Electrochemical Sodium Ion Intercalation Properties of Na2.7Ru4O9 in Nonaqueous and Aqueous Electrolytes
| Na2.7Ru4O9 was synthesized at 700 C ,850 C by solid-state reaction under Ar flow. It has single, double and triple chains of edge-sharing RuO6 octahedra and one-dimensional tunnels between them parallel to the b-axis, accommodating three different sites of Na1, Na2 and Na3. In an organic electrolyte (1 M NaClO4 in PC), Na2.7Ru4O9 shows three redox peaks in its cyclic voltammogram between 2.8 and 3.9 V vs. Na. In an aqueous (1 M Na2SO4) electrolyte, Na2.7Ru4O9 exhibits three anodic peaks during the first charge, similar to the behavior observed in the organic electrolyte. |
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