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Related Experiment Videos

Octanuclear oxothiomolybdate(v) rings: structure and ionic-conducting properties.

Charlotte du Peloux1, Anne Dolbecq, Philippe Barboux

  • 1Institut Lavoisier, IREM, Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, UMR 8637, 78035 Versailles Cedex, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 24, 2004
PubMed
Summary

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New alkali salts of octanuclear oxothiomolybdate rings show promise as conductors. Lithium salts exhibit excellent proton or lithium-ion conductivity, suggesting applications in energy storage and conversion technologies.

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Octanuclear oxothiomolybdate rings represent a unique class of inorganic clusters.
  • Alkali metal salts of these clusters have been explored for their structural and conductive properties.

Purpose of the Study:

  • To synthesize and characterize alkali salts of novel octanuclear oxothiomolybdate anions.
  • To investigate the ionic conductivity and structural properties of these synthesized materials.
  • To explore potential applications in areas such as proton and lithium-ion conduction.

Main Methods:

  • Synthesis of alkali salts via crystallization from aqueous solutions.
  • Single-crystal X-ray diffraction for structural analysis.
  • Ionic conductivity measurements on pressed pellets.

Related Experiment Videos

  • Proton and lithium-ion conductivity studies as a function of relative humidity and temperature.
  • (7)Li NMR experiments to confirm ion mobility.

    • Main Results:

    • Similar three-dimensional structures were observed for all synthesized alkali salts, with disordered alkali ions forming columns anchoring the anionic rings.
    • Lithium salts of HMo(8)M(3-) (M=Mo, W) demonstrated moderate proton conductivity (sigma=10(-5) S cm(-1)) at room temperature, attributed to surface-proton motion.
    • The lithium salt of Mo(8)ox(2-) exhibited high lithium-ion conductivity (sigma=10(-3) S cm(-1)), comparable to state-of-the-art crystalline lithium conductors.
    • (7)Li NMR confirmed the high mobility of lithium ions within the one-dimensional channels of the Mo(8)ox(2-) salt.

    Conclusions:

    • The synthesized alkali salts of octanuclear oxothiomolybdate rings possess tunable conductive properties.
    • The lithium salt of Mo(8)ox(2-) is a promising candidate for solid-state lithium-ion battery electrolytes.
    • The proton conductivity in HMo(8)M(3-) salts suggests potential for applications in fuel cells or other proton-conducting devices.