Journal
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
Volume 66, Issue 10, Pages 1463-1468Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S003602362110003X
Keywords
nanopowders; nickel; electron microscopy; hydrothermal synthesis
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Funding
- state assignment for the Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia [0287-2021-0014]
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The research studied the reduction of divalent nickel with hydrazine hydrate from alkaline ammonia solutions at elevated temperatures and proposed a method to synthesize finely divided nickel powders. It was found that needle-like and spherical particles can form under different synthesis conditions, with the specific surface area of the metallic nickel powders ranging from 5-20 m(2)/g depending on the synthesis conditions. X-ray analysis showed that the powders are mixtures of nickel and nickel hydroxide, with X-ray photoelectron spectroscopy revealing that the particles consist of a nickel(0) core coated with nickel hydroxide layers.
The reduction of divalent nickel with hydrazine hydrate from alkaline ammonia solutions at elevated temperatures was studied. A procedure to synthesize finely divided nickel powders was proposed. The morphology of the objects obtained under various synthesis conditions was investigated by scanning electron microscopy; it was shown that both needle-like and spherical particles can form. The specific surface area of the synthesized metallic nickel powders was determined by low-temperature nitrogen adsorption to be within the range 5-20 m(2)/g, depending on the synthesis conditions (the concentration of the initial salt in the solution, the pH, and the temperature). X-ray powder diffraction analysis showed that all the powders are mixtures of two phases: nickel (to 99%) and nickel hydroxide. X-ray photoelectron spectroscopy demonstrated that a particle of the powders consists of a nickel(0) core coated with several atomic layers of nickel hydroxide.
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