دورية
Effect of Cobalt on Structural and Electrochemical Properties of the TiSe2System and Its Sodiation
| العنوان: | Effect of Cobalt on Structural and Electrochemical Properties of the TiSe2System and Its Sodiation |
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| المؤلفون: | Suslov, Evgeniy A., Postnikov, Mikhail S., Titov, Alexander N., Sumnikov, Sergei V., Vasin, Roman N., Korneeva, Ekaterina A., Bobrikov, Ivan A., Samoylova, Nataliya Yu. |
| المصدر: | The Journal of Physical Chemistry - Part C; November 2023, Vol. 127 Issue: 47 p22889-22896, 8p |
| مستخلص: | This work focuses on investigating the phase equilibria in NanCoxTiSe2(0 ≤ n≤ 3; x= 0.1, 0.2, 0.25, 0.33, 0.4, and 0.5) systems. For this purpose, TiSe2, Co0.1TiSe2, and Co0.33TiSe2compounds were synthesized with subsequent electrochemical intercalation of sodium. The obtained compounds were investigated by electrochemical (coulometric titration), scanning electron microscopy, and diffraction methods (ex situand in situ/operandoX-ray diffraction). By utilizing electrochemical and X-ray data, this study successfully determined the boundaries of structural phases, thereby significantly enhancing the comprehension of the NanTiSe2system. The investigation revealed that the introduction of cobalt through preintercalation into the TiSe2matrix leads to notable simplification in the phase regions of the system. Specifically, the NanTiSe2system exhibited five single-phase regions, while NanCo0.1TiSe2and NanCo0.33TiSe2exhibited two single-phase regions each. This effect is associated with stabilization of the trigonal crystal structure of the host lattice due to the presence of a strong covalent bond between Co and Ti within the host lattice. Additionally, the effective sodium capacity of the studied systems was observed to be 236 mA h g–1(Na2.3TiSe2), 172 mA h g–1(Na1.6Co0.1TiSe2), and 197 mA h g–1(Na2.0Co0.33TiSe2). |
| قاعدة البيانات: | Supplemental Index |
Find this issue from the American Chemical Society | تدمد: | 19327447 19327455 |
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| DOI: | 10.1021/acs.jpcc.3c05126 |