22868-13-9Relevant articles and documents
CHEMICAL STABILITY OF SODIUM BETA double prime -ALUMINA ELECTROLYTE IN SULFUR/SODIUM POLYSULFIDE MELTS.
Liu,De Jonghe
, p. 741 - 749 (1988)
Immersion of sodium beta double prime -alumina electrolyte in sodium polysulfide and pure sulfur melts, at Na/S Battery operation temperatures, showed that the electrolyte was chemically attacked by the melts,and that the extent of degradation was affected by a number of factors, including surface morphology and chemistry of the electrolyte, melt composition, impurity contamination, etc. The corrsosion reactions mostly initiated and concentrated on defected areas, and were catalyzed by the presence of impurities such as water, moist air, oxygen, etc. The corrosion power of sodium polysulfide melts increased with the sulfur content in the range of Na//2S//2 to Na//2S//5.
Long-Life Room-Temperature Sodium–Sulfur Batteries by Virtue of Transition-Metal-Nanocluster–Sulfur Interactions
Zhang, Bin-Wei,Sheng, Tian,Wang, Yun-Xiao,Chou, Shulei,Davey, Kenneth,Dou, Shi-Xue,Qiao, Shi-Zhang
, p. 1484 - 1488 (2019)
Room-temperature sodium–sulfur (RT-Na/S) batteries hold significant promise for large-scale application because of low cost of both sodium and sulfur. However, the dissolution of polysulfides into the electrolyte limits practical application. Now, the design and testing of a new class of sulfur hosts as transition-metal (Fe, Cu, and Ni) nanoclusters (ca. 1.2 nm) wreathed on hollow carbon nanospheres (S@M-HC) for RT-Na/S batteries is reported. A chemical couple between the metal nanoclusters and sulfur is hypothesized to assist in immobilization of sulfur and to enhance conductivity and activity. S@Fe-HC exhibited an unprecedented reversible capacity of 394 mAh g?1 despite 1000 cycles at 100 mA g?1, together with a rate capability of 220 mAh g?1 at a high current density of 5 A g?1. DFT calculations underscore that these metal nanoclusters serve as electrocatalysts to rapidly reduce Na2S4 into short-chain sulfides and thereby obviate the shuttle effect.
Synthesis, structure, magnetic and optical properties of ternary thio-germanates: Ln4(GeS4)3 (Ln = Ce, Nd)
Choudhury, Amitava,Dorhout, Peter K.
, p. 649 - 656 (2008)
Single crystals of two ternary thio-germanates containing rare-earth metals, Ln4(GeS4)3 (Ln = Ce (I), Nd (II)), have been isolated from the reaction of anhydrous rare-earth trichloride (LnCl 3) and ternary sodium thio-germanate (Na2GeS3) in evacuated quartz ampoules. We have determined the crystal structure of the compounds, which are isostructural to La4(GeS4) 3 and crystallize in trigonal system in the space group R3c with the cell dimensions: I, a = b = 19.375(3)A, c = 8.028(2) A, Z = 6; II, a = b = 19.250(3) A, c = 7.949(2) A, Z = 6. The structure is built with the complex network of two independent tricapped trigonal prisms of CeS9, in which Ge atoms occupy tetrahedral holes of sulfur atoms. The bulk synthesis of the two compounds has also been achieved by the stoichiometric combination of the elements. The magnetic and optical properties of the compounds have been investigated. The magnetic moments of 2.32 and 3.49 μB for I and II, respectively, are in good agreement with the theoretical magnetic moments of Ce and Nd in the +3 oxidation state. The optical band gap of I is found to be located around 2.3 eV, while the optical band gap of II lies around 2.62 eV. In addition, Raman spectroscopic characterizations have also been performed for I, II, and La4(GeS4)3.
Ternary lanthanum sulfide selenides α-LaS2-xSex (022- (X=S, Se)
Bartsch, Christian,Doert, Thomas
, p. 101 - 106 (2012)
Mixed lanthanum sulfide selenides LaS2-xSex (02-xSex compounds crystallize in space group P2 1/a, no. 14, and adopt the α-LnS2 (Ln=Y, LaLu) structure type with a pronounced site preference for the chalcogen atoms. The mixed chalcogenides form a complete miscible series with lattice parameters a=820849 pm, b=413425 pm and c=822857 pm (β≈90°) following Vegard's rule. Raman signals indicate the presence of mixed X22- dianions, a species rarely evidenced in literature, besides the well known anions S22- and Se22-. The band gaps of the LaS2-xSex compounds, determined by optical spectroscopy, decrease nearly linearly with increasing amount of selenium.
Microwave-assisted synthesis, characterization, and thermal decomposition of rare-earth metal disulfides RES2 (RE = La, Pr, Nd)
Bartsch, Christian,Ahrens, Eike,Doert, Thomas
, p. 2491 - 2497 (2012)
Microwave-assisted metathesis reactions from anhydrous rare-earth metal trichlorides and alkali metal polychalcogenides in dimethylformamide in the temperature interval 160 °C ≤ T ≤ 220 °C yield sub-micron and nanometer scaled particles of the rare-earth
Poly(butylene disulfide) and poly(butylene tetrasulfide): Synthesis, cure and investigation of polymerization yield and effect of sulfur content on mechanical and thermophysical properties
Sheydaei, Milad,Edraki, Milad,Javanbakht, Shiva,Alinia-Ahandani, Ebrahim,Soleimani, Mahdieh,Zerafatkhah, Alireza
, p. 578 - 584 (2021/01/21)
In this work, two polysulfide polymers were synthesized by use of 1,4-dichlorobutane and aqueous sodium disulfide or sodium tetrasulfide. The polymers were cured at 85 °C. The structural characteristics of non-cured and cured samples were identified by Raman and FT-IR spectroscopy. The morphological and the thermophysical properties of all samples were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Also, the mechanical properties and hardness of all samples were investigated by tensile test and Shore A. Moreover, the effects of temperature and ethanol on polymerization were investigated. Aqueous monomers were characterized by UV-VIS-NIR spectroscopy. The molecular weight of the synthesized samples was determined by 1H NMR spectroscopy. The results showed that, before curing, poly(butylene tetrasulfide) (PBTS) due to amorphous structure does not have a melting peak and both polymers have a very low glass transition temperature. Without ethanol, no polymerization reaction takes place. Before curing, poly(butylene disulfide) (PBDS) is brittle and PBTS has an elastomeric behavior, but after curing PBDS also behaves as elastomer. The curing times of the two polymers are close to each other, but their mechanical properties and hardness are different.
Preparation method of diethyl disulfide
-
Paragraph 0010; 0013-0015, (2020/06/02)
The invention relates to a preparation method of diethyl disulfide, comprising the following steps: using sodium sulfide, sulfur and diethyl sulfate as raw materials, carrying out stirring reaction at60-70 DEG C for 3-5 hours under the action of a phase transfer catalyst, and carrying out after-treatment on the reaction solution after the reaction is finished. According to the method, diethyl sulfate is used as an ethylation reagent, the cost is low, the reaction is easy to operate, the production period is short, and the ethyl utilization rate is high.
