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An integrated approach to configure rGO/VS_(4)/S composites with improved catalysis of polysulfides for advanced lithium-sulfur batteries

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Chinese Chemical Letters 2022年第8期33卷 3909-3915页

作者： Feng Li Lu Wang Guangmeng Qu Peiyu Hou Linglong Kong Jinzhao Huang Xijin Xu School of Physics and Technology University of JinanJi'nan 250022China College of Chemistry and Material Science Shandong Agricultural UniversityTaian 271018China State Forestry and Grassland Administration Key Laboratory of Silviculture in Downstream Areas of the Yellow River School of ForestryShandong Agricultural UniversityTaian 271018China

Lithium-sulfur(Li-S)battery is labeled as a promising high-energy-density battery system,but some inherent drawbacks of sulfur cathode materials using relatively complicated techniques impair the practical ***,an integrated approach is proposed to fabricate the high-performance rGO/VS_(4)/S cathode composites through a simple one-step solvothermal method,where nano sulfur and VS_(4) particles are uniformly distributed on the conductive rGO *** and sulfiphilic VS_(4)provide electron transfer skeleton and physical/chemical anchor for soluble lithium polysulfides(LiPS).Meanwhile,VS_(4) could also act as an electrochemical mediator to efficiently enhance the utilization and reversible conversion of ***,the rGO/VS_(4)/S composites maintain a high reversible capacity of 969 mAh/g at 0.2 C after 100 cycles,with a capacity retention rate of 82.3%.The capacity fade rate could lower to 0.0374%per cycle at 1 ***,capacity still sustains 795 m Ah/g after 100 cycles in the relatively high-sulfurloading battery(6.5 mg/cm^(2)).Thus,the suggested method in configuring the sulfur-based composites is demonstrated a simple and efficient strategy to construct the high-performance Li-S batteries.

关键词： Lithium-sulfur batteries rGO/VS_(4)/S composites In-situ synthesis adsorbing Catalysis

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Defluorination of Wet-Phosphoric Acid： Equilibrium and Kinetic Studies

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Journal of Chemistry and Chemical Engineering 2014年第2期8卷 204-213页

作者： Hayet Omri Narjés Harrouch Batis Unity of Research of Elaboration of Nano-materials and Their Applications National Institute of Applied Sciences and TechnologyUniversity of Carthage Tunis 676-1080 Tunisia

This study describes the advantages of using iron-oxide-pillared MF （montmorillonite） and EDTA （ethylenediaminetetraacetic acid）-pillared MD （montmorillonite） for the removal of fluoride in the phosphoric acid. The MF and MD were characterized by using BET （Brunauer-Emmett-Teller） and SEM （scanning electron microscope） for there to appreciate their textural and structural properties and in order to appraise their capacity in the fixation of the fluorine experimental results of fluorine adsorption show a defluoration of the phosphoric acid passing beyond 90% with both clays with a light performance for the MD. The kinetics of fluorine adsorption on MF and on MD has been measured at different temperatures. Indeed, the adsorbed quantity increases more favorably to temperatures more high. This kinetics could be described by two models： pseudo-first-order or pseudo-second-order, which depends on temperature and the nature of adsorbent. At different temperatures used and with various adsorbents （MD and MF, the pseudo second order model was the most reliable to determine the order of kinetics of adsorption of fluorine, which is also reflected a good correlation coefficient （above 0.99）. The fluoride sorption was reasonably explained with Langmuir or Freundlich isotherms. Thermodynamic parameters such as AG~, AH~, AS~ and kinetic one E,, （apparent activation energy） were calculated in order to understand the nature of sorption process. Results indicate that the mechanism of adsorption of the ion of fluoride on the pillared montmorillonite is an exothermic reaction. During equilibrium conditions, both the systems showed negative Gibbs energy, which indicates stability of system. The values of apparent activation energy for the both clays show that the adsorption of F ions is easier on the MF.

关键词： Phosphoric acid adsorbing defluoration montmorillonite kinetic.

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