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Showing 1 to 20 of 43 for “"Polysulfide"”.
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Ionic equilibrium in polysulfide solutions
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1958.
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The preparation of hydrogen polysulfide in the gas phase
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1951
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Aqueous Polysulfide Electrodes for Low-Cost Grid-Scale Energy Storage
… abundance. To this end, an air-breathing aqueous polysulfide redox flow battery was demonstrated as a promising candidate, which pairs a similarly low-cost oxygen electrode with aqueous polysulfide, to meet the criteria for grid storage. Techno-economic modeling shows such a battery has one of the …
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Ionic conductivity and exchange current density of non-aqueous lithium polysulfide electrolyte
Lithium-polysulfide flow batteries, which utilize the high solubility of lithium polysulfide in non-aqueous electrolytes to enable flowable electrodes, have high theoretical energy density and low raw materials cost. To achieve greater electrode-level energy density, higher sulfur concentrations …
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Zirconium-group 13 heterobinmetallic compounds and the synthesis of oxysulfides in sodium polysulfide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Impact of agronomical and technological factors and the oxidative protection of the matrix on polysulfide formation and atypical ageing in wine
… caused by hydrogen sulfide (H2S) resulting from polysulfides (PSs) formation and subsequent degradation and off-odour formation from atypical ageing (ATA) were assessed. In order to improve the analytical detection of PSs in different model wines and musts, an on-line solid phase extraction (SPE) …
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The design of a thiokol plant
… reaction between organic dihalides and inorganic polysulfides. They find wide application where resistance to petroleum oils, organic solvents, and low permeability. The purpose of this investigation was to design a Thiokol with a production of 2000 tons per year. Research was conducted to …
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Water-Soluble Redox Materials and Their Applications in Aqueous Batteries
… acid modified WS2 nanosheets are developed as polysulfide conversion electrocatalysts in alkaline aqueous solutions, which overcome the sluggish reaction kinetics of polysulfide and improve the electrocatalytic activity for polysulfide reactions in aqueous solution. This work opens the way to …
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… was used for operando measurements of polysulfide dissolution in Li-S batteries, which leads to loss of active material and lowers lifetimes. The cell was also used to study electrolyte decomposition in Li-ion batteries, which can lead to thermal runaway and catastrophic failure. An …
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I. An oxygen-17 NMR study on oxygen exchange in yttrium barium(2) copper(3) oxygen(7-x). II. Synthesis of transition metal polysulfide complexes from metal powders
Covellite, $\rm Cu\sp{I}\sb2(S\sb2)Cu\sp{II}S$ (T$\sb{\rm c}$ = 1.66 K) and $\rm YBa\sb2Cu\sp{II}\sb2Cu\sp{III}O\sb{7-x}\ (T\sb{c}$ = 92 K) are similar in that both are superconductors containing layered structures and mixed valent copper centers. Our studies on YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ …
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Interaction between ferric hydroxides and dissolved sulfide in anoxic aquifers: Pathway and kinetics of iron and sulfur products formation
… that not only elemental sulfur but also polysulfides were the main oxidized sulfur products.. The polysulfides, with predominance of disulfide, accumulated mainly at the mineral surface and could be extracted by methanol with an appropriate pre-treatment with zinc acetate. Therefore, the …
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Electrocatalysis In Li-S Batteries
<p>Stabilizing polysulfide-shuttle process while ensuring high sulfur loading holds the key to realize high theoretical energy density (2500 Wh/kg) of lithium-sulfur (Li-S) batteries. Though several carbon based porous materials have been used as host structures for sulfur and its intermediate …
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The synthesis and characterization of sodium polysulfides for Na-S battery application
… energy storage. The characterization of sodium polysulfides in the Na-S battery systems can offer insightful information to understand the electrochemical reaction mechanism of the Na-S batteries and overcome the "inert" nature of short-chain polysulfides (Na2Sn, 1<n<4) during charge and …
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Development and characterization of next generation batteries
… methods. Results show that the lower polysulfide solubility in certain solvate:HFE solutions results in stable cycling and higher capacity as limited crossover of polysulfides generates cleaner Li anodes. Using sparingly solvating electrolyte is efficient in decreasing polysulfide …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΑΠΟΤΥΠΩΤΙΚΗΣ ΙΚΑΝΟΤΗΤΑΣ ΤΩΝ ΕΛΑΣΤΟΜΕΡΩΝ ΑΠΟΤΥΠΩΤΙΚΩΝ ΥΛΙΚΩΝ
… IMPRESSION MATERIALS HAVE BEEN USED, THAT IS, POLYSULFIDE, CONDENSATION AND ADDITION SILICONE AND POLYETHER. THE STUDY OF THE IMPRESSION ABILITY AND ROUGHNESS HAS BEEN MADE WITH THE SCANNING ELECTRONIC MICROSCOPE.
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Sulfur-Based Yolk-Shell Nanoparticles for Lithium Sulfur Batteries
… like the dissolution of the intermediate polysulfide and the large volumetric expansion of the material in the cell upon lithiation (~80%). Sulfur yolk-shell nanostructures were designed to improve the electrical performance of the lithium sulfur batteries. In the initial study, a …
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Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries
… the major product DMTS, the high order organic polysulfide dimethyl tetrasulfide (DMTtS) and low order organic polysulfide dimethyl disulfide (DMDS) are also formed and charged/discharged in the following cycles. With a LiNO3 containing ether-based electrolyte, DMTS cell delivers an initial …
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Kinetics of phase transformations in lithium-sulfur batteries
… with high capacity and rate capability. Polysulfide solutions, intermediates in the electrochemical reduction of sulfur, are used for the first time to make an efficient, high energy density flow battery, enabled by a novel flow battery architecture using a percolating network of …
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A COLLABORATIVE APPROACH TO MATERIALS DISCOVERY FOR WATER SPLITTING PHOTOCATALYSTS AND LITHIUM SULFUR REDOX.
… and detailed electrochemical studies of lithium polysulfides via rotating disk electrode (RDE) voltammetry, we have investigated the kinetics of the redox reactions and explored candidate catalysts to potentially overcome/mitigate the polysulfide shuttle effect. From these RDE studies, supported …
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Identification of battery products and intermediates through NMR spectroscopy
… NMR demonstrate that long-chain, soluble lithium polysulfide species formed at the beginning of discharge are indistinguishable from each other (similar chemical shifts), while short-chain, insoluble polysulfide species that form at the end of discharge (presumably Li2S2 and Li2S) have a different …
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