Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors

A series of NiO/C nanocomposites with NiO concentrations ranging from 10 to 90 wt% was synthesized using a simple and efficient two-step method based on non-isothermal decomposition of Nickel(II) bis(acetylacetonate). X-ray diffraction (XRD) measurements of these NiO/C nanocomposites demonstrate the presence of β-NiO. NiO/C nanocomposites are composed of spherical particles distributed over the carbon support surface. The average diameter of nickel oxide spheres increases with the NiO content and are estimated as 36, 50 and 205 nm for nanocomposites with 10, 50 and 80 wt% NiO concentrations, respectively. In turn, each NiO sphere contains several nickel oxide nanoparticles, whose average sizes are 7–8 nm. According to the tests performed using a three-electrode cell, specific capacitance (SC) of NiO/C nanocomposites increases from 200 to 400 F/g as the NiO content achieves a maximum of 60 wt% concentration, after which the SC decreases. The study of the NiO/C composite showing the highest SC in three- and two-electrode cells reveals that its SC remains almost unchanged while increasing the current density, and the sample demonstrates excellent cycling stability properties. Finally, NiO/C (60% NiO) composites are shown to be promising materials for charging quartz clocks with a power rating of 1.5 V (30 min).

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Preparation of Submicron Metastable Spherical β-Bi2O3 Particles by Self-Propagating High-Temperature Synthesis Method

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2019.16715 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7436-7441

Author(s):

Chu Zhang ◽

Qi-Yu Wang ◽

Ming-De Li ◽

Guo-Dong Zhang

Keyword(s):

High Temperature ◽

High Efficiency ◽

Synthesis Method ◽

Reaction System ◽

Average Diameter ◽

Spherical Particles ◽

Molar Ratio ◽

Temperature Synthesis ◽

High Temperature Synthesis ◽

One Step

Sub-micrometer particles of β-Bi2O3 were successfully synthesized via a one-step self-propagating high-temperature synthesis (SHS) method for the first time. The experiments were carried out in the air at room temperature. The products were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). In this study, three experiments were designed to optimize the heat source, Bi source and additive for the reaction system. Results showed that the system composed of Al, Bi2O3 and Al2O3 powders could synthesize monodisperse high-purity β-Bi2O3 spherical particles with the average diameter of 369 nm and the as-prepared products kept stable after being exposed in air for one month. Then, the influences of the ratio of the three components on system were investigated. Interestingly, it was found that a slight adjustment on the ratio of Al:Bi2O3:Al2O3 had significant effects on the reactions happening in a system. Specifically, when the amount of Al2O3 exceeds the molar ratio of 2:1:1 (Al:Bi2O3:Al2O3), it is difficult to ignite the reaction system; when the amount is less than 2:1:0.5, the reaction system becomes too violent to obtain pure products. However, there are no obvious differences on the morphology and structure of final products with the two ratios because of few changes in adiabatic temperature. Preparation of β-Bi2O3 by SHS technique enjoying many advantages, such as high efficiency, inexpensive experimental equipment and simple processes, would has a promising prospect for industrial application.

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Thermal Conductivity of Nickel Oxide Nanoparticles Synthesized by Combustion Method

MRS Proceedings ◽

10.1557/proc-1256-n06-21 ◽

2010 ◽

Vol 1256 ◽

Author(s):

Pranati Sahoo ◽

Dinesh Misra ◽

Girija Shankar Chaubey ◽

James Salvador ◽

Nathan J. Takas ◽

...

Keyword(s):

Thermal Conductivity ◽

Nickel Oxide ◽

Surface Area ◽

Reaction Temperature ◽

Synthesis Method ◽

Solution Combustion Synthesis ◽

Bet Surface Area ◽

Oxide Nanoparticles ◽

Solution Combustion ◽

Nickel Oxide Nanoparticles

AbstractMonodispersed nickel oxide nanoparticles have been synthesized using solution combustion synthesis method. Size of the nanoparticles was controlled by varying different reaction parameters such as reaction temperature and reaction time. Structure and morphology of the nanoparticles were investigated using X-ray diffraction and transmission electron microscopy. BET surface area of 99.7 m2/g was obtained for the nanoparticles synthesized at 300 °C. A decrease in surface area was observed with increase in reaction temperature. The nanoparticles were compacted using spark plasma sintering technique at 950 °C and thermal conductivity was studied on compacted sample. Significant decrease in thermal conductivity was observed for nanoparticles in compared to their bulk counter-part.

