Co‐doped silica sol solutions with varying Co composition (Co/(Si+Co)=10–50 mol%) were prepared from tetraethoxysilane and Co(NO 3 ) 2 ·6H O. Subsequently, these used in the preparation of hydrogen separation microporous membranes enhanced hydrothermal stability at 500°C under a steam pressure 300 kPa. At concentrations >33%, XRD pattern peak intensity preparations similar not dependent on composition, suggesting that was incorporated into network. The best H permeation performance...

Results of theoretical calculations are reported, examining the effect a coherent twin boundary on electrical properties LiCoO(2) . This study suggests that internal interfaces in strongly affect battery voltage, capacity, and power density this material, which is particular concern if it used all-solid-state Li-ion batteries.

Despite the great progress that has been accomplished in supercapacitors, imbalance of development positive and negative electrode materials still remains a critical issue to achieve high energy density; therefore, exploring high-performance is highly desirable. In this article, three-dimensional cobalt phosphide (CoP) nanowire arrays were synthesized on carbon cloth utilized as binder-free supercapacitor electrode. The as-synthesized CoP presented capacitance 571.3 mF/cm2 at current density...

Lanthanum lithium titanate (LLTO) is one of the most promising electrolyte materials for all-solid-state lithium-ion batteries. Despite numerous studies, detailed crystal structure still open to conjecture because difficulty identifying precisely positions Li atoms and distribution intrinsic cation vacancies. Here we use subangstrom resolution scanning transmission electron microscopy (STEM) imaging methods spatially resolved energy loss spectroscopy (EELS) analysis examine local atomic...

In order to find relationships among the atomic structure, electronic and defect energetics, $[001](310)\ensuremath{\Sigma}5$ grain boundaries (GBs) of ${\text{SrTiO}}_{3}$ ${\text{BaTiO}}_{3}$ were investigated by using first-principles calculations high-resolution scanning transmission electron microscopy. It was found that rigid-body translations one with respect other are indispensable obtain stable GB translation plays an important role reduce structural distortions such as dangling...

Atomic-resolution STEM and EELS analysis provide insights into microscopic mechanisms behind oxygen loss capacity fade in spinel-structured lithium-ion battery cathode material LiMn₂O₄.

Perovskite-type lanthanum lithium titanate (LLTO) is attracting extensive interest because of its high intrinsic ionic conductivity. The material exhibits a complex microstructure with domains various sizes and orientations that vary the content. Based on systematic examination both Li-poor Li-rich LLTO compounds using state-of-the-art scanning transmission electron microscopy (STEM), we reveal structures composition domain boundaries (DBs) consider their effect Li-ion mobility conductivity,...

The direct observation of light elements such as Li is a challenge even for state-of-the-art electron microscopy techniques because scatter electrons only weakly. Using the annular bright field scanning transmission imaging technique, we have simultaneously visualized columns Li, O, and Co ions in lithium-ion battery cathode material LiCoO2, which one most important materials industrial applications. image exhibits good signal-to-noise ratio contrast not reversed specimen thickness changes....

PEDOT coated iron phosphide nanorod arrays are synthesized and demonstrated as high-performance negative electrodes for supercapacitors with high areal specific capacitance significantly improved cycling stability. A MnO2//FeP/PEDOT aqueous asymmetric supercapacitor is fabricated a volumetric of 4.53 F cm-3 an energy density 1.61 mW h cm-3.

Abstract A facile synthesis of a new class reactive porous materials is reported: hierarchically hydrogen silsesquioxane (HSiO 1.5 , HSQ) monoliths with well‐defined macropores and mesopores. The HSQ are prepared via sol‐gel accompanied by phase separation in mild condition, contain micrometer‐sized co‐continuous high specific surface area reaching up to 800 m 2 g −1 because the small total preservation Si–H, which always an issue materials, confirmed 29 Si solid‐state NMR. monolith has then...

Lithium lanthanum titanate (LLTO) is one of the promising solid-state Li-ion electrolytes for an all-solid-state battery system. Although LLTO shows a significantly high conductivity 2.2 × 10−3 S cm−1 in bulk, at grain boundary largely reduced to 4.2 10−5 cm−1, which prevents practical application electrolytes. To solve this problem, origin such low should be clarified. In study, we investigated relationship between and geometric structure (Li0.33La0.56)TiO3 polycrystal by using...

Spinel LiMn2O4 is an attractive lithium-ion battery cathode material that undergoes a complex series of structural changes during electrochemical cycling lead to rapid capacity fading, compromising its long-term performance. To gain insights into this behavior, in report we analyze epitaxial thin films the first few charge-discharge cycles with atomic resolution and correlate them properties. Impedance spectroscopy scanning transmission electron microscopy are used show defect-rich surfaces...

A novel preceramic polymer suitable to form a SiBCN ceramic was synthesized by hydroboration reaction of 1,3,5-trivinyl-1,3,5-trimethyl-cyclotrisilazane with borane dimethylsulphide. The obtained denoted as poly(borosilazane) characterised FT-IR and NMR spectroscopy its thermal stability studied gravimetric analysis in combination situ mass spectrometry (TG/MS). polymer-to-ceramic transformation achieved at 1050°C inert argon atmosphere yielding black X-ray amorphous ceramics thermally...

Supported metal alloy nanoparticles demonstrate high potential in designing heterogeneous catalysts for organic syntheses, pollution control and fuel cells. However, requirements of temperature multistep processes remain standing problems traditional synthetic strategies. We herein present a low-temperature, single-step, liquid-phase methodology monolith-supported with physicochemical stability accessibility. Metal ions aqueous solutions are reduced to form their corresponding within...

Titanium dioxide (TiO2) nanorod arrays grown directly on Ti metal foil were prepared by a facile one-step hydrothermal method, in which the serves as both substrate and precursor. The nanorods are tetragonal rutile single crystal with growth orientation along [001] direction. electrochemical properties of TiO2 systematically investigated cyclic voltammetry, galvanostatic charge/discharge impedance spectroscopy using three-electrode system. As result, exhibit good areal specific capacitance...

High-quality thin films of cathode material LiCoPO₄ are analyzed using a combination STEM-EELS, XRD, and atomistic simulations. Capacity fade during cycling is accompanied by formation large numbers cation exchange defects, especially at surfaces, blocking the preferred Li-ion migration pathways.

A novel sol-gel-derived preceramic polymer, namely poly(organosilyl)carbodiimide, was synthesized for fabrication of thermally stable amorphous Si-C-N membranes. The gelation process as well the viscosity poly(organosilyl)carbodiimide adjusted spin coating by reacting a mixture alkyl and dialkyl chlorosilane monomers with bis(trimethylsilyl)carbodiimide. polymeric precursor film successfully fabricated on porous substrate solvent-free coating, subsequently converted into mesoporous thin...