Abstract
Ultrathin two-dimensional (2D) porous nanosheets are one of the most promising nanomaterials in various applications, whereas their synthesis is still challenging. Herein, ultrathin 2D amorphous TiO2 (a-TiO2) porous nanosheet aerogel is synthesized via a surfactant-free assembly process followed by low-temperature calcination. The co-existing O—O and —OH groups on the surface of TiO2 precursor break the 3D spherical symmetry, and the hydrogen bonding among the TiO2 precursors is proposed as the main driving force guiding the 2D assembly. The surfactant-free assembly endows the ultrathin a-TiO2 porous nanosheet with improved ionic and electronic conductivity. The porous structure provides high surface area and easy electrolyte penetration, accelerating the Li ion diffusion rate of the a-TiO2 porous nanosheet. Attributing to the above advantages, the obtained a-TiO2 porous nanosheets are one of the best anode materials for lithium-ion batteries, which is proved by the enhanced electrochemical performance.
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