Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

Unstable oxidation state +3 of nickel can be stabilized in the structure of layered double hydroxides, the resulting crystallinity and properties being dependent on the synthesis method. Three different wet chemical methods (co-precipitation at variable pH, co-precipitation followed by hydrothermal...

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Bibliographic Details
Published inCrystals (Basel) Vol. 11; no. 11; p. 1429
Main Authors Nestroinaia, Olga V., Ryltsova, Irina G., Lebedeva, Olga E.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2021
Subjects
Aluminum
Chemical precipitation
Chemical synthesis
co-precipitation
Coprecipitation
Crystallization
Hydrothermal treatment
Hydroxides
Lattice parameters
layered double hydroxides
Magnesium
Metals
Methods
microwave treatment
Morphology
Nickel
nickel(III)
Oxidation
Phase composition
Reagents
Software
Spectrum analysis
Thermal transformations
Transmission electron microscopy
Valence
XRD
Japan
Germany
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Summary:Unstable oxidation state +3 of nickel can be stabilized in the structure of layered double hydroxides, the resulting crystallinity and properties being dependent on the synthesis method. Three different wet chemical methods (co-precipitation at variable pH, co-precipitation followed by hydrothermal treatment, co-precipitation with microwave treatment) were used to synthesize Mg/Ni–Al layered double hydroxides containing triply charged nickel cations. Lattice parameters of the samples synthesized by various methods were found to differ from each other by about 1.5%. The most crystallized sample was obtained by hydrothermal synthesis. The oxidation state of nickel in the LDH samples was confirmed by XPS. TEM mapping gave evidence of the uniform distribution of nickel in all the samples. The LDHs’ reduction with hydrogen and thermal transformations of the phase composition and morphology of LDHs were studied in detail. The properties of the samples synthesized by the different methods were shown to be quite similar.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11111429