Synthesis of Highly Dispersed 2D Aluminum Cobalt Oxyhydroxide Compounds Based on Microwave-Activation Products of Crystalline Gibbsite

A. V. Zhuzhgov, O. P. Krivoruchko, T. V. Larina, A. V. Ishchenko, L. A. Isupova

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract—: We have studied interaction between the microwave activation product of gibbsite and an aqueous cobalt nitrate solution at room temperature, atmospheric pressure, and pH 8.0 ± 0.3. The results demonstrate that, under such conditions, the reaction in the near-surface region of the microwave-activated gibbsite particles leads to the formation of an aluminum cobalt oxyhydroxide with fragments of spinel structure and the composition Со2.3Al0.7O4, and a Со6 –xAl2 –x(OH)1.5 · 3.5H2O (0 ≤ x ≤ 1) nonstoichiometric hydrotalcite. The morphology of such compounds is determined by 2D nanoparticles in the form of bent sheets 2–5 nm in thickness and 500 nm or more in length. After calcination at 500°C, the composition of the reaction products corresponds to the aluminum cobalt oxide Со2.3Al0.7O4 with the spinel structure.

Original languageEnglish
Pages (from-to)380-389
Number of pages10
JournalInorganic Materials
Volume55
Issue number4
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • bent highly dispersed 2D aluminum cobalt compounds
  • crystalline gibbsite
  • microwave-activated gibbsite
  • SPINELS
  • HYDROXIDES
  • CO

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