Molybdenum doped carbon nanotube and graphene nanocomposite electrodes

Patent metadata

Field	Value
Publication number	US-2023268137-A1
Application number	US-202217677492-A
Country	US
Kind code	A1
Filing date	Feb 22, 2022
Priority date	Feb 22, 2022
Publication date	Aug 24, 2023
Grant date	—

Abstract

A nanocomposite electrode and a supercapacitor device including said nanocomposite electrode. The nanocomposite electrode includes a mixture of at least one binding compound, at least one conductive additive, and at least one molybdenum doped carbon material coated onto a substrate. The supercapacitor device includes two nanocomposite electrodes disposed facing one another, wherein the substrate of each nanocomposite electrode is coated with the mixture on an inside facing surface and the outer surfaces of the nanocomposite electrodes are not coated with the mixture, and the inside facing surfaces are separated by at least one electrolyte.

First claim

1 : A nanocomposite electrode, comprising:
a substrate; at least one binding compound; at least one conductive additive; and at least one molybdenum doped carbon material; wherein a mixture of 5-10 wt % of the binding compound, 65-92 wt % of the conductive additive, and 3-25 wt % of the molybdenum doped carbon material based on the total weight of the binding compound, conductive additive, and molybdenum doped carbon material, at least partially coats a surface of the substrate.

2 : The nanocomposite electrode of claim 1 , wherein:
the molybdenum doped carbon material is at least one selected from the group consisting of molybdenum doped graphene and molybdenum doped carbon nanotubes (CNTs); the binding compound is at least one selected from the group consisting of polyvinylidene fluoride and n-methylpyrrolidone; the conductive additive is at least one selected from the group consisting of graphite, activated carbon, reduced graphene oxide, carbon nanotubes, carbon nanofibers, and carbon black; and the substrate is a formed from at least one material selected from the group consisting of copper, aluminum, nickel, iron, and steel.

3 : The nanocomposite electrode of claim 1 , wherein:
the molybdenum in the molybdenum doped carbon material is at least one selected from the group consisting of α-MoO 3 , β-MoO 3 , and γ-MoO 3 .

4 : The nanocomposite electrode of claim 1 , wherein:
molybdenum is homogeneously distributed throughout the molybdenum doped carbon material.

5 : The nanocomposite electrode of claim 1 , wherein:
the molybdenum doped carbon material is molybdenum doped graphene; the graphene of the molybdenum doped carbon graphene has a sheet structure; the molybdenum is on a surface of sheets of the sheet structure; and the molybdenum doped graphene comprises 70-80 wt % C, 15-20 wt % O, 4-8 wt % H, and 3-10 wt % Mo, based on the total weight of the C, O, H, and Mo.

6 : The nanocomposite electrode of claim 1 , wherein:
the molybdenum doped carbon material is molybdenum doped CNTs; the molybdenum doped CNTs have a diameter of 10-100 nm; the molybdenum is on walls of the CNTs; and the molybdenum doped CNTs comprise 60-70 wt % C, 20-25 wt % O, 4-8 wt % H, and 10-20 wt % Mo, based on the total weight of the C, O, H, and Mo.

7 : The nanocomposite electrode of claim 1 , wherein:
the thickness of the coating of the mixture on the substrate is 500 nm-60 μm.

8 : The nanocomposite electrode of claim 1 , wherein the molybdenum doped carbon material is made by a method comprising:
heating a carbon material to at least 450° C. for 10 minutes to an hour to form a cracked carbon material;
wherein the carbon material is carbon nanotubes or graphene;
sonicating the cracked carbon material in water for at least 5 minutes to form a dispersion; adjusting the pH of the dispersion to 1.5-3 with an acid to form a suspension; mixing MoO 4 2− molybdate ion into the suspension and stirring for at least 48 hours at 20-25° C. to form a solution; filtering, washing with water, and drying the solution at a temperature of at least 70° C. for at least 3 hours, to form the molybdenum doped carbon material.

9 : A supercapacitor device comprising the nanocomposite electrode of claim 1 , wherein the supercapacitor device comprises:
two of the nanocomposite electrodes disposed facing one another, wherein the substrate of each nanocomposite electrode is at least partially coated with the mixture on an inside facing surface and the outer surfaces of the nanocomposite electrodes are not coated with the mixture; and the inside facing surfaces are separated by at least one electrolyte.

10 : The supercapacitor device of claim 9 , wherein:
the electrolyte is at least one polyol compound mixed with at least one selected from the group consisting of an alkali metal hydroxide, an alkaline earth hydroxide, an alkali metal salt, and an alkaline earth salt; wherein the polyol compound is at least one selected from the group consisting of glycerol, ethylene glycol, and propylene glycol.

11 : The supercapacitor device of claim 9 , having:
an energy density of 40-60 Wh/kg at a specific power of 250-300 W/kg; and wherein the mixture has 15-25 wt % molybdenum doped carbon material; and the molybdenum doped carbon material is molybdenum doped graphene.

12 : The supercapacitor device of claim 11 , having:
a specific capacitance of 450-500 F/g at 0.5-5 A/g.

13 : The supercapacitor device of claim 12 , wherein:
at least 90% of the initial specific capacitance is maintained after 10,000 charge-discharge cycles.

14 : The supercapacitor device of claim 9 , having:
an energy density of 30-50 Wh/kg at a specific power of 250-300 W/kg; wherein the mixture has 15-25 wt % molybdenum doped carbon material; and the molybdenum doped carbon material is molybdenum doped carbon nanotubes.

15 : The nanocomposite electrode of claim 14 , having:
a specific capacitance of 450-500 F/g at 0.5-5 A/g.

16 : The supercapacitor device of claim 15 , wherein:
at least 88% of the initial specific capacitance is maintained after 10,000 charge-discharge cycles.

17 : A wearable device comprising the supercapacitor device of claim 9 , wherein:
the supercapacitor device is electrically connected to a sensor; and the supercapacitor device functions as a battery.

18 : The supercapacitor device of claim 9 , comprising:
2-10 of the supercapacitor devices connected in parallel and/or series.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Asiri Sarah Mousa Maadi
• Cevik Emre
• Bozkurt Ayhan

Classifications

• H01G11/56

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

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/46

  Metal oxides · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title