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Flower-like MoS2 supported on three-dimensional graphene aerogel (MoS2/GA) composite has been prepared by a facile hydrothermal method followed by subsequent heat-treatment process. Each of MoS2 microflowers is surrounded by the three-dimensional graphene nanosheets. The MoS2/GA composite is applied as an anode material of sodium-ion batteries (SIBs) and it exhibits high initial discharge/charge capacities...
Magnesium (Mg) electrolytes are presently under investigation for their promising performance capabilities in the next generation of batteries. The present work studies Mg-ion transport in polymers using different types of Mg salts. Polymer electrolytes comprising poly(ethylene carbonate) (PEC) with Mg salts (MgX2; X = TFSI, ClO4) were prepared by solution casting. The structural, thermal, and electrochemical...
Compact-structured silicon/carbon composites consisting of silicon, graphite, and coal tar pitch pyrolysis carbon are prepared via two heating procedures after liquid solidification. The first heating procedure plays a key role in the formation of compact-structured silicon/carbon composites, in which the coal tar pitch has a good fluidity at 180 °C above the softening temperature, and it is easy...
Red phosphorus (RP) is considered to be one of the promising anode materials for lithium-ion batteries (LIBs) on account of its high theoretical capacity (2596 mAh g−1), abundant resources, and environmental friendliness. However, the intrinsic insulating nature and large volume change during lithium insertion/extraction process lead to drastic capacity loss upon cycling. Recently, great attention...
Studies on magnesium ion conducting blend polymer electrolyte (BPE) at room temperature are reported. BPE films of optimized 92.5PVA:7.5PAN ratio in view of its maximum conductivity with various concentrations of magnesium salt—Mg(NO3)2—of different molar mass percentages (0.1, 0.2, 0.3, and 0.4 m.m.%) have been prepared using solution-casting technique with dimethylformamide (DMF) as solvent. The...
The aim of the work was to synthesize nanocomposite membranes based on sulfonated chitosan and PEO blends containing sulfonated silica dioxide (s-SiO2) nanoparticles and investigated their morphological, structural, mechanical, and thermal properties. The electrolytes were characterized by SEM, FTIR, XRD, TG analysis, and water contact angle. FTIR analysis confirmed the presence of chitosan, PEO,...
This paper reports the use of silver-reduced graphene oxide (rGO) films as counter electrode in a dye-sensitized solar cell (DSSC). The effect of silver content in terms of silver nitrate (AgNO3) concentration on the properties of rGO and photovoltaic parameters of the device has been investigated. The samples are crystalline with the existence of GO and silver phases. The samples comprise of conductive...
In the present work, zinc oxide (ZnO) nanoparticles (NPs) have been synthesized at room temperature using co-precipitation method for the use as an electrode material by forming a composite with activated charcoal (AC) powder for its application in electrochemical supercapacitor. For synthesizing of ZnO nanoparticles, dry zinc chloride (ZnCl2) and sodium hydroxide (NaOH) have been used as the initial...
The Ga-Ag-Li|Li7La3Zr1.89Al0.15O12|(Li2O–B2O3–V2O5 + Fe) all-solid-state electrochemical cell has been designed with a simple sintering process. The Li7La3Zr1.89Al0.15O12 solid electrolyte was prepared by sol-gel method. The lithium borovanadate glass was obtained by a convenient melt quenching technique. Cycliс voltammetry has shown that the current densities of the cell at 300 °C can reach several...
Graphene oxide (GO) was synthesized by an improved Hummers method and then reduced with NaBH4; GO became rGO with regular layered structure. Polyaniline (PANI)/rGO composite was prepared by a adsorption double oxidant method with rGO as a template. Some physical characterization methods (Fourier transform infrared spectroscopy analysis, X-ray diffraction, scanning electron microscope, and transmission...
