Nanocomposite of multilayer fullerenes with transition metal oxide nanoparticles and a process for the preparation thereof

Patent metadata

Field	Value
Publication number	US-2016141114-A1
Application number	US-201414541536-A
Country	US
Kind code	A1
Filing date	Nov 14, 2014
Priority date	Nov 14, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

Disclosed herein is a simple, cheaper and green approach for low temperature synthesis of functionalized multilayer fullerene from the pure ghee (clarified butter) to get 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 invention relates to an exohedral type supercapacitor composite, comprising non-porous CNOs and transition metal oxide nanoparticles with enhanced specific capacitance in 0.5 M H 2 SO 4 .

First claim

What is claimed is:

1 . A supercapacitor nanocomposite comprising non-porous multilayer fullerenes and transition metal oxide nanoparticles with enhanced specific capacitance in the range of 216-1207 F/g at a scan rate in the range of 100-1 mV/s in H 2 SO 4 .

2 . A supercapacitor nanocomposite as claimed in claim 1 , wherein surface area of non-porous multilayer fullerenes is 486 m 2 /g.

3 . A supercapacitor nanocomposite as claimed in claim 1 , wherein 0.5 H 2 SO 4 is used.

4 . A supercapacitor nanocomposite as claimed in claim 1 , wherein non-porous multilayer fullerenes are carbon nano-onions (CNOs).

5 . A supercapacitor nanocomposite as claimed in claim 1 , wherein the transition metal oxide is MnO 2 .

6 . A supercapacitor nanocomposite as claimed in claim 1 , wherein diameter of metal in the nano-composites exhibit 10 nm.

7 . A process for preparation of supercapacitor nanocomposite as claimed in claim 1 , wherein the said process comprises the steps:
i. collecting thermal black carbon on a glass or ceramic plate directly from the flame of burning ghee; ii. annealing the thermal black carbon as obtained in step (i) at the temperature 800° C. under an inert atmosphere to get activated multilayer fullerene in nano-onions forms (CNOs); iii. dispersing activated multilayer fullerene in nano-onions forms (CNOs) obtained in step (ii) in water then adding KMnO 4 followed by sonication; iv. subjecting the mixture obtained from step (iii) to hydrothermal reaction in microwave oven at the radiation ranging between 200 Wat the temperature 130° C. for a period of 15 min; v. cooling the mixture obtained in step (iv) followed by separating the composite by vacuum filter to get nanocomposites ; vi. annealing the nano-composite obtained from step (v) at the temperature 800° C. under an inert gas for a period of 4 h to obtain supercapacitor nanocomposite.

8 . The process as claimed in claim 7 , optionally incorporating transition metal oxide on thermal carbon black as obtained in step (i) using microwave hydrothermal reaction to obtain nanocomposite and subsequently annealing the obtained composite at 800° C. under an inert atmosphere to get an activated multilayer non-porous, transition metal oxide nanocomposite of CNOs.

Assignees

• Council Scient Ind Res

Inventors

• Shelke Manjusha Vilas
• Muniraj Vedi Kuyil Azhagan
• Vaishampayan Mukta Vinayak

Classifications

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01G11/44

  Raw materials therefor, e.g. resins or coal · CPC title

• H01G11/04

  Hybrid capacitors · CPC title

• H01G11/36 Primary

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title