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Published on: November 11, 2013
Readily Exfoliated TiSe2 Nanosheets for High-Performance Sodium Storage
Dan Zhang1,2,3, Guoqiang Zhao2, Peng Li2
1State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for, Information Technology of Zhejiang Province and, Key Laboratory of Advanced Materials, and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, P. R. China.
Titanium diselenide (TiSe2) nanosheets demonstrate excellent sodium storage capacity and rate capability for energy applications. This study reveals their sodiation/desodiation mechanism, highlighting TiSe2 as a promising 2D nanomaterial.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Sheet-like materials with high surface area are crucial for efficient energy storage.
- Titanium diselenide (TiSe2) is explored for its potential in electrochemical applications.
Purpose of the Study:
- To investigate the sodium storage performance of TiSe2 nanosheets.
- To elucidate the sodiation/desodiation mechanism in TiSe2.
Main Methods:
- Exfoliation of TiSe2 nanosheets via ultrasonication or grinding.
- Electrochemical testing of TiSe2 nanosheets for sodium storage.
- In situ X-ray diffraction (XRD) and ex situ high-resolution transmission electron microscopy (HRTEM) for mechanism study.
Main Results:
- TiSe2 nanosheets achieved a reversible capacity of 147 mAh g⁻¹ at 0.1 A g⁻¹.
- Excellent rate capability was observed, with 103 mAh g⁻¹ at 10.0 A g⁻¹.
- A multi-step intercalation/deintercalation mechanism for sodium storage was identified.
Conclusions:
- TiSe2 nanosheets are effective for sodium-ion energy storage.
- The material exhibits promising electrochemical properties and a well-defined storage mechanism.
- TiSe2 presents potential as a 2D nanomaterial for diverse energy and electronic applications.