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In Situ Flame Synthesis of Polyhedral Nickel Oxide Nanoparticles on Carbon Fibers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.557-559.438 ◽

2012 ◽

Vol 557-559 ◽

pp. 438-441

Author(s):

Xu Sheng Du ◽

Hong Yuan Liu ◽

Yiu Wing Mai ◽

Ying Gang Miao

Keyword(s):

Nickel Oxide ◽

Carbon Fibers ◽

Synthesis Method ◽

Concentration Effect ◽

Flame Synthesis ◽

Oxide Nanoparticles ◽

High Magnification ◽

Nickel Oxide Nanoparticles ◽

Sem And Tem

Mono-dispersed Nickel oxide nanoparticles were directly formed on the carbon fibers through a facile in situ flame synthesis method. High magnification SEM and TEM study revealed that the nickel oxide nanoparticles have a polyhedral structure and are uniformly distributed on the surface of carbon fibers. The concentration effect of the precursor used on the growth of polyhedral nickel oxide nanoparticles on carbon fibers has been studied.

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Structural, Conductivity, and Dielectric Properties of Nickel Oxide and Copper (Cu) or Chromium (Cr) Doped Nickel Oxide Nanoparticles

10.21203/rs.3.rs-415150/v1 ◽

2021 ◽

Author(s):

Ali Bashal ◽

Tarob A Abdel Baset ◽

Mostafa Abboudi ◽

Hamza Qasem ◽

Fahd Al-Wadaani

Keyword(s):

Electron Microscopy ◽

Dielectric Properties ◽

Nickel Oxide ◽

Spherical Particles ◽

Relative Pressure ◽

X Ray Diffraction ◽

Nickel Oxide Nanoparticles ◽

X Ray ◽

Nio Nps ◽

Adsorption Desorption

Abstract In this study, NiO NPs and doped NiO NPs were prepared in a two-step process and they were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption desorption. X-ray diffraction outcome clarified that all the patterns present the similar peaks that are attributed to the cubic variety of the NiO and all doping metals could be inserted into the NiO structure. TEM result showed that the NiO NPs are assembled side by side and aligned along the same direction to form small array shaped nano-agglomerates of 500 nm in length and 50–70 nm in diameter. Adsorption-desorption isotherms for N2 showed that NiO NPs represents type IV isotherms containing a hysteresis loop at relative pressure between 0.5 and 1.0. Hysteresis loop’s shape was of H2 type which is characteristic of inckbottle shaped pores. It was also in the shape of solids composed by small spherical particles. The dielectric properties and electrical conductivity for these samples were also studied within the temperature range 25oC – 110oC and within the frequency range 100 Hz to 0.3 MHz.

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Exploring the characteristics of the nickel oxide nanoparticles via Sol - gel method

Nanoscale Reports ◽

10.26524/nr.3.24 ◽

2020 ◽

Vol 3 (3) ◽

Author(s):

Jothi M ◽

Sowmiya K

Keyword(s):

Nickel Oxide ◽

Ph Value ◽

Lattice Structure ◽

Sol Gel ◽

Systematic Change ◽

Average Crystalline Size ◽

Nio Nanoparticles ◽

Nickel Oxide Nanoparticles ◽

X Ray ◽

Vis Spectroscopy

Nickel Oxide (NiO) is an important transition metal oxide with cubic lattice structure. NiO is thermally stable that is suitable for tremendous applications in the field of optic, ceramic,glass, electro-chromic coatings, plastics, textiles, nanowires, nanofibers, electronics,energy technology, bio-medicine, magnetism and so on. In this present study, NiO nanoparticles were successfully synthesized by sol-gel technique. Nano-sols were prepared by dissolving Nickel-Chloride [NiCl2.6H2O] in NaOH solvent and were converted into nano structured gel on precipitation. A systematic change in preparation parameters like calcination temperature, time, pH value has been noticed in order to predict the influence on crystallite size. Then the prepared samples were characterized by the X-ray Diffraction Spectroscopic (XRD), UV-VIS Spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). From XRD, the average crystalline-size has been calculated by Debye-Scherrer Equation and it was found to be 12.17 nm and the band gap energy of Nickel oxide (NiO) from UV studies reveals around 3.85 eV. Further, EDX and FTIR studies, confirm the presences of NiO nanoparticles. The SEM study exhibits the spherical like morphology of Nickel oxide (NiO). Further from PSA, the mean value of NiO nanoparticles has been determined.

