NUS Enterprise

Highly Dense Graphene Foam With Controlled Pore Size And High Surface Area, Synthesized From Hollow Carbon Nanoparticles Through Atomic Diffusion Under High Pressure At An Elevated Temperature

Technology #14242n

Nano-Carbon Foam for High Energy Density Supercapacitor Electrode and Carbon Capture and Storage Applications

Prof. Barbaros Öezyilmaz, Arunabha Ghosh, Dr. Lee Jonghak, Srinivasan Natarajan, Prof. Antonio Helio Castro Neto

Industry Problem

To achieve a high performance supercapacitor, we need materials with high surface area, along with high material density and superior conductivity. However, surface area and material density are inversely proportional characteristics of a material. In particular, porous materials have high surface area, but lack a large material density and hence exhibit a poor electrical conductivity. In addition, the complex, multi-step fabrication processes for supercapacitor electrodes/nano-carbon foam involving chemical reagents is time consuming and expensive.

Solution

Prof. Barbaros’ group from the Department of Physics has developed a high surface area and highly conductive porous nano-carbon foam for supercapacitor electrodes and carbon capture and storage applications. The nano-carbon foam is fabricated by a single-step process without chemical reagents. The conventional supercapacitor electrode is fabricated using activated carbon precursor and requires mixing with binders and conductive agents to bind the activated carbon particles together and increase its’ conductivity. In contrast, our developed nano-carbon foam does not require any binders or conductive additives due to our unique processing method, resulting in a superior energy and power densities (see Fig. 1 & Table 1). In addition, the developed nano-carbon foam shows good carbon capture and storage performance (see Fig. 2 & Table 2).




FIG. 1: Superior energy and power density achieved compared to commercial supercapacitors







FIG. 2: Carbon capture and storage performance ( 0 – 65 bar)

Capacitance

(F/g)

Potential window

(V)

Gravimetric

Energy density

(Wh/Kg)

Gravimetric

Max. Power density (W/kg)

Volumetric

Energy density

(Wh/L)

Vol. Max

Power density (W/L)

251

4

138.45

1.98 x 106

111.2

1.41 x 106

Table 1. Supercapacitor Performance Summary

Surface area (m2/g)

CO2 storage per unit amount

of absorbents  (milli-mol/g)

1139

23 @ 65 bar

Table 2: CO2 storage performance

Value Proposition

  • Nano-carbon foam supercapacitor electrode without additives or binders delivering superior energy density (30 Wh kg-1) and high power density (>105 W kg-1).
  • Nano-carbon foam can also be used for carbon capture and storage, (23 milli-mol CO2/g at 65 bar).
  • Simple and fast single-step fabrication process without chemical reagents (ie. no conductive additives or binders).
  • Fabrication process utilizes conventional equipment and raw materials.

Potential Applications

  • Supercapacitor electrode
  • Carbon capture and storage
  • Water desalination

 For more information contact: NUS Industry Liason Office

  +65 6516 7175/+65 6601 2812

  iloquery@nus.edu.sg/tan.yan.ny@nus.edu.sg

Case Manager: Dr. Tan Yan Ny

ILO Ref : 14242N

Principal Investigator: Prof Barbaros Öezyilmaz

Acknowledgement: This research is supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP 9-2011-03)