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Solution combustion method was used to synthesize ZnCo2O4 nanoparticles. Then, physical blending method was used to prepare ZnCo2O4/polyaniline (PANI) composite. The crystallite sizes of the ZnCo2O4 and ZnCo2O4/PANI composites prepared were 17.16 nm and 25.46 nm, respectively, as calculated by XRD studies. The density of nanoparticles, cell parameters, and unit cell volume were calculated by Rietveld...
LiAlCl4·3SO2 is a promising electrolyte used for Li metal batteries. At room and low temperature, a stable solid electrolyte interface film can be formed in LiAlCl4·3SO2 to achieve favorable protection for Li metal anodes. Here, Li|Cu cells with SO2-based inorganic electrolyte (LiAlCl4·3SO2) display higher average coulombic efficiency and more excellent cycling stability compared with a conventional...
Boron-nitrogen co-doped graphene nanoarchitectures were synthesized by annealing a freeze-dried precursor containing exfoliated graphene oxide (GO) nanosheets, ammonium borate, and polyvinyl alcohol (PVA). The microstructures and composition of nanocomposites were optimized and characterized systemically. Effects of a doping element on the electrochemical performances and interface compatibility were...
As a potential anode material for Li-ion batteries, ZnO has been intensively studied owing to its high theoretical capacity and low cost. However, low electronic conductivity restricted the application of ZnO in Li-ion batteries. It has been well recognized that morphology-controlled ZnO nanostructures can serve as high-performance anode materials. Here carbon-decorated flower-like ZnO nanostructures...
The electrochemical polymerization of 4,4′-thiobis-phenol in different concentrations of alkaline media has been carried out using cyclic voltammetry. Electrochemical autocatalytic reaction of poly(4,4′-thiobis-phenol) (TDP) in a high concentration of alkaline medium was verified by potentiostatic and galvanostatic electrolysis. PolyTDP showed different electrochemical activities in solutions with...
Metal lithium anodes are quite promising for next-generation batteries due to their high energy density and low voltage, which has attracted numerous attention of the researchers. However, the main challenge for lithium anodes still lies on their serious dendrite problems, leading to the poor cycling stabilities. Here, we introduced poly(vinylidene-co-hexafluoropropylene) (PVDF-HFP) composite film...
The authors regret to have uploaded the wrong Fig. 8 of this manuscript during the submission of the revised manuscript. The correct Fig. 8 is included here.
Herein, we utilize freestanding sheets of multi-walled carbon nanotube (MWCNT), fabricated through a surface-engineered and controlled approach, to provide direct measurements of activities of MWCNT toward the hydrogen evolution reaction (HER). Since conventional fabrication methods of MWCNT materials can result in different carbonaceous residue contents (as reported in literature), the effect of...
Transition metal carbonates are high specific capacity and high initial coulombic efficiency anode materials of the lithium-ion batteries (LiBs). Herein, molecular dynamics simulation found the amorphous instead of the crystallized CoCO3 is more favorable for Li-ion storage. Guided by the dynamics simulations results, the amorphous CoCO3 was synthesized by a facile one-step precipitation method and...
The energy density of a supercapacitor is largely reliant on functional parameters of electrode material and electrolyte. To improve the energy density of the CuS asymmetric device, optimization of sulfur concentration (thiourea) in the precursor and identification of the most suited electrolyte have been attempted. The changes in thiourea concentration greatly affect the physical and electrochemical...
Layered compounds with large interlayer spacing enabling ions intercalation are promising anode materials for sodium-ion and potassium-ion batteries. Herein, we prepared the high-purity layer-structured NbSe2 sheets with compatible interlayer spacing (6.30 Å) via a facile solid-state vacuum sintering. The as-prepared NbSe2 was explored as anode materials for sodium and potassium batteries for the...
The spark plasma sintering and conventional sintering methods were used to prepare the Sr/Mg–codoped Na0.5Bi0.48Sr0.02Ti0.96Mg0.04O2.95 (NBT-SM) compounds. By the AC impedance spectrum test, the grain and total conductivity of NBT-SM sample sintered by the spark plasma sintering method (NBT-SM-SPS) at 673 K can reach 1.23 mS/cm and 0.478 mS/cm, respectively. The grain conductivity of NBT-SM-SPS sample...
Lithium-sulfur (Li-S) battery attracts significant attention as the next-generation battery candidate due to its considerable theoretical energy density. However, the shuttle effect of polysulfides and relatively slow reaction kinetics of sulfur cathode severely hinder the commercial applications of the Li-S battery. Herein, we report NiCo2S4 yolk-shell hollow spheres used as an ideal sulfur host...
The porous carbon materials derived from biomass have become the most promising candidates for electrochemical energy conversion and storage due to their renewability and sustain ability. Herein, we present a simple activation and carbonization approach to successfully fabricate a novel tamarisk root-based honeycomb-like porous carbon (TRHPC) by using biomass tamarisk roots as carbon precursor and...
This paper briefly describes the preparation of LiNi0.5Mn1.5O4 by ultrasonic chemistry and its doping modification. The physical and electrochemical properties of LiNi0.5Mn1.5O4 were studied by SEM and electrochemical tests. The results show that the particles doped with graphene had smaller particle size and uniform distribution. The initial discharge specific capacity of 0.1C was 187 mAh g−1. The...
In this paper, carbon-coated LiFePO4 nano-hollow spheres (LFP@C HSs) were successfully synthesized using lithium phosphate (Li3PO4) nano-spheres as templates and precursors. The X-ray diffractometer (XRD) demonstrated the crystal structure of LFP@C HSs. The morphology of LFP@C HSs was determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with LiFePO4...
A low-cost sulfonated poly(ether ether ketone) (SPEEK) membrane with optimized degree of sulfonation (DS) has been successfully synthesized and applied in iron-chromium redox flow battery (ICRFB) in comparison with Nafion membrane. The SPEEK membrane with an optimum DS of 55% exhibits the cell performance of CE 98.53% and EE 79.13% at 80 mA cm−2 due to its longer charge retention and lower metallic...
Glycine-assisted polyaniline-NiCo2O4 composite porous powder was synthesized by a simple chemical method. The FT-IR and UV-visible spectroscopy analysis confirmed the presence of the corresponding functional groups. Scanning electron microscopy revealed the porous morphology of NiCo2O4 and a brush-like morphology of PANi-NiCo2O4 composite which helps in enhancing the electrochemical performance of...
A family of mixed LiNixCo(1-x)VO4 (x = 0.2, 0.8) cathode materials has been synthesized using the sol–gel method. The thermal behavior of the materials has been examined by thermogravimetric (TG) analysis. The Rietveld refinement of powder X-ray diffraction showed the structure with Fd 3 ¯ m $$ Fd\overline{3}m $$ (227) space group. Surface analysis was performed using field emission scanning...
The dual-emission carbon dots (CDs) are used to fabricate an ultra-sensitive and highly selective fluorescence resonance energy transfer (FRET) aptameric-sensor for the quantitation of Hg(II). The designed strategy worked based on hybridization between T-rich ssDNA(S1) immobilized on CDs and AuNPs modified with complementary aptamer (AuNPs-S2) and Rhodamine B (RB) as an extra internal reference. Under...
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