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.

超薄二维（2D）多孔纳米片是各种应用中最有前途的纳米材料之一，但它们的合成仍然具有挑战性。在此，超薄二维无定形 TiO ₂ (a-TiO ₂ ) 多孔纳米片气凝胶是通过无表面活性剂组装工艺和低温煅烧合成的。_{TiO 2}表面共存的 O-O 和 -OH 基团前驱体打破了 3D 球对称性，并且 TiO2 前驱体之间的氢键被认为是指导 2D 组装的主要驱动力。无表面活性剂的组装赋予超薄 a-TiO2 多孔纳米片以改进的离子和电子电导率。多孔结构提供了高表面积和易于电解质渗透，加速了a-TiO ₂多孔纳米片的Li离子扩散速率。由于上述优点，所获得的a-TiO ₂多孔纳米片是锂离子电池的最佳负极材料之一，这通过增强的电化学性能得到证明。