Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > Press > Michigan Tech Scientist's Discovery Could Lead to a Better Capacitor

The non-aligned manganese dioxide nanorods on the left were made using conventional methods. The aligned nanorods on the right were grown in Dennis Desheng Meng's lab using electrophoretic deposition. Photos by Sunand Santhanagopalan
The non-aligned manganese dioxide nanorods on the left were made using conventional methods. The aligned nanorods on the right were grown in Dennis Desheng Meng's lab using electrophoretic deposition. Photos by Sunand Santhanagopalan

Abstract:
A new process for growing forests of manganese dioxide nanorods may lead to the next generation of high-performance capacitors.

Michigan Tech Scientist's Discovery Could Lead to a Better Capacitor

Houghton, MI | Posted on April 16th, 2013

As an energy-storage material for batteries and capacitors, manganese dioxide has a lot going for it: it's cheap, environmentally friendly and abundant. However, chemical capacitors made with manganese dioxide have lacked the power of the typical carbon-based physical capacitor. Michigan Technological University scientist Dennis Desheng Meng theorized that the situation could be improved if the manganese dioxide were made into nanorods, which are like nanotubes, only solid instead of hollow. However, a stumbling block has been making manganese dioxide nanorods with the right set of attributes. Until now, researchers have been able to grow nanorods that either have the best crystalline structure or were aligned, but not both.

Now, Meng's research group has developed a technique to grow manganese dioxide nanorods that are not only straight and tall (at least by nano-standards), but also have the optimal crystal structure, known as α-MnO2.

This minimizes the internal resistance, allowing the capacitor to charge and discharge repeatedly without wearing out. That's a recipe for a better capacitor: it can store more energy, extract that energy more quickly, and work longer between rechargings. Plus, it can be used over and over again. Even after Meng's group recharged their capacitor more than 2,000 times, it was still able to regain over 90 percent of its original charge.

Meng's device belongs to the family of chemical, or reduction-oxidation, capacitors. They are hybrids between physical supercapacitors, which release a burst of energy and discharge quickly, and batteries, which generally store more energy and release it gradually over a longer period. Typically, chemical capacitors have more energy and less power than the physical ones.

The chemical capacitors made with Meng's manganese dioxide nanorods offer the best of both worlds: they hold more energy, like a battery, plus they yield even more power than a comparable carbon-based physical capacitor.

His team was able to grow a nanoforest of manganese dioxide nanorods using electrophoretic deposition, a technique in which small particles are deposited on a substrate under the influence of an electric field. The process is not especially difficult. "We did it in a lab, but this is scalable manufacturing," he says. "We can continuously print it out in a roll-to-roll manner, and you can make the substrate very large if you like."

Capacitors made with manganese dioxide nanorods could help hybrid and electric vehicles accelerate more quickly or could be coupled with solar cells. "The process also opens the door for many other applications, not just supercapacitors," says Meng.

####

About Michigan Technological University
Michigan Technological University (www.mtu.edu) is a leading public research university developing new technologies and preparing students to create the future for a prosperous and sustainable world. Michigan Tech offers more than 130 undergraduate and graduate degree programs in engineering; forest resources; computing; technology; business; economics; natural, physical and environmental sciences; arts; humanities; and social sciences.

For more information, please click here

Contacts:
Marcia Goodrich

906-231-2551

Copyright © Michigan Technological University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Meng’s research is described in the article “Scalable High-Power Redox Capacitors with Aligned Nanoforests of Crystalline MnO2 Nanorods by High-Voltage Electrophoretic Deposition” (http://pubs.acs.org/doi/abs/10.1021/nn3044462), which was published online Feb. 1 in ACS Nano:

Related News Press

News and information

Scientists find a way of acquiring graphene-like films from salts to boost nanoelectronics: Physicists use supercomputers to find a way of making 'imitation graphene' from salt July 30th, 2016

Vortex laser offers hope for Moore's Law: The optics advancement may solve an approaching data bottleneck by helping to boost computing power and information transfer rates tenfold July 30th, 2016

New method for making green LEDs enhances their efficiency and brightness July 30th, 2016

A new type of quantum bits July 29th, 2016

Discoveries

Scientists find a way of acquiring graphene-like films from salts to boost nanoelectronics: Physicists use supercomputers to find a way of making 'imitation graphene' from salt July 30th, 2016

Vortex laser offers hope for Moore's Law: The optics advancement may solve an approaching data bottleneck by helping to boost computing power and information transfer rates tenfold July 30th, 2016

New method for making green LEDs enhances their efficiency and brightness July 30th, 2016

A new type of quantum bits July 29th, 2016

Announcements

Scientists find a way of acquiring graphene-like films from salts to boost nanoelectronics: Physicists use supercomputers to find a way of making 'imitation graphene' from salt July 30th, 2016

Vortex laser offers hope for Moore's Law: The optics advancement may solve an approaching data bottleneck by helping to boost computing power and information transfer rates tenfold July 30th, 2016

New method for making green LEDs enhances their efficiency and brightness July 30th, 2016

A new type of quantum bits July 29th, 2016

Energy

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Designing climate-friendly concrete, from the nanoscale up: New understanding of concrete’s properties could increase lifetime of the building material, decrease emissions July 25th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Researchers discover key mechanism for producing solar cells: Better understanding of perovskite solar cells could boost widespread use July 21st, 2016

Automotive/Transportation

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Researchers improve catalyst efficiency for clean industries: Method reduces use of expensive platinum July 8th, 2016

Artificial synapse rivals biological ones in energy consumption June 21st, 2016

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Synthesized microporous 3-D graphene-like carbons: IBS research team create carbon synthesis using zeolites as a template July 1st, 2016

Solar/Photovoltaic

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Researchers discover key mechanism for producing solar cells: Better understanding of perovskite solar cells could boost widespread use July 21st, 2016

The future of perovskite solar cells has just got brighter -- come rain or shine: Korean researchers at POSTECH have succeeded in developing high-efficiency perovskite solar cells that retain excellent performance over two months in a very humid condition July 21st, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic