Low-Temperature Liquid-Phase Synthesis and Electrochemical Activity of α-Nickel Hydroxide with Flower-Like Micro-/Nano-Structure

The synthesis of α-nickel hydroxide has been achieved via a facile liquid-phase precipitation approach, using the mixed solvents of ethylene glycol and water as reaction medium at low temperature. The XRD characterization indicates that pure phase α-Ni(OH)2can be obtained under variable temperature and pH value. The products present a flower-like micro-/nano-structure assembled with curved nanosheets. The nanosheets have the width of 100~500 nm and the thickness of 20~70 nm. The cavities are formed in the structure due to the interconnection of curved nanosheets. The solvents play a key role in the formation of Ni(OH)2with different forms. Pure phase α-Ni(OH)2can only be synthesized in the mixed solvents of ethylene glycol and water. Cyclic voltammetry was applied to test the electrochemical activity of the as-synthesized α-Ni(OH)2. The findings suggest that the α-Ni(OH)2with a micro-/nano-structure exhibits excellent electrochemical activity, which may be considered as a promising candidate of electrode material.

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Ethylene glycol-mediated one-pot synthesis of Fe incorporated α-Ni(OH)2 nanosheets with enhanced intrinsic electrocatalytic activity and long-term stability for alkaline water oxidation

Dalton Transactions ◽

10.1039/d1dt00226k ◽

2021 ◽

Author(s):

Venkataramanan Mahalingam ◽

Gouri Tudu ◽

Sourav Ghosh ◽

Sagar Ganguli ◽

Murthy Koppsetti ◽

...

Keyword(s):

Ethylene Glycol ◽

Water Splitting ◽

Nickel Hydroxide ◽

Oxygen Evolution Reaction ◽

Water Oxidation ◽

Electrocatalytic Activity ◽

One Pot ◽

Long Term Stability ◽

Pure Phase

Sustainable electrocatalytic water splitting stipulates development of cheap, efficient and stable electrocatalysts to promote comparatively sluggish oxygen evolution reaction. We have synthesized iron incorporated pure phase α-nickel hydroxide, Ni0.8Fe0.2(OH)2 electrocatalyst...

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The Synthesis and Characterizations of Narrow-Dispersed Copper Nanoparticles

ASME 2009 7th International Conference on Nanochannels, Microchannels and Minichannels ◽

10.1115/icnmm2009-82033 ◽

2009 ◽

Author(s):

Wei Yu ◽

Huaqing Xie ◽

Lifei Chen ◽

Yang Li ◽

Chen Zhang

Keyword(s):

Ethylene Glycol ◽

Copper Nanoparticles ◽

Pure Copper ◽

Synthesis Method ◽

Reaction Medium ◽

Polyvinyl Pyrrolidone ◽

Copper Particles ◽

Reduction Property ◽

Pure Phase ◽

The Mean

A controlled synthesis method for preparing narrow-dispersed copper nanoparticles, using water and ethylene glycol as the reaction mediums respectively, has been reported. In order to obtain pure-phase copper nanoparticles using water, the reaction time of 8h is essential. Owing to the reduction property of ethylene glycol, the reaction rate using ethylene glycol is higher. In addition, the amount of reduction agent can reduce largely. Polyvinyl pyrrolidone plays great role on the size of copper particles, and the increasing of polyvinyl pyrrolidone concentration attributes to the smaller dimension particles. The mean diameter is about 4 nm when the concentration of polyvinyl pyrrolidone is 0.5 mmol/L. Polyvinyl pyrrolidone acts as the polymeric capping agents in the reaction, preventing the agglomeration of the copper nanoparticles. When water is the reaction medium, Cu2+ complex is reduced to Cu+ complex firstly, and the further reduction of Cu+ forms the pure copper nanoparticle.

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Preparation of Li3PS4–Li3PO4 Solid Electrolytes by Liquid-Phase Shaking for All-Solid-State Batteries

Electronic Materials ◽

10.3390/electronicmat2010004 ◽

2021 ◽

Vol 2 (1) ◽

pp. 39-48

Author(s):

Nguyen H. H. Phuc ◽

Takaki Maeda ◽

Tokoharu Yamamoto ◽

Hiroyuki Muto ◽

Atsunori Matsuda

Keyword(s):

Solid Solution ◽

Solid State ◽

Liquid Phase ◽

Room Temperature ◽

Reaction Medium ◽

Magic Angle Spinning ◽

Resonance Spectroscopy ◽

Synthesis Methods ◽

Magic Angle ◽

Angle Spinning

A solid solution of a 100Li3PS4·xLi3PO4 solid electrolyte was easily prepared by liquid-phase synthesis. Instead of the conventional solid-state synthesis methods, ethyl propionate was used as the reaction medium. The initial stage of the reaction among Li2S, P2S5 and Li3PO4 was proved by ultraviolet-visible spectroscopy. The powder X-ray diffraction (XRD) results showed that the solid solution was formed up to x = 6. At x = 20, XRD peaks of Li3PO4 were detected in the prepared sample after heat treatment at 170 °C. However, the samples obtained at room temperature showed no evidence of Li3PO4 remaining for x = 20. Solid phosphorus-31 magic angle spinning nuclear magnetic resonance spectroscopy results proved the formation of a POS33− unit in the sample with x = 6. Improvements of ionic conductivity at room temperature and activation energy were obtained with the formation of the solid solution. The sample with x = 6 exhibited a better stability against Li metal than that with x = 0. The all-solid-state half-cell employing the sample with x = 6 at the positive electrode exhibited a better charge–discharge capacity than that employing the sample with x = 0.

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