Crumpled Transition Metal Dichalcogenide Sheets

a technology of transition metal dichalcogenide and sheet metal, which is applied in the direction of electrodes, electrolysis components, electrodes with substrates, etc., can solve the problems of poor stability against nanoparticle coarsening and agglomeration, impose practical limitations, and the functional performance of pt remains inferior, so as to achieve electrochemical stability, reduce the series resistance (rs), and obtain high-efficiency her catalysts. , the effect of high throughpu

Inactive Publication Date: 2019-01-03
NAT TECH & ENG SOLUTIONS OF SANDIA LLC
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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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Lithium Intercalation and Exfoliation and MoS2 Crumpling by EHD

[0022]As an example of the invention, Li-intercalation was accomplished by immersing 2 g of MoS2 powder in 15 mL of 0.8 m n-butyl lithium in hexane. The mixture was stirred vigorously in an Ar-filled glovebox for 96 h. Next, the intercalated compound was transferred to DI-H2O and sonicated to yield exfoliated monolayers. Upon contact with the DI-H2O, copious gas evolved at the interlayer interfaces, thus yielding high concentrations of monolayers and forming a black, opaque solution. After ultrasonication, the compound was washed over Whatman filter paper with 500 mL of hexane. 200 mL of DI-H2O was then added to the mixture. With the filter paper removed, the mixture was then sonicated for 90 min. The resulting solution was then aliquoted into 45 mL centrifuge tubes with solution depths of 2-3 cm and centrifuged at 5200 rcf for 12 h, decanted, and then resuspended in 100 mL of DI-H2O. After resuspension, the centrifugati...

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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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Claims

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Application Information

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Owner NAT TECH & ENG SOLUTIONS OF SANDIA LLC
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