Month: December 2022

Song, Mengyuan published the artcileTetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium-oxygen batteries, Application of 2,5,8,11,14-Pentaoxapentadecane, the main research area is tetramethylpyrazine electrolyte lithium oxygen battery energy efficiency.

Lithium-oxygen batteries have attracted great attention in recent years owing to their extremely high theor. energy d., however, factors such as low actual capacity and poor rate performance hinder the practical application of lithium-oxygen batteries. In this work, a novel electrolyte additive, tetramethylpyrazine (TMP), is introduced into an electrolyte system to enhance the electrochem. performance of the lithium-oxygen batteries. TMP does not undergo its own redox reaction within the charge-discharge voltage range, which will not affect the electrochem. stability of the electrolyte. The results show that the addition of TMP can increase the reduction current of oxygen, which will promote the ORR process, and with an optimal TMP content (50 mM), the cell shows a high discharge capacity of 5712.3 mA h g-1 at 0.1 mA cm-2. And its rate capability is almost doubled compared with the system without TMP additive at a large c.d. of 1 mA cm-2. Further anal. by SEM and XRD reveals that the addition of TMP can reduce the formation of byproducts and promote the solution growth of large-size Li2O2 particles to achieve a large discharge capacity. This approach could provide a new idea for improving the electrochem. performance of lithium-oxygen batteries.

RSC Advances published new progress about Basicity. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Bennett, Ellie published the artcileSize Dependent Optical Properties and Structure of ZnS Nanocrystals Prepared from a Library of Thioureas, SDS of cas: 143-24-8, the main research area is optical absorption zinc sulfide nanocrystal thiourea precursor size.

ZnS nanocrystals (λmax(1Se-1S3/2h) = 260-320 nm, d = 1.7-10.0 nm) are synthesized from Zn(O2CR)2 (O2CR = tetradecanoate, oleate and 2-hexyldecanoate), N,N′-disubstituted and N,N′,N′-trisubstituted thioureas, and P,P,N-trisubstituted phosphanecarbothioamides. The influence of precursor substitution, ligand sterics, and reaction temperature on the final nanocrystal size was evaluated. Using saturated hydrocarbon solvents and saturated aliphatic carboxylate ligands, polymeric byproducts could be avoided and pure ZnS nanocrystals isolated. Elevated temperatures, slower precursor conversion reactivity, and branched zinc 2-hexyldecanoate yield the largest ZnS nanocrystals. Carefully purified zinc carboxylate, rapidly converting precursors, and cooling the synthesis mixture following complete precursor conversion provide quasispherical nanocrystals with the narrowest shape dispersity. Nanocrystal sizes were measured using pair distribution function (PDF) anal. of X-ray scattering and scanning transmission electron microscopy (STEM) and plotted vs. the energy of their first excitonic optical absorption. The resulting empirical relationship provides a useful method to characterize the nanocrystal size from 1.7 to 4.0 nm using optical absorption spectroscopy.

Chemistry of Materials published new progress about Band gap. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, SDS of cas: 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Liu, Weiwei published the artcileLight-Assisted Li-O2 Batteries with Lowered Bias Voltages by Redox Mediators, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is redox mediator lithium oxygen battery bias voltage; bias voltage; lithium-oxygen batteries; photocatalysts; photogenerated holes and electrons; redox mediators.

The enormous overpotential caused by sluggish kinetics of the oxygen reduction reaction and the oxygen evolution reaction prevents the practical application of Li-O2 batteries. The recently proposed light-assisted strategy is an effective way to improve round-trip efficiency; however, the high-potential photogenerated holes during the charge would degrade the electrolyte with side reactions and poor cycling performance. Herein, a synergistic interaction between a polyterthiophene photocatalyst and a redox mediator is employed in Li-O2 batteries. During the discharge, the voltage can be compensated by the photovoltage generated on the photoelectrode. Upon the charge with illumination, the photogenerated holes can be consumed by the oxidization of iodide ions, and thus the external circuit voltage is compensated by photogenerated electrons. Accordingly, a smaller bias voltage is needed for the semiconductor to decompose Li2O2, and the potential of photogenerated holes decreases. Finally, the round-trip efficiency of the battery reaches 97% with a discharge voltage of 3.10 V and a charge voltage of 3.19 V. The batteries show stable operation up to 150 cycles without increased polarization. This work provides new routes for light-assisted Li-O2 batteries with reduced overpotential and boosted efficiency.

Small published new progress about Band gap. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Dutta, Prasit Kumar published the artcileMechanism of Na-Ion Storage in BiOCl Anode and the Sodium-Ion Battery Formation, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is bismuth oxychloride anode Prussian blue cathode sodium ion battery.

We systematically unravel the mechanism by which sodium ion reacts electrochem. with ionically layered BiOCl nanosheets. Solution-processed BiOCl nanosheets were cycled using slow scan cyclic voltammetry (50 μV s-1) to reach the desired reaction voltages. Characterizations using in situ impedance spectroscopy and ex situ X-ray diffraction, Raman spectroscopy, and transmission electron microscopy are used to map the mechanism of Na-ion insertion and deinsertion in BiOCl nanosheets. It was found that BiOCl initially undergoes a conversion reaction to form metallic Bi. The metallic Bi further alloys with sodium ion to form Na3Bi and NaBi, a compound whose formation has not been reported before. We also detect the formation of BiO, Na3BiO4, and NaBiO3. Finally, BiOCl is used as anode against a Prussian blue cathode to prepare a full cell that is capable of providing an average discharge potential of ∼2.2 V at the 100th cycle. The overall study reveals new insights and key differences in the mechanism of sodium-based electrochem. energy storage systems.