A novel silicate-based protective film was formed on negative electrodes and compared of the performance in various electrolyte systems of lead-acid batteries. The sodium silicate-based coating for the negative electrode component of a gel valve-regulated lead-acid (gel-VRLA) battery was applied for the first time in the literature. The battery system was produced by sodium silicate-coated negative...
In this work, a one-step procedure for preparing graphene pencil graphite electrodes is developed by using cyclic voltammetry (CV). The potential is scanned from − 1.0 to + 1.90 V (vs. Ag/AgCl) in a sulfuric acid solution in this system. The in situ electrochemical oxidation of graphite to graphene oxide (GO) and then the electrochemical reduction of GO to graphene are observed in the cyclic voltammograms...
A high performing and thermally stable magnesium aluminate (MgAl2O4) coated on both sides of Celgard 2320 for applications in lithium batteries was prepared. The MgAl2O4-coated membrane was thermally stable up to 440 °C and capable of up-taking electrolytes up to 250%. The contact angle of MgAl2O4-coated membrane was lower (21°) than that of uncoated membrane. The MgAl2O4-coated ceramic separator...
Fluoroethylene carbonate (FEC) is investigated as the electrolyte additive to improve the electrochemical performance of high voltage LiNi0.6Co0.2Mn0.2O2 cathode material. Compared to LiNi0.6Co0.2Mn0.2O2/Li cells in blank electrolyte, the capacity retention of the cells with 5 wt% FEC in electrolytes after 80 times charge-discharge cycle between 3.0 and 4.5 V significantly improve from 82.0 to 89...
In this work, a graphene-decorated Li2S cathode has been prepared via spray drying method using Li2SO4, graphene oxide and sucrose as raw materials. During spray drying, sucrose melts and embeds Li2SO4 when Li2SO4 were sprayed out with graphene oxide and sucrose, and becomes sphere particles. The as-prepared Li2S composite was received after a heat treatment under nitrogen atmosphere. X-ray diffraction...
Polycrystalline sample of the sodium aluminum molybdate, NaAl(MoO4)2, was prepared by conventional solid-state reaction method. Ultraviolet-visible-near-infrared (UV-Vis-NIR) diffuse reflectance spectroscopy revealed that the optical band gap values of this material at ambient conditions are 3.77 and 3.35 eV for direct and indirect transition, respectively. We also report the electrical properties...
A voltammetric study of norepinephrine (NE) in the presence of paracetamol (PA) was carried out using a poly (rhodamine B)-modified carbon paste electrode (CPE). The poly (rhodamine B) electrode was fabricated by potential cyclic voltammetry using a rhodamine B monomer. The modified electrode exhibited a good affirmative response towards the electrooxidation of NE and PA in physiological pH 7.4 phosphate...
In this work, lotus leaves are carbonized at 900 °C and yield nitrogen self-doped spongy-like porous carbons, based on a considerably cost-effective and simple approach. Through electrochemical analysis, the obtained metal-free catalyst exhibits excellent electrocatalytic performance in oxygen (O2) saturated 0.1 M KOH solution with an onset potential of 0.92 V (vs. reverible hydrogen electrode (RHE))...
Samples LixNi0.5Mn1.5O4 (x = 0.8, 0.9, 1.0, 1.1, and 1.2) are synthesized to study the effects of Li contents. When Li contents are not enough, part of the nickel-manganese oxides cannot transfer to LiNi0.5Mn1.5O4 and remain in the product. When Li contents are too much, small amount of lithium-rich oxide is formed. In voltage window of 3.5~4.95 V, Li1.0Ni0.5Mn1.5O4 has the best rate performance due...
Mg-doped lithium-rich layered oxide Li1.2Mn0.54Ni0.13Co0.13O2 with smooth morphology is synthesized by co-precipitation followed by calcination. The morphologies of bare particles and electrodes have been studied through scanning electron microscopy (SEM), which illustrates that, compared with the Mg-doped particles, the pristine particles are characteristic of angular and corrosion is much more likely...
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