Электронный каталог

Статья

Suslov, Ev.A.
Effect of Cobalt on Structural and Electrochemical Properties of the TiSe&sub(2) System and its Sodiation / Ev.A.Suslov, M.S.Postnikov, S.V.Sumnikov, R.N.Vasin, E.A.Korneeva, N.Yu.Samoylova, [a.o.] // The Journal of Physical Chemistry C [Electronic resource]. – 2023. – Vol. 127, No. 47. – P. 22889-22896. – URL: https://doi.org/10.1021/acs.jpcc.3c05126.

This work focuses on investigating the phase equilibria in Na&sub(n)Co&sub(x)TiSe&sub(2) (0 ≤ n ≤ 3; x = 0.1, 0.2, 0.25, 0.33, 0.4, and 0.5) systems. For this purpose, TiSe&sub(2), Co&sub(0.1)TiSe&sub(2), and Co&sub(0.33)TiSe&sub(2) compounds were synthesized with subsequent electrochemical intercalation of sodium. The obtained compounds were investigated by electrochemical (coulometric titration), scanning electron microscopy, and diffraction methods (ex situ and in situ/operando X-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 Na&sub(n)TiSe&sub(2) system. The investigation revealed that the introduction of cobalt through preintercalation into the TiSe&sub(2) matrix leads to notable simplification in the phase regions of the system. Specifically, the NanTiSe2 system exhibited five single-phase regions, while Na&sub(n)Co&sub(0.1)TiSe&sub(2) and Na&sub(n)Co&sub(0.33)TiSe&sub(2) exhibited 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&sup(–1) (Na&sub(2.3)TiSe&sub(2)), 172 mA h g&sup(–1) (Na&sub(1.6)Co&sub(0.1)TiSe&sub(2)), and 197 mA h g–1 (Na2.0Co0.33TiSe&sub(2)).



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 44 г - Физико-химические методы анализа элементов. Анализ с помощью ядерных методов
Спец.(статьи,препринты) = С 332.8 - Синхротронное излучение. Лазеры на свободных электронах. Получение и использование рентгеновских лучей
Бюллетени = 15/024