Designing a high-performance capacitive deionization setup is limited due to the slow salt removal and charge storage capacities. Efforts are being made to replace traditional electrodes with advanced 2D materials. We introduce a simple method for synthesizing two-dimensional titanium dioxide graphene-like nanosheets via a unique air-gap-assisted solvothermal method. Crystalline 2D graphene-like anatase-TiO₂ sheets of unprecedented quality were obtained by tuning the air gap in the solvothermal reactor. The 2D TiO₂ synthesized by air-gap-assisted solvothermal process has shown an exceptionally high surface area of 934.5 m²/g compared to the pristine TiO₂ (249.5 m²/g). The sheets were used as Faradaic electrodes in ion-electrosorption and their capacitive deionization capabilities were evaluated. The electrochemical conductivity was examined via an in situ investigation of Na⁺-ion migration and storage. The adsorption capacity of 2D TiO₂ sheets increased with higher applied potential while keeping the adsorption time constant at 15 min. At adsorption potentials of –0.8 V, –1.0 V, and –1.2 V, desalting rates of 2.09, 2.18, and 2.20 mg g⁻¹ min⁻¹ resulted in adsorption capacities of 31.33, 32.73, and 33.023 mg g^–1, respectively. The 2D TiO₂ electrode demonstrated high electron-transfer rates, a large desalination capacity, and a rapid average desalting rate. The specific capacity of the 2D-layered TiO₂ electrode was found to be about 45.68 F g⁻¹. These results can be attributed to the large specific surface area, short ionic diffusion paths, numerous active adsorption sites, surface defects, and pseudocapacitance. This air-gap-assisted solvothermal method is expected to open new avenues for the synthesis of high-quality 2D materials.

由于除盐速度和电荷存储能力较慢，设计高性能电容去离子装置受到限制。人们正在努力用先进的二维材料取代传统电极。我们介绍了一种通过独特的气隙辅助溶剂热法合成二维二氧化钛石墨烯类纳米片的简单方法。通过调节溶剂热反应器中的气隙，获得了前所未有的质量的结晶二维石墨烯类锐钛矿-TiO ₂片。与原始TiO ₂ (249.5 m ² /g) 相比，通过气隙辅助溶剂热法合成的2D TiO 2 显示出934.5 m 2 /g 的_极高^表面积。这些片材用作离子电吸附中的法拉第电极，并评估了它们的电容去离子能力。通过原位研究 Na ⁺离子迁移和储存来检查电化学电导率。 2D TiO ₂片的吸附容量随着施加的电势的增加而增加，同时保持吸附时间恒定在15分钟。在吸附电位为 –0.8 V、–1.0 V和–1.2 V 时，脱盐率为 2.09、2.18 和 2.20 mg g ⁻¹  min ⁻¹时，吸附容量分别为 31.33、32.73 和 33.023 mg g ^–1。 2D TiO ₂电极表现出高电子转移速率、大脱盐能力和快速的平均脱盐速率。发现2D层状TiO ₂电极的比容量为约45.68F g ^-1。这些结果可归因于大的比表面积、短的离子扩散路径、大量的活性吸附位点、表面缺陷和赝电容。这种气隙辅助溶剂热方法有望为合成高质量二维材料开辟新途径。