Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China.
Nanoscale. 2019 Feb 14;11(7):3200-3207. doi: 10.1039/c8nr09326a.
Two-dimensional (2D) metal oxide (MO) nanomaterials, like graphene, possess unique electrical, mechanical, optical and catalytic performances, and have attracted substantial research interest recently. However, it remains a challenge to easily obtain 2D MO nanosheets by a generalized synthetic pathway. Here, we report a general and facile strategy for the synthesis of 2D MO nanosheets induced by nonionic surfactant micelles. Notably, the novel strategy primarily relies on the thermoregulated phase transition of the micelles. The resulting 2D MO nanosheets show high specific surface areas. As a demonstration, Sb2O3 nanosheets synthesized by our method as anodes for sodium-ion batteries (SIBs) have a high reversible capacity of 420 mA h g-1 and a high capacity retention of 99% after 150 cycles at 0.1 A g-1. Mn3O4 nanosheets for supercapacitors have a remarkable specific capacitance of 127 F g-1 at a current density of 0.5 A g-1. Even at a large current density of 5 A g-1 after 10 000 cycles, 96% of the specific capacitance is retained, demonstrating the remarkable performance of these nanosheets for energy storage applications.
二维（2D）金属氧化物（MO）纳米材料，如石墨烯，具有独特的电学、力学、光学和催化性能，最近引起了广泛的研究兴趣。然而，通过通用的合成途径轻松获得 2D MO 纳米片仍然是一个挑战。在这里，我们报告了一种由非离子表面活性剂胶束诱导合成 2D MO 纳米片的通用且简便的策略。值得注意的是，该新策略主要依赖于胶束的热调节相转变。所得到的 2D MO 纳米片具有高的比表面积。作为一个演示，我们通过该方法合成的 Sb2O3 纳米片作为钠离子电池（SIB）的阳极，在 0.1 A g-1 下循环 150 次后具有 420 mA h g-1 的高可逆容量和 99%的高容量保持率。用于超级电容器的 Mn3O4 纳米片在 0.5 A g-1 的电流密度下具有显著的比电容为 127 F g-1。即使在 10000 次循环后在 5 A g-1 的大电流密度下，仍保留 96%的比电容，这表明这些纳米片在储能应用方面具有卓越的性能。
