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Spinel LiMn2O4 already has a large number of methods for preparation and modification after many years of research. However, there are few reports on the morphology design of spinel LiMn2O4 by microwave synthesis method. Herein, we provide a simple method for synthesizing spinel LiMn2O4 with porous morphology by coprecipitation-microwave sintering method. And the method is expected to be extended...
A core-shell and spherical structured Fe3O4@MnO2 nanostructure is designed and developed via a facile and low-cost two-step method. Core-shell structured Fe3O4@MnO2 with uniform morphology can be obtained after layered structured δ-MnO2 is grown on the surface of Fe3O4 nanospheres. The crystal structures and morphology of as-prepared Fe3O4@MnO2 are characterized by scanning electron microscopy, X-ray...
Highly active and durable catalysts are imperative for the development of alcohol oxidation research. Herein, a Ni/NiO-C catalyst with hollow NiO crystal can be used in ethanol oxidation. The hollow NiO nanoparticles are absolutely coated in the amorphous carbon and the generated NiO crystal remarkably raises the electrocatalytic performances of catalysts. Among all samples, the Ni/NiO-C3 catalyst...
To address the challenge of the IL-based electrolyte cannot be effectively intercalated in graphite anode, and especially the urgent needs for the compatibility between high performance and high security, the IL-based hybrid electrolyte systems with ethylene carbonate/propylene carbonate (EC/PC) as a co-solvent and vinylene carbonate (VC) as an additive were designed. The high dielectric constant...
A thin-film lithium phosphorous oxynitride (LiPON) layer on the top of a graphite anode is synthesized via radio frequency magnetron sputtering, whereas the thickness of the film is about 0.3 ~ 1.3 μm. The field emission scanning electron microscopy on the samples confirms the even-coated layer on the anode, while the thickness of layer is reconfirmed by weighing the area density of sputtered anode...
A facile and versatile low-cost solid-liquid interface-mediated method for the synthesis of mesoporous and amorphous NiCoBP alloys with high surface areas was developed. The precursors of Ni, Co, and P, with a controllable molar ratio, were first dissolved in ultrapure water, frozen, and treated with NaBH4 solution to form NiCoBP alloys at room temperature. Benefiting from its mesoporous and amorphous...
A flexible Co3O4 hollow microsphere/graphene/carbon nanotube hybrid film is successfully prepared through a facile filtration strategy and a subsequent thermally treated process. The composition, morphology, and structure of the as-prepared film are characterized by X-ray diffraction, X-ray photoelectron spectrometer, scanning electron microscopy, and transmission electron microscopy. Based on the...
In this paper, a simple and controllable one-step electrodeposition method was used to fabricate a novel reduced graphene oxide-gold nanoparticles (RGO-GNPs) nanocomposite film onto the surface of bare glass carbon electrode (GCE), and then, Nafion was modified onto the film to prepare an electrochemical sensor for simultaneous detection of trace Cd(II) and Pb(II) in square-wave anodic stripping voltammetry...
A facile and low cost molten salt method for the synthesis of Co@Co(OH)2 core-shell nanostructured material exhibiting high specific capacitances for supercapacitors was developed. In our conditions, the molten salt acted as solvent and reducing agent for the precipitation and formation of Co-based nano-structures. It was observed that in the Co@Co(OH)2 core-shell nanostructure, Co cores can act as...
In the oxygen reduction reaction (ORR), the oxygen transport rate plays an important role in the ORR on the cathode. An approach by applying magnetic fields on the cathode can effectively improve the oxygen transport. However, no work reports the effect of the magnetism of ferromagnetic catalysts on ORR under an external magnetic field. Herein, the catalytic performances of the ferromagnetic catalysts...
Different particle sizes of dodecahedron precursors are synthesized by controlling the polarity of the solution. Through the results of scanning electron microscope (SEM) images, it can be found that different particle sizes of precursors present obvious edge angles and their morphology can be well retained after annealing. X-ray diffraction (XRD) measurements suggest that the annealed polyhedral...
V2O5-SiO2 hybrid material was fabricated by heat-treating a mixture of H2SiO3 and V2O5. SEM, TEM, XRD, and N2 isotherm analyses were performed to characterize the morphology and structure details of the as-prepared V2O5-SiO2. The possibility of using the as-prepared V2O5-SiO2 as anode material for aqueous lithium-ion batteries was investigated. Potentiostatic and galvanostatic results indicated that...
Coal-based active carbon was prepared and used as electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon electrodes with different pore structure was studied, including cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. With an increase of sodium hydrate/coal ratio, the pore structure of active carbon is greatly...
Elastic hollow SnO2 microspheres are synthesized through a facile templating method. The obtained hollow microspheres have a size of 1–3 μm, which are assembled by lots of nanoparticles of ∼20 nm. The electrochemical performance of the spheres as anode materials for lithium–ion batteries is evaluated. Benefited from the intrinsic structure advantages, the hollow tin dioxide exhibits good electrochemical...
ZnO microparticles with radial morphology are synthesized by hydrothermal method using polystyrene spheres as templates. The obtained ZnO microparticles have a size of 5–10 μm, which are assembled by lots of ZnO nanoparticles of ~10 nm. According to the starting materials used and characterization results observed, the formation process for the growth of the radial-like architecture is proposed. Electrochemical...
Iron nanoparticles wrapped in N-doped carbon (INC) were synthesized by a two-step method which includes a hydrothermal and a thermal treatment. The PtSn nanoparticles were then deposited on the resulting carbon material using an ethylene glycol reduction method. Scanning electron microscopy images indicated INC had an interconnected, porous framework with continuous macropores in the micrometer range...
Controlled growth of flower-like SnS2 hierarchical structures was obtained by a facile hydrothermal method with the mixture solution of SnCl4 and L-cysteine (L-cys). The results of electron microscopy and X-ray diffraction characterization indicated that morphology, structure, and crystallinity of the hierarchical structures were seriously dependent on the concentration of L-cys, mole ratio of Sn4+...
Hierarchical Fe5(PO4)4(OH)3·2H2O microflower was synthesized by a hydrothermal reaction with self-prepared β-FeOOH nanorod as raw material. The microflowers were self-assemblies of symmetric building blocks with deep grooves. The possible morphology evolution process was proposed. The microflowers morphology was retained when they were lithiated to prepare LiFePO4/C composites through a carbothermal...
In this paper, a novel Nafion polymer-coated stannum film-modified carbon paste electrode was developed for the analysis of trace cadmium by square wave anodic stripping voltammetry. The electronic conductive material—molecular wire (diphenylacetylene)—was employed as the binder instead of traditional mineral oil for fabricating this electrode. It was found that the prepared electrode possessed excellent...
To improve the electrocatalytic properties of PtRu/C in methanol electrooxidation, nanoparticulate TiO2-promoted PtRu/C catalysts were prepared by directly mixing TiO2 nanoparticles with PtRu/C. Using cyclic voltammetry, it was found that the addition of 10 wt% TiO2 nanoparticles can effectively improve the electrocatalytic activity and stability of the catalyst during methanol electrooxidation. The...
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