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

Research output: Contribution to journalArticle

15 Citations (Scopus)

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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Sodium
Oxidation
Poisons
Immersion
Cobalt
Powders
Molecules
Water

All Science Journal Classification (ASJC) codes

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

Cite this

Liu, Chia-Jyi ; Hung, Wen Chin ; Wang, Jung Sheng ; Liu, Chia Jung Charlie. / Preparation of superconducting Nax(H2O) yCoO2 using NaMnO4 as the deintercalation and oxidation agent. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 3. pp. 830-831.
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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 {\AA} phase with bilayers of water molecules intercalated between the CoO2 layers and sodium layers because of the absence of K+ in the Na+ layers.",
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Preparation of superconducting Nax(H2O) yCoO2 using NaMnO4 as the deintercalation and oxidation agent. / Liu, Chia-Jyi; Hung, Wen Chin; Wang, Jung Sheng; Liu, Chia Jung Charlie.

In: Journal of the American Chemical Society, Vol. 127, No. 3, 26.01.2005, p. 830-831.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Preparation of superconducting Nax(H2O) yCoO2 using NaMnO4 as the deintercalation and oxidation agent

AU - Liu, Chia-Jyi

AU - Hung, Wen Chin

AU - Wang, Jung Sheng

AU - Liu, Chia Jung Charlie

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N2 - 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.

AB - 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.

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