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Readily Exfoliated TiSe 2 Nanosheets for High-Performance Sodium Storage.
Chemistry : a European Journal 2018 January 25
Materials with sheet-like morphologies are highly desirable candidates for energy storage and conversion applications, due to the confined atomic thickness and high surface area, which would largely improve the electrochemical reaction kinetics. In this work, the sodium storage performance of TiSe2 nanosheets and corresponding sodiation/desodiation reaction mechanism are studied for the first time. TiSe2 nanosheets are readily exfoliated from bulk TiSe2 after quick ultrasonication or grinding. The TiSe2 nanosheets exhibit a reversible capacity of 147 mAh g-1 at 0.1 A g-1 , and show excellent rate capability with a capacity of 103 mAh g-1 at an ultra-high current density of 10.0 A g-1 . The combined in situ XRD and ex-situ HRTEM results suggest that sodium storage in TiSe2 is achieved through a multi-step intercalation/deintercalation mechanism. Besides, TiSe2 might be a promising 2D nanomaterial platform for other energy and electronic applications due to its easy exfoliation and unique physicochemical properties.
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