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Electrochemical Sodium Ion Intercalation Properties of Na2.7Ru4O9 in Nonaqueous and Aqueous Electrolytes
- Electrochemical Sodium Ion Intercalation Properties of Na2.7Ru4O9 in Nonaqueous and Aqueous Electrolytes
- Jung, YH[Jung, Young Hwa]; Hong, ST[Hong, Seung-Tae]; Kim, DK[Kim, Do Kyung]
- DGIST Authors
- Hong, ST[Hong, Seung-Tae]
- Issue Date
- Journal of the Electrochemical Society, 160(6), A897-A900
- Article Type
- Anodic Peaks; Aqueous Electrolyte; Cyclic Voltammograms; Electrochemical Data; Electrolytes; Metal Ions; Non-Aqueous Electrolytes; One-Dimensional Tunnels; Organic Electrolyte; Reversible Capacity; Solid State Reactions
- This paper represents the first description of the electrochemical sodium ion intercalation properties of Na2.7Ru4O9 in both nonaqueous and aqueous electrolytes. Na2.7Ru4O 9 was synthesized at 700-850°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, Na2.7Ru 4O9 exhibits three anodic peaks during the first charge, similar to the behavior observed in the organic electrolyte. However, the three peaks become a single broad peak over the following cycles. Electrochemical data and ex-situ XRD results indicate that once Na ions are removed from the Na 2.7Ru4O9 structure containing the maximum amount of sodium, only a portion (<60%) can be re-intercalated and that the aqueous electrolyte allows a lower reversible capacity than the nonaqueous electrolyte. © 2013 The Electrochemical Society. All rights reserved.
- Electrochemical Society
- Related Researcher
Hong, Seung Tae
Discovery Lab(Batteries & Materials Discovery Laboratory)
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