Preparation of superconducting Nax(H2O) yCoO2 using NaMnO4 as the deintercalation and oxidation agent

Chia Jyi Liu, Wen Chin Hung, Jung Sheng Wang, Chia Jung Charlie Liu

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Abstract

We have used aqueous NaMnO4 solution as the deintercalation and oxidation agent to treat γ-Na0.7CoO2 powders and to successfully obtain superconducting sodium cobalt oxyhydrates, Nax(H2O)yCoO2, with onset Tc ≈ 4.6 K without using highly toxic Br2/CH3CN solution. Chemical analyses indicate that the sodium content x decreases with increasing concentration of NaMnO4 solution and depends slightly on the immersion time. Unlike using a high concentration of aqueous KMnO4 as the deintercalation and oxidation agent, all the hydrated products are the c ≈ 19.6 Å phase with bilayers of water molecules intercalated between the CoO2 layers and sodium layers because of the absence of K+ in the Na+ layers.

Original languageEnglish
Pages (from-to)830-831
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number3
DOIs
Publication statusPublished - 2005 Jan 26

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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