Journal of Physical Chemistry C published new progress about Alloying. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Gyori, Eniko published the artcileSupercritical CO2 extraction and selective adsorption of aroma materials of selected spice plants in functionalized silica aerogels, Product Details of C11H16O2, the main research area is supercritical CO2 extraction squalene spathulenol adsorption silica aerogel.

Static supercritical fluid extraction has been used to concentrate the aroma materials of common herbs and spices. The technique has provided a higher number of components and cleaner extract than the one-step ethanol maceration. The one-step supercritical fluid extraction of the aroma compounds has been combined with their in situ adsorption in hydrophilic and hydrophobic silica aerogels. The extracts have been analyzed by a GC-MS technique and 55 aroma compounds have been identified. Most of the compounds have been adsorbed in both polar and apolar silica aerogels with no direct connection with the surface polarity. However, previously undetected compounds enriched to an anal. significant level, while others competed with each other for the active sites on the surface. Functionalized silica aerogels can be used as a new type of aroma storage materials and as selective and tuneable adsorbents for the extraction and enrichment of potentially active components from a complex matrix.

Journal of Supercritical Fluids published new progress about Aerogels. 121-00-6 belongs to class ethers-buliding-blocks, name is 4-Hydroxy-3-tert-butylanisole, and the molecular formula is C11H16O2, Product Details of C11H16O2.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Xing, Wei published the artcileRevealing the impacting factors of cathodic carbon catalysts for Li-CO2 batteries in the pore-structure point of view, Application of 2,5,8,11,14-Pentaoxapentadecane, the main research area is impact cathodic carbon catalyst lithium dioxide battery pore structure.

Li-CO2 battery is a very promising power source with high energy d. Its performance is strongly restricted by the cathode catalysts, in which C-based catalysts were mostly studied. However, the impacting factors on the performance of C catalysts is not yet elucidated. Here, the authors employed a variety of C materials with different pore-structure features as the cathode catalysts of Li-CO2 batteries to reveal which are the main influencing factor on the catalytic performance of C catalysts. Suitable pore shape (most important), large pore size and high surface area are crucial factors to the catalytic performance of C catalysts. This finding is of great significance to the further development of Li-CO2 batteries.

Electrochimica Acta published new progress about Aerogels. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Blanco-Zubiaguirre, L. published the artcileTarget and suspect screening of substances liable to migrate from food contact paper and cardboard materials using liquid chromatography-high resolution tandem mass spectrometry, Computed Properties of 121-00-6, the main research area is food contact paper cardboard substance migration LC HRMS; Food contact paper and board materials; Liquid chromatography-high resolution mass spectrometry; Migration; Quantitative target analysis; Suspect screening; Tenax®.

This work describes the anal. of both target and non-target compounds in paper and cardboard materials together with the characterization of their migration to Tenax by means of liquid chromatog. coupled to both low (LC-QqQ) and high resolution tandem mass spectrometry (LC-q-Orbitrap), resp. To this aim, an entire anal. procedure was fully developed and validated for both matrixes: paper/cardboard and Tenax. A total of 97 chems., including photoinitiators, phthalates, biocides, antioxidants, etc., listed by the European Regulation, were found in the materials under study together with other substances not included in this list. Moreover, the majority of annotated substances were present in the simulant, giving evidence of their migration capacity. Migration percentages of 10 photoinitiators, 4 phthalates, bisphenol A, bis-(2-ethylhexyl) adipate, acetyltributyl citrate and caprolactam to Tenax were quantified. Despite not exceeding the established specific migration limit (SML) in any case, benzophenone, 4-phenylbenzophenone and bisphenol A concentrations in some paper and cardboard materials were very close to the SML values established by the EU legislation.

Talanta published new progress about Diffusion. 121-00-6 belongs to class ethers-buliding-blocks, name is 4-Hydroxy-3-tert-butylanisole, and the molecular formula is C11H16O2, Computed Properties of 121-00-6.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Grundy, Lorena S. published the artcileImpact of frictional interactions on conductivity, diffusion, and transference number in ether- and perfluoroether-based electrolytes, Related Products of ethers-buliding-blocks, the main research area is lithium tetraglyme perfluoroether mol interaction electrolyte ionic conductivity thermodn.

There is growing interest in fluorinated electrolytes due to their high-voltage stability. We use full electrochem. characterization based on concentrated solution theory to investigate the underpinnings of conductivity and transference number in tetraglyme/LiTFSI mixtures (H4) and a fluorinated analog, C8-DMC, mixed with LiFSI (F4). Conductivity is significantly lower in F4 than in H4, and F4 exhibits neg. cation transference numbers, while that of H4 is pos. at most salt concentrations By relating Stefan-Maxwell diffusion coefficients, which quantify ion-solvent and cation-anion frictional interactions, to conductivity and transference number, we determine that at high salt concentrations, the origin of differences in transference number is differences in anion-solvent interactions. We also define new Nernst-Einstein-like equations relating conductivity to Stefan-Maxwell diffusion coefficients In H4 at moderate to high salt concentrations, we find that all mol. interactions must be included. However, we demonstrate another regime, in which conductivity is controlled by cation-anion interactions. The applicability of this assumption is quantified by a pre-factor, β±, which is similar to the “”ionicity”” pre-factor that is often included in the Nernst-Einstein equation. In F4, β± is unity at all salt concentrations, indicating that ionic conductivity is entirely controlled by the Stefan-Maxwell diffusion coefficient quantifying cation-anion frictional interactions.

Journal of the Electrochemical Society published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Related Products of ethers-buliding-blocks.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem