Crumpled Transition Metal Dichalcogenide Sheets

Abstract

An electrohydrodynamic (EHD) method results in charge driven droplet fission and volumetric shrinkage of metal dichalcogenide sheet droplets, thus wrinkling individual exfoliated metal dichalcogenide sheets on the nanoscale. For example, the method can be used to activate the basal plane of solution exfoliated, stable 2H reverted sheets of MoS₂. In this manner, the basal plane of 2H MoS₂ can be strained at an unprecedented scale (3.7%), resulting in charge transport to basal plane defects. The resulting crumpled MoS₂ integrates few layer sheets and atomistic defects with nano- and micro-scale ridges and vertices to enable centimeter-length films that elevate the catalytic site count of MoS₂ from 1.0×10¹⁴ sites/cm² to 2.93×10¹⁷ sites/cm² (planar 2H vs. crumpled 2H) and a turn-over-frequency (TOF) from 0.016 s⁻¹ to 0.130 s^−1.

Description

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AI Technical Summary

Benefits of technology

The invention is a method for making a new type of material called crumpled MoS2, which is stable and highly efficient at electrochemical reactions. This material is made by creating 2D sheets of MoS2 and then transforming them into 3D structures using a process called electrohydrodynamic (EHD) induced dimensional transition. The crumpled structure has a unique structure that allows for better access to the surface area and efficient charge transfer, resulting in highly efficient electrochemical reactions. The material can be easily integrated into fuel cells and other applications.

Problems solved by technology

The technical problem addressed in this patent text is how to improve the function of molybdenum sulfide (MoS₂) materials as efficient alternatives to platinum group metal (Pt)-based materials for several important chemical reactions such as oxidation reduction, deformation, and hydrogen evolution reaction (HER). While there have been attempts to utilize other methods like strain engineering and phase transformation, they come with their own challenges including slow response times, difficulty in achieving complete conversion, and potential loss of effectiveness when integrated into multi-layer devices.

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