nanomaterials have been discovered and extensively studied, such as metal oxides, [9] transition-metal dichalcogenides (TMDs), [10][11][12] layered double hydroxides (LDHs), [13,14] 2D covalent organic frameworks (COFs), [15,16] 2D metal-organic frameworks (MOFs), [17,18] silicene, [19] germanene, [20,21] black phosphorene, [22][23][24] arsenene, [25][26][27][28] stanene, [29] borophene, [30,31] carbon nitride, [32,33] hexagonal boron nitride, [34][35][36] and Mxene, [37][38][39] etc. As an emerging class of nanoscale materials, 2D nanomaterials show unprecedented properties that are unparalleled compared to their corresponding bulk materials, which gives these materials promising applications in a wide range of areas, including high-speed electronic and optical devices, actuators and sensors, energy conversion and storage devices, DNA sequencing, and so on.