Featured Research

from universities, journals, and other organizations

Enhanced yet affordable material for supercapacitors

Date:
July 8, 2013
Source:
Ulsan National Institute of Science and Technology(UNIST)
Summary:
Scientists have developed a new method to massively synthesize enhanced yet affordable materials for supercapacitors.

3D mesoporous graphene.
Credit: UNIST

Researchers from Ulsan National Institute of Science and Technology (UNIST) developed a new method to massively synthesize enhanced yet affordable materials for supercapacitors.

Supercapacitors have attracted increasing attention due to their long life cycle, highly reversible charge storage process and specific power density along with increased concern over the exhaustion of natural resources.

Graphene has been recognized as a promising active material for supercapacitors due to its outstanding electrical conductivity and large surface area, as they are the two most important requirements for supercapacitors.

Among the various methods for the fabrication of graphene sheets, the chemical vapor deposition (CVD) technique is highly recommended due to the high conductivity of as-prepared graphene. But the scalability is still needed for commercialization. Additionally these limitations called for great interest on further improvement.

The research team led by Prof. Ji-Hyun Jang from UNIST, previously reported a novel approach to synthesize chemical vapor deposition-grown three-dimensional graphene nano-networks (3-D GNs) that can be mass produced while retaining the excellent properties of 2D graphene and published in the (Nature Publishing Group) Scientific Reports in May 2013.

Here, Prof. Jang extended her previous research in Scientific Reports and demonstrated a unique route to obtain a mass-producible mesoporous graphene nano-ball (MGB) with a large surface area and great conductivity, via precursor-assisted CVD, using metal precursors as a catalyst which is applicable to supercapacitors.

Prof. Ji-Hyun Jang is from the Interdisciplinary School of Green Energy at UNIST and the fellow researchers include Jung-Soo Lee, Sun-I Kim and Jong-Chul Yoon from the Interdisciplinary School of Green Energy at UNIST.

Compared to the conventional graphene synthesis methods, a new way, suggested by the UNIST research group, is scalable and able to produce high quality and customizable graphene with better environmental impacts.

With the resulting materials, mesoporous graphene balls, the capacity of supercapacitor has been improved significantly. Due to the unique mesoporous structure, three-dimensional networks are formed, which help to improve conductivity. Furthermore, mesopores inside the graphene surfaces induce nanochannels to transport ions in electrolyte, and improve the properties of supercapacitor.

The MGB presents a specific surface area of 508 m2/g and mesoporosity with a mean pore diameter of 4.27 nm. The conductivity of the p-doped MGB obtained from more than 10 samples was 6.5 S/cm. The MGB-based supercapacitor shows good performance, including an excellent capacitance of 206 F/g and 96% retention of capacitance after 10,000 cycles even at a high current density.

"Our work is very meaningful since we succeed in the fabrication of CVD-grown graphene with high qualities on a gram scale," said Prof. Jang. "When the mesoporous graphene balls are used as an electrode material for supercapacitor, it proves great potential for energy storage devices with high efficiency."

She also said "If the properties of mesoporous graphene are improved further by continuous research, developing an electric vehicle with high power will become a realization not just a dream," showing their future research plan.

This research was supported by National Research Foundation (NRF) and the local science park by the Ulsan metropolitan city. It was published in ACS nano (Title: Chemical vapor deposition of mesoporous graphene nano-balls for supercapacitor ).


Story Source:

The above story is based on materials provided by Ulsan National Institute of Science and Technology(UNIST). Note: Materials may be edited for content and length.


Journal Reference:

  1. Jung-Soo Lee, Sun-I Kim, Jong-Chul Yoon, Ji-Hyun Jang. Chemical Vapor Deposition of Mesoporous Graphene Nanoballs for Supercapacitor. ACS Nano, 2013; 130625132211006 DOI: 10.1021/nn401850z

Cite This Page:

Ulsan National Institute of Science and Technology(UNIST). "Enhanced yet affordable material for supercapacitors." ScienceDaily. ScienceDaily, 8 July 2013. <www.sciencedaily.com/releases/2013/07/130708103519.htm>.
Ulsan National Institute of Science and Technology(UNIST). (2013, July 8). Enhanced yet affordable material for supercapacitors. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2013/07/130708103519.htm
Ulsan National Institute of Science and Technology(UNIST). "Enhanced yet affordable material for supercapacitors." ScienceDaily. www.sciencedaily.com/releases/2013/07/130708103519.htm (accessed September 23, 2014).

Share This



More Matter & Energy News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Will Living Glue Be A Thing?

Will Living Glue Be A Thing?

Newsy (Sep. 23, 2014) Using proteins derived from mussels, engineers at MIT have made a supersticky underwater adhesive. They're now looking to make "living glue." Video provided by Newsy
Powered by NewsLook.com
Company Copies Keys From Photos

Company Copies Keys From Photos

Newsy (Sep. 22, 2014) A new company allows customers to make copies of keys by simply uploading a couple of photos. But could it also be great for thieves? Video provided by Newsy
Powered by NewsLook.com
The Hyped-Up Big Bang Discovery Has A Dust Problem

The Hyped-Up Big Bang Discovery Has A Dust Problem

Newsy (Sep. 22, 2014) An analysis of new satellite data casts serious doubt on a previous study about the Big Bang that was once hailed as revolutionary. Video provided by Newsy
Powered by NewsLook.com
Rockefeller Oil Heirs Switching To Clean Energy

Rockefeller Oil Heirs Switching To Clean Energy

Newsy (Sep. 22, 2014) The Rockefellers — heirs to an oil fortune that made the family name a symbol of American wealth — are switching from fossil fuels to clean energy. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins