phase and composition controllable synthesis of cobalt
Phase-controllable synthesis of cobalt hydroxide for
Herein we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER α-Co(OH)2 with both Co2 Td and Co2 Oh sites and β-Co(OH)2 with Co2 Oh sites. Electrochemical characterization reveals that α-Co(OH)2 is more active than β-Co(OH)2 towards OER.
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Phase and composition controllable synthesis of cobalt
Jun 04 2015 · Phase and composition controllable synthesis of cobalt manganese spinel nanoparticles towards efficient oxygen electrocatalysis Abstract. Spinel-type oxides are technologically important in many fields including electronics magnetism catalysis Introduction. Spinel-type compounds with the
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Composition and Oxidation State of Cobalt and Nickel-Iron
The magnetic nanoparticles of cobalt-and nickel-iron oxide have been extensive interest due to their superparamagnetic properties and their potential applications in many fields. The iron cobalt and nickel can stay in many oxidation states and are easily oxidized especially in ambient air therefore the composition and oxidation states of these oxides can be unintentionally modified.
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(PDF) Shape controlled synthesis of iron–cobalt alloy
Materials Letters 64 (2010) 1127–1129 Contents lists available at ScienceDirect Materials Letters j o u r n a l h o m e p a g e w w w. e l s ev i e r. c o m / l o c a t e / m a t l e t Shape controlled synthesis of iron–cobalt alloy magnetic nanoparticles using soft template method Santosh K. Pal D. Bahadur ⁎ Department of Metallurgical Engineering and Materials Science Indian
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SYNTHESIS AND CHARACTERIZATION OF COBALT
2.4 Liquid-Phase Synthesis of Cobalt and Other Magnetic Nanoparticles 24 2.4.1 Metal Salt Reduction 26 2.4.2 Reactions in Reverse Micelles 29 2.4.3 Organometallic Syntheses 30 2.4.3.1 High Temperature Reduction 31 2.4.3.2 Thermal Decomposition of Organometallic Compounds 32 2.5 Tailoring the Particle Size of Cobalt and Other Nanoparticles 32
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Phase- and morphology-controlled synthesis of cobalt
Dec 01 2015 · Phase- and morphology-controlled synthesis of cobalt sulfide NCs In a typical synthesis cobalt acetylacetonate (Co (acac) 2 Aldrich 95 ) 0.386 g 1-dodecanethiol (Aldrich 90 ) 2 mL and oleic acid (OA Aldrich 85 ) 7 mL were put into a four-necked flask
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SYNTHESIS AND CHARECTERIZATION OF BARIUM
phase distribution and the lack of control to the microstructure of the composites. To overcome these difficulties S.Q .Ren reports a novel approach 3 of preparing multiferroic BaTiO 3 /CoFe 2 O 4 composites through a one-pot process. The BaTiO 3 /CoFe 2 O 4 particulate composites are synthesized by a one-pot process.
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SYNTHESIS AND CHARACTERIZATION OF COBALT
2.4 Liquid-Phase Synthesis of Cobalt and Other Magnetic Nanoparticles 24 2.4.1 Metal Salt Reduction 26 2.4.2 Reactions in Reverse Micelles 29 2.4.3 Organometallic Syntheses 30 2.4.3.1 High Temperature Reduction 31 2.4.3.2 Thermal Decomposition of Organometallic Compounds 32 2.5 Tailoring the Particle Size of Cobalt and Other Nanoparticles 32
Chat OnlineOptimizing Processing Conditions to Produce Cobalt Ferrite
Jun 01 2016 · The excellent chemical stability good mechanical hardness and a large positive first order magnetocrystalline anisotropy constant of cobalt ferrite (CoFe2O4) make it a promising candidate for magneto‐optical recording media. For practical applications the capability to control particle size at the nanoscale is required in addition to precise control of the composition and structure of
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Phase and composition controlled synthesis of cobalt
Developing cheap highly efficient and stable electrocatalysts for both oxygen and hydrogen evolution reactions (OER and HER) is extremely meaningful to realize large-scale implementation of water splitting technology. Herein we report the phase and composition controlled synthesis of cobalt
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Characterization of Cobalt Sulfide Thin Films Synthesized
Abstract. Cobalt sulfide thin films were synthesized from acidic chemical baths by varying the deposition time. The powder X-ray diffraction studies indicated that there are hexagonal CoS face-centered cubic Co 3 S 4 and cubic Co 9 S 8 phases of cobalt sulfide. The crystallite size of the hexagonal CoS phase decreased from 52.8 nm to 22.5 nm and that of the cubic Co 9 S 8 phase
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Composition and Oxidation State of Cobalt and Nickel-Iron
The magnetic nanoparticles of cobalt-and nickel-iron oxide have been extensive interest due to their superparamagnetic properties and their potential applications in many fields. The iron cobalt and nickel can stay in many oxidation states and are easily oxidized especially in ambient air therefore the composition and oxidation states of these oxides can be unintentionally modified.
