*3.1.2.2. Ultrathin zirconium disulfide nanodiscs*

Except for hard template, soft colloidal templated synthesis is used to prepare two-dimen‐ sional2D materials frequently. The long-chain oleylamine and/or oleic acid surfactants are often used as the soft colloidal templates for directing the crystal growth. Cheon et al. used this method to synthesize ultrathin ZrS2 nanodiscs [36]. Intermediate lamellar complexes composed of 2D arrays of ZrCl4 and alkyl amine are first obtained, in which alkyl amine serves as the soft colloidal template. Then, CS2 is injected into the mixture aforementioned to form ultrathin ZrS2 nanodiscs dispersed in solution.

As indicated in **Figure 6e**–**h**, the resultant ultrathin ZrS2 nanodiscs possess radius of ∼15 nm and thickness of 0.5 nm. The spacing between the discs is ∼1.5 nm (**Figure 6h**), which corre‐ sponds to the length of the oleylamine surfactant layers. When compared to bulk ZrS2, ultrathin ZrS2 discs show the unique nanoscale size effects, enhanced discharge capacity by 230% and greatly improved stability.
