MXene-DERIVED METAL-ORGANIC FRAMEWORKS AND METHOD

Patent metadata

Field	Value
Publication number	US-2022387970-A1
Application number	US-202017771267-A
Country	US
Kind code	A1
Filing date	Oct 23, 2020
Priority date	Nov 4, 2019
Publication date	Dec 8, 2022
Grant date	—

Abstract

A method for making a metal-organic framework, MOF, as nanosheets, includes providing a MXene, wherein the MXene has a general formula of Mn+1XnTx, with n=1-3, M represents an early transition metal, X is C and/or N, and Tx is surface terminations; providing a ligand; mixing the MXene and the ligand in a vessel; heating the MXene and the ligand in the vessel; and forming the MX-MOF nanosheets. The MX-MOF nanosheets have a thickness less than 10 nm.

First claim

1 . A method for making a metal-organic framework, MOF, as nanosheets, the method comprising:
providing a MXene, wherein the MXene has a general formula of M n+1 X n T x , with n=1-3, M represents an early transition metal, X is C and/or N, and T x is surface terminations; providing a ligand; mixing the MXene and the ligand in a vessel; heating the MXene and the ligand in the vessel; and forming the MX-MOF nanosheets, wherein the MX-MOF nanosheets have a thickness less than 10 nm.

2 . The method of claim 1 , wherein the MXene is V 2 CT x .

3 . The method of claim 2 , wherein the ligand is meso-tetra(4-carboxyl-phenyl) porphyrin), H 2 TCPP.

4 . The method of claim 3 , further comprising:
adding a solvent in the vessel before the heating step.

5 . The method of claim 4 , further comprising:
sealing the vessel before the heating step.

6 . The method of claim 5 , wherein the step of heating comprises heating between 120 and 180 ° C.

7 . The method of claim 6 , further comprising:
drying the MX-MOF nanosheets.

8 . The method of claim 1 , wherein M is Ti or V, X is C and/or N, and T x is —F, —O and —OH.

9 . The method of claim 1 , further comprising:
spin coating the MX-MOF nanosheets on a substrate to form a MX-MOF film having a thickness less than 400 nm.

10 . The method of claim 1 , further comprising:
impregnating the MX-MOF nanosheets with a non-volatile acid to enable proton-conducting properties in the MX-MOF nanosheets.

11 . The method of claim 1 , further comprising:
placing the MX-MOF nanosheets, in solid state, between a cathode and an anode of a cell; supplying CO 2 to the cell; and applying electrical energy between the cathode and anode to transform the CO 2 into fuel.

12 . The method of claim 1 , further comprising:
applying the MX-MOF nanosheets between a source, a drain, and a gate deposited on a substrate to form an electric double-layer (EDL) transistor, wherein the EDL is formed at an interface between an ionic conductor and a semiconductor, where the MX-MOF nanosheets are the ionic conductor and the drain and gate are the semiconductor.

13 . An electrochemical cell, comprising:
a housing; an anode located inside the housing; a cathode located inside the housing; and a solid state electrolyte located between the anode and cathode, the solid state electrolyte including a MXene based metal-organic framework, MX-MOF, film, wherein the MX-MOF film includes parallel distributed MX-MOF nanosheets.

14 . The electrochemical cell of claim 13 , wherein the MXene is V 2 CT x .

15 . The electrochemical cell of claim 13 , wherein the housing comprises:
an input for receiving water or a gas; a port for receiving CO 2 ; and an output where the fuel is collected.

16 . The electrochemical cell of claim 13 , further comprising:
a first membrane located between the cathode and the MX-MOF film; and a second membrane located between the anode and the MX-MOF film.

17 . The electrochemical cell of claim 13 , wherein the cathode is coated with a first catalyst that promotes formation of carbon based ions and the anode is coated with a second catalyst that promotes formation of protons.

18 . A transistor comprising:
a substrate; a semiconductor layer formed on the substrate and patterned to form a source S, a drain D, and a gate G; a MXene based metal-organic framework, MX-MOF, film formed over the source S, drain D, and gate G; and an encapsulation layer formed over the MX-MOF film to confine an ionic transport environment within the MX-MOF film.

19 . The transistor of claim 18 , wherein the MXene is V 2 CT x .

20 . The transistor of claim 18 , wherein the MX-MOF film includes parallel distributed MX-MOF nanosheets.

Assignees

• Univ King Abdullah Sci & Tech

Inventors

• Wu Hao
• Shekhah Osama
• Eddaoudi Mohamed
• Alshareef Husam Niman

Classifications

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title

• C25B3/26

  of carbon dioxide · CPC title

• B01J20/3242

  Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group · CPC title

• B01J20/226 Primary

  Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F) · CPC title

• B01J20/28007

  with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like (carbon nanostructures B01J20/205) · CPC title