Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles
By combining the powers of two single-atom-thick carbon structures, researchers at the George Washington University‘s Micro-propulsion and Nanotechnology Laboratory have created a new ultracapacitor that is both high performance and low cost.
The device, described in the Journal of Applied Physics, capitalizes on the synergy brought by mixing graphene flakes with single-walled carbon nanotubes, two carbon nanostructures with complementary properties.
Ultracapacitors are souped-up energy storage devices that hold high amounts of energy and can also quickly release that energy in a surge of power. By combining the high energy-density properties of batteries with the high power-density properties of conventional capacitors, ultracapacitors can boost the performance of electric vehicles, handheld electronics, audio systems and more.
Single-walled carbon nanotubes and graphene both have unique and excellent electronic, thermal, and mechanical properties that make them attractive materials for designing new ultracapacitors, said Jian Li, first author on the paper. Many groups had explored the use of the two materials separately, but few had looked at combining them, he said.
“In our lab we developed an approach by which we can obtain both single-walled carbon nanotubes and graphene, so we came up with the idea to take advantage of the two promising carbon nanomaterials together,” added Michael Keidar, a professor in the Department of Mechanical and Aerospace Engineering in the School of Engineering and Applied Science at GW, and director of the Micro-propulsion and Nanotechnology Laboratory.
The researchers synthesized the graphene flakes and nanotubes by vaporizing a hollow graphite rod filled with metallic catalyst powder with an electric arc. They then mixed the two nanostructures together to form an ink that they rolled onto paper, a common separator for current commercial capacitors.
The combination device’s specific capacitance, a measurement of the performance of a capacitor per unit of weight, was three times higher than the specific capacitance of a device made from carbon nanotubes alone.
The advantage of the hybrid structure, Li explained, is that the graphene flakes provide high surface area and good in-plane conductivity, while the carbon nanotubes connect all of the structures to form a uniform network.
While other types of ultracapacitors have also achieved the high specific capacitance of the graphene/nanotube hybrid, the researchers say, the main advantage of the combination approach is its low costs, since the team has developed a simple way to manufacture large amounts of the desirable mix of carbon nanostructures.
The hybrid ultracapacitor is also small and light, an advantage as electronic devices get ever smaller.
The Latest on: Ultracapacitors
via Google News
The Latest on: Ultracapacitors
- Ultracapacitors Might Have Bad Fruity Smellon November 23, 2020 at 4:00 pm
You might think the smell of an electrolytic capacitor boiling out is bad, but if scientists from the University of Sydney have their way, that might be nothing. They’ve devised an ...
- Building A Portable Solar Powered Spot Welder: Charging Supercapacitorson November 22, 2020 at 4:00 pm
Supercapacitors (often called ultracapacitors) fill a niche somewhere between rechargeable lithium cells and ordinary capacitors. Ordinary capacitors have a low energy density, but a high power ...
- Global Supercapacitors and Ultracapacitors Market 2020 Analysis by Key Players, End-User, Type, Application, Regions and Forecast to 2026on November 17, 2020 at 12:51 pm
The latest market research report titled Global Supercapacitors and Ultracapacitors Market 2020 by Manufacturers, Regions, Type and Application, Forecast to 2026 reveals the overview of the global ...
- Ultracapacitors Market New Report: Growth Drivers, Challenges, Trends And Market Dynamics Forecast 2025on October 28, 2020 at 7:50 pm
Final Report will add the analysis of the impact of COVID-19 on this industry." Global “Ultracapacitors Market” ...
- Maxwell and the Promise of Ultracapacitorson October 27, 2020 at 12:00 pm
Policy & regulation are aligning with renewables cost declines to make projects more profitable and portfolios more sustainable. The Grid Edge comprises technologies, solutions and business models ...
- Richardson Electronics Now Offering Pureechem Ultracapacitorson October 22, 2020 at 4:00 am
LAFOX, Ill., Oct. 22, 2020 (GLOBE NEWSWIRE) -- Richardson Electronics, Ltd. (NASDAQ: RELL) announced today the availability of Pureechem ultracapacitors. Located in Chungcheongbuk-do Korea ...
- 5.11's revolutionary flashlight re-charges in 90 seconds, operates without batteries and lasts virtually foreveron October 21, 2020 at 5:00 pm
This technology utilizes environmentally friendly ultracapacitors that work together with revolutionary computer circuitry to efficiently manage how energy is loaded into the flashlight ...
via Bing News