Ultra-Wide Interlayered W x Mo 2x S y Alloy Electrode Patterning through High-Precision Controllable Photonic-Synthesis.

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.
(© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)