# US 10,121,604 B2 · Nanocomposite of multilayer fullerenes with transition metal oxide nanoparticles and a process for the preparation thereof

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- Number: US 10,121,604 B2
- Document ID: US10121604B2
- Status: Granted
- Kind: B2
- Application number: 15/473,181
- Filed: 2017-03-29
- Published: 2017-07-20
- Granted: 2018-11-06
- Earliest claimed: 2014-11-14
- Assignees: Council of Scientific and Industrial Research
- Applicants: Council of Scientific & Industrial Research
- Inventors: Manjusha Vilas Shelke; Vedi Kuyil Azhagan Muniraj; Mukta Vinayak Vaishampayan
- Web page: https://patentgrep.com/patent/US10121604B2

## CPC

- H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes
- H01G 11/38: Carbon pastes or blends; Binders or additives therein
- H01G 11/44: Raw materials therefor, e.g. resins or coal
- H01G 11/46: Metal oxides
- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01G 11/04: Hybrid capacitors
- Y02E 60/13: Energy storage using capacitors
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed is a simple, cheaper and green approach for low temperature synthesis of functionalized multilayer fullerene from the pure ghee (clarified butter) to obtain activated multishell graphitized non-porous fullerene in the form of nano-onions (CNOs), for fabricating high performance exohedral type of super capacitors by incorporating suitable transition metal oxide. Further, the approach relates to an exohedral type supercapacitor composite, containing non-porous CNOs and transition metal oxide nanoparticles with enhanced specific capacitance in 0.5 M H2SO4.

## Claims

### Claim 1

A process for preparation of a supercapacitor nanocomposite, wherein the said process comprises:
i. collecting thermal black carbon on a glass or ceramic plate directly from a flame of a burning ghee;
ii. annealing the thermal black carbon obtained in step (i) at a temperature of 800° C. under an inert atmosphere to obtain an activated multilayer fullerene in a nano-onions form (CNOs);
iii. dispersing the activated multilayer fullerene in the nano-onions form (CNOs) obtained in step (ii) in water, then adding KMnO4 followed by sonication;
iv. subjecting the mixture obtained from step (iii) to a hydrothermal reaction in a microwave oven at a radiation ranging between 200 W at a temperature of about 130° C. for a period of 15 minutes;
v. cooling the mixture obtained in step (iv) followed by separating a composite by a vacuum filter to a obtain nanocomposite; and
vi. annealing the nanocomposite obtained from step (v) at a temperature of 800° C. under an inert gas for a period of 4 hours to obtain a supercapacitor nanocomposite.

### Claim 2 (depends on 1)

The process as claimed in claim 1, further incorporating a transition metal oxide on the thermal black carbon obtained in step (i) using a microwave hydrothermal reaction.

### Claim 3 (depends on 2)

The process as claimed in claim 2, wherein the transition metal oxide is MnO2.