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Rapid and Controllable Synthesis of Nanocrystallized
Aug 28 2020 · Rapid and Controllable Synthesis of Nanocrystallized Nickel‐Cobalt Boride Electrode Materials via a Mircoimpinging Stream Reaction for High Performance Supercapacitors Qingcheng Zhang College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 China
Chat OnlineControlled vapor-phase synthesis of cobalt oxide
Mar 08 2010 · Read "Controlled vapor-phase synthesis of cobalt oxide nanomaterials with tuned composition and spatial organization CrystEngComm" on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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Abstract Cobalt-Copper Alloy Nanoparticle Catalysts for
A consistent alloy phase and composition was observed prior to reaction suggesting the synthesis successfully reduced the metal precursors to the cobalt-copper alloy phase. After reaction new phases were observed to have formed via metal segregation and cobalt carbide formation.
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Synthesis and Characterization of Cobalt Nanoparticles
Cobalt is one of the most important ferromagnetic metals due to its three metastable phases with different crystallographic structures namely the hexagonal closed packed (hcp) phase the face-centered cubic (fcc) phase and the epsilon phase 4 5
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General and Controllable Synthesis Strategy of Metal Oxide
Oct 03 2012 · Xu R. Zeng H. C. Dimensional Control of Cobalt-hydroxide-carbonate Nanorods and Their Thermal Conversion to One-Dimensional Arrays of Co3O4 Nanoparticles. J. Phys. Chem. B
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Synthesis and Characterization of Monodisperse Cobalt
Solution phase chemical synthesis is generally not thermodynamically controlled which makes it possible to prepare metastable crystal phases 5 . In this article we describe the reduction of cobalt chloride with lithium triethyl boronhydride (superhydride) to produce cobalt
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Phase-Controlled Synthesis of Metastable Nanocrystalline
the possibility to control the kinetics of the metal forming reaction which in turn would lead to the formation of metastable phases. On this basis we investigated the options to achieve a phase-controlled synthesis of nanocrystalline cobalt using a modified polyol process and different types of polyols to stabilize metastable phases
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Phase-controlled synthesis of cobalt sulfides for lithium
Phase-controlled synthesis of cobalt sulfides for lithium ion batteries. Wang Y(1) Wu J Tang Y Lü X Yang C Qin M Huang F Li X Zhang X. Author information (1)CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese
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Controlled vapor-phase synthesis of cobalt oxide
Controlled vapor-phase synthesis of cobalt oxide nanomaterials with tuned composition and spatial organization Davide Barreca a Alberto Gasparotto b Oleg I. Lebedev cd Chiara Maccato b Andrea Pozza b Eugenio Tondello b Stuart Turnerc and Gustaaf Van Tendelooc Received 14th December 2009 Accepted 2nd February 2010
Chat OnlineSynthesis of nanosized spherical cobalt powder by
particles of complex composition and controlled phase content suitable for direct application or fabrication of high technologysinteredmaterials can be prepared by the spraypyrolysis method 5 . Theultrasonic spray pyrolysis(USP) is a versatile technique for producing various materials in a wide range of composition size and morphology. Suh and
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Phase and composition controllable synthesis of cobalt
The above results indicate controllable synthesis of cubic/ tetragonal spinel phase in an unprecedented wide composition of (Co3 _xMnxO4 1
Size- and phase-controlled synthesis of cobalt
The present work addresses the synthesis and characterization of crystalline cobalt nanoparticles produced through a modified polyol-process conducive to the controlled formation of magnetic soft-Co structures with potential for applications in biomedicine. XRD characterization evidenced the influence of oleate and acetate species on the formation and crystal growth-inhibition of crystalline
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(PDF) Synthesis and characterization of cobalt oxide
The chemical composition confirmed the purity and stoichiometry of the neat complex. Synthesis of Co 3 O 4 nanoparticlesBlack Co 3 O 4 nanocrystals were produced by subjecting 0.01 mol of the as-prepared Co(salophen) powders to heat treatment at a relatively low temperature (773 K) in air.
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Phase and Composition Controllable Synthesis of Cobalt
Phase and Composition Controllable Synthesis of Cobalt Manganese Spinel Nanoparticles towards Efficient Oxygen Electrocatalysis.pdf Available via license CC BY 4.0 Content may be subject to
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Controlled vapor-phase synthesis of cobalt oxide
Mar 08 2010 · Read "Controlled vapor-phase synthesis of cobalt oxide nanomaterials with tuned composition and spatial organization CrystEngComm" on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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Morphology-Controllable Synthesis of Cobalt Oxalates and
In this work one-dimensional and layered parallel folding of cobalt oxalate nanostructures have been selectively prepared by a one-step template-free water-controlled precipitation approach by simply altering the solvents used at ambient temperature and pressure. Encouragingly the feeding order of solutions played an extraordinary role in the synthesis of nanorods and nanowires. After
Chat OnlineSynthesis of nanosized spherical cobalt powder by
particles of complex composition and controlled phase content suitable for direct application or fabrication of high technologysinteredmaterials can be prepared by the spraypyrolysis method 5 . Theultrasonic spray pyrolysis(USP) is a versatile technique for producing various materials in a wide range of composition size and morphology. Suh and
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Phase- and morphology-controlled synthesis of cobalt
Abstract. Colalt sulfide nanocrystals (NCs) including dandelion-like Co 9 S 8 and sphere-like Co 3 S 4 have been synthesized via a thermal decomposition approach using cobalt acetylacetonate as the cobalt source 1-dodecanethiol as the sulfur source and oleic acid or oleylamine as the high boiling organic solvent.It is found that the molar ratio of the Co S precursor and the species of
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