醛的降解效果相对较好。