Ultra‐Wide Interlayered W _x Mo _2x S _y Alloy Electrode Patterning through High‐Precision Controllable Photonic‐Synthesis

Abstract Ultra‐thin 2D materials have great potential as electrodes for micro‐supercapacitors (MSCs) because of their facile ion transport channels. Here, a high‐precision controllable photonic‐synthesis strategy that provided 1 inch wafer‐scale ultra‐thin film arrays of alloyed W _x Mo _2x S _y with sulfur vacancies and expanded interlayer (13.2 Å, twice of 2H MoS ₂ ) is reported. This strategy regulates the nucleation and growth of transition metal dichalcogenides (TMDs) on the picosecond or even femtosecond scale, which induces Mo–W alloying, interlayer expansion, and sulfur loss. Therefore, the diffusion barrier of W _x Mo _2x S _y is reduced, with charge transfer and ion diffusion enhancing. The as‐prepared symmetric MSCs with the size of 100 × 100 µm ² achieve ultrahigh specific capacitance (242.57 mF cm ⁻² and 242567.83 F cm ⁻³ ), and energy density (21.56 Wh cm ⁻³ with power density of 485.13 W cm ³ ). The established synthesis strategy fits numerous materials, which provides a universal method for the flexible synthesis of electrodes in microenergy devices.