Water intercalation of sodium cobalt oxides using aqueous permanganate solution

Chia Jyi Liu, Chia Yuan Liao, Wen Ching Hung, Jung Sheng Wang, Hwo Shuenn Sheu

Research output: Contribution to journalArticle

Abstract

We report direct synthesis of the potassium sodium cobalt oxyhydrates (Na,K)x(H2O)yCoO2-δ using the aqueous KMnO4 solution. Two distinct novel phases of (Na,K)x(H2O)yCoO2-δ are synthesized depending on the molar ratio of KMnO4/Na used to treat γ-Na0.7CoO2. Low molar ratio of KMnO4/Na leads to a superconductive phase with c≈19.6 Å, whereas high molar ratio of KMnO4/Na leads to a non-superconductive phase with c≈13.9 Å. According to the chemical analyses, it is found that a partial or even almost complete replacement of K+ for Na+ in the alkaline layers. When using aqueous KMnO4 solution with low molar ratio of KMnO4/Na, the water intercalation is very slow. We also present the XANES spectra on (Na,K)x(H2O)yCoO2-δ. The oxidation state of the Co for the 0.3X sample (c≈19.6 Å) is higher than that of the 40X sample (c≈13.9 Å) with a chemical shift of 3.5 eV.

Original languageEnglish
Pages (from-to)1483-1485
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number5-6
DOIs
Publication statusPublished - 2008 May 1

Fingerprint

cobalt oxides
Intercalation
intercalation
Cobalt
Sodium
sodium
aqueous solutions
Oxides
Water
Chemical shift
water
chemical equilibrium
Potassium
potassium
cobalt
Oxidation
oxidation
synthesis
NaCoO2
permanganic acid

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Liu, Chia Jyi ; Liao, Chia Yuan ; Hung, Wen Ching ; Wang, Jung Sheng ; Sheu, Hwo Shuenn. / Water intercalation of sodium cobalt oxides using aqueous permanganate solution. In: Journal of Physics and Chemistry of Solids. 2008 ; Vol. 69, No. 5-6. pp. 1483-1485.
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Water intercalation of sodium cobalt oxides using aqueous permanganate solution. / Liu, Chia Jyi; Liao, Chia Yuan; Hung, Wen Ching; Wang, Jung Sheng; Sheu, Hwo Shuenn.

In: Journal of Physics and Chemistry of Solids, Vol. 69, No. 5-6, 01.05.2008, p. 1483-1485.

Research output: Contribution to journalArticle

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AU - Liao, Chia Yuan

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AU - Wang, Jung Sheng

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