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EXPERIMENTAL ASSESSMENT OF THE NANOPARTICLES TOXICITY OF NICKEL OXIDE IN TWO SIZES IN THE SUBCHRONIC EXPERIMENT

ЗДОРОВЬЕ НАСЕЛЕНИЯ И СРЕДА ОБИТАНИЯ - ЗНиСО / PUBLIC HEALTH AND LIFE ENVIRONMENT ◽

10.35627/2219-5238/2018-309-12-30-35 ◽

2018 ◽

pp. 30-35

Author(s):

M.P. Sutunkova ◽

B.A. Katsnelson ◽

L.I. Privalova ◽

S.N. Solovjeva ◽

V.B. Gurvich ◽

...

Keyword(s):

Nickel Oxide ◽

Nervous Activity ◽

Equal Mass ◽

The Body ◽

Subchronic Toxicity ◽

Physiological Mechanisms ◽

Nickel Oxide Nanoparticles ◽

The Relationship ◽

The Brain ◽

Nanoparticles Toxicity

We conducted a comparative assessment of the nickel oxide nanoparticles toxicity (NiO) of two sizes (11 and 25 nm) according to a number of indicators of the body state after repeated intraperitoneal injections of these particles suspensions. At equal mass doses, NiO nanoparticles have been found to cause various manifestations of systemic subchronic toxicity with a particularly pronounced effect on liver, kidney function, the body’s antioxidant system, lipid metabolism, white and red blood, redox metabolism, spleen damage, and some disorders of nervous activity allegedly related to the possibility of nickel penetration into the brain from the blood. The relationship between the diameter and toxicity of particles is ambiguous, which may be due to differences in toxicokinetics, which is controlled by both physiological mechanisms and direct penetration of nanoparticles through biological barriers and, finally, unequal solubility.

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TOXIC EFFECTS ASSESSMENT OF NICKEL OXIDE NANOPARTICLES BY INHALATION

ЗДОРОВЬЕ НАСЕЛЕНИЯ И СРЕДА ОБИТАНИЯ - ЗНиСО / PUBLIC HEALTH AND LIFE ENVIRONMENT ◽

10.35627/2219-5238/2018-309-12-24-30 ◽

2018 ◽

pp. 24-29 ◽

Cited By ~ 2

Author(s):

B.A. Katsnelson ◽

M.P. Sutunkova ◽

L.I. Privalova ◽

S.N. Solovjeva ◽

V.B. Gurvich ◽

...

Keyword(s):

Nickel Oxide ◽

Redox Balance ◽

Systemic Toxicity ◽

Laboratory Animals ◽

Oxide Nanoparticles ◽

Nickel Oxide Nanoparticles ◽

White Rats ◽

Liver And Kidney ◽

Stimulation Of Erythropoiesis ◽

Nio Nps

The article presents in an experiment obtained principal results based on repeated low-level inhalation exposures of laboratory animals (white rats, outbred) to nickel oxide nanoparticles with a diameter of (23 ± 5) nm, 4 hours a day, 5 times a week for up to 10 months in a «nose only» installation. It was shown that non-specific body reactions to the action of NiO NPs include: diverse manifestations of systemic toxicity with a particularly pronounced influence on liver and kidney function, redox balance, damage to some areas of brain tissue, associated with proven movement of the nanoparticles themselves from the nasal mucosa along the olfactory tract; some cytological signs of probable development for allergic syndrome; paradoxically low severity of pulmonary pathology by pneumoconiotic type explained by a small chronic delay of nanoparticles in the lungs; the genotoxic effect of the organismal level, even at those low levels of chronic exposure, at which systemic toxicity is rather poorly. Along with that, NiO NPs also induce phase-stimulation of erythropoiesis, which is relatively specific for the toxic nickel effects.

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