National University of Singapore

Jonghak Lee

Barbaros Ozyilmaz

Barbaros Oezyilmaz

Orhan Kahya

Cagdas Cetin

Yong Kang Ong

Xiao Feng Lim

Clarissa Chui Ling Wong

Antonio Helio Castro Neto

Barbaros Özyilmaz

Srinivasan Natarajan

Arunabha Ghosh

A monolithic carbon foam formed of fused onion-like carbon (OLC) nanoparticles, in which the monolithic carbon foam contains interconnected pores, has a volumetric micropore surface area of 200 m/cc-600 m/cc, and has an electrical conductivity of 20 cm-140 S/cm. Also disclosed are a fractal carbon foam prepared from the monolithic carbon foam, methods of preparing both foams, and supercapacitors constructed therefrom. Specifically, the methods of preparing the foams comprising, inter alia, spark plasma sintering the OLC nanoparticles at a pressure of 30 MPa-1000 MPa and a temperature of 300° C.-800° C. for 2 seconds-30 minutes.

Monolithic and fractal carbon foams and methods of preparing and using same

A monolithic carbon foam formed of fused onion-like carbon (OLC) nanoparticles, in which the monolithic carbon foam contains interconnected pores, has a volumetric micropore surface area of 200 m/cc-600 m/cc, and has an electrical conductivity of 20 s/cm-140 s/cm. Also disclosed are electrodes and energy storage devices constructed therefrom.

A method of making an ordered crystalline product includes hot pressing amorphous carbon at an elevated temperature and pressure to form an ordered crystalline product.

Hot press induced formation of an ordered graphene and few layered graphene sheets

The invention relates to three-dimensional crystalline foams with high surface areas, high lithium capacity, and high conductivity for use as electrode materials and methods for their fabrication. In additional embodiments, the invention also relates to the use of three-dimensional crystalline foams as supercapacitors for improved charge and energy storage.

Synthesis of three-dimensional graphene foam: use as supercapacitors

Hot pressing hollow carbon nanoparticles results in a nano-carbon foam that can be used for energy storage, carbon dioxide capture or water desalination.

Highly dense nano-carbon foam with controlled porosity synthesized from hollow carbon nanoparticles

The application discloses methods of fabricating three-dimensional (3D) graphene crystalline foam, based on mixing a carbon source with a skelet (scaffold) powder. In one embodiment heat and pressure are used to compact the carbon and a metal powder into a close packed structure. In another embodiment a 3D crystalline graphene foam is fabricated with a large surface area (550 m/g) from a 3D metal foam, depositing a layer of graphene using chemical vapor deposition (CVD), depositing a polymer support and removing the metal via wet chemical etching, such that the graphene retains the configuration, and then finally removing the polymer. A method of fabricating the metal foam framework and coating the metal with graphene are also disclosed.

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Singapore, Singapore

Jonghak Lee