Researchers from George Washington University developed a carbon nanotube and graphene composite material based ultracapacitors that combines high performance with low cost. The specific capacitance of the device is three times higher compared to CNT-pure capacitors.
The researchers explain that the hybrid structure is useful because 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. In addition, the production method is simple, scalable and low cost.
Veritcally-aligned graphene oxide flakes enable supercapacitors that can charge 1,000 faster than regular graphene ones
Researchers from Korea's Sungkyunkwan developed new supercapacitors that can charge 1000 times faster than current graphene supercapacitors, while also having three times the energy capacity. To achieve this fast charge (and discharge) times,t he researchers used vertically aligning graphene oxide flakes.
The researchers created a graphene oxide film using a carbon nanotube, and then used cutting and heat treatment to develop the vertically-structured graphene electrodes. The researchers also inserted a VNT into the GO sheets and created regular patterned pores in the GO films. All this resulting in electrodes that is much faster than solid and vertically-structured graphene used in existing supercapacitors.
Researchers from Japan and Korea suggest a new way to make graphene - from rice husk (agricultural "waste"). They say that this method may prove to be an easy, scalable and cheap way to produce graphene. As annual rice husk waste is about 120 million tons a year, it's potential for graphene feed material is large.
Activated carbon has been made for a long time from rice husk ash, but this is the first time that graphene structured have been observed in such rice husk-derived activated carbon. In addition, the researchers found that highly crystalline and atomically clean edges are present in the synthesized materials, even though the graphene sample was prepared at relatively a low temperature of 850°C. These findings suggest that the resulting graphene may find applications in energy storage and conversion devices.
Researchers from Australia and Ireland developed a flexible yarn made from graphene oxide. This strong, lightweight, highly conductive and high capacitance fiber may be a great material for wearable textiles.
The researchers report that the new yarns and fibers exhibit the best electrochemical capacitance ever - of as high as 410 F/g. To create the fiber, the researchers used a novel wet-spinning technique that can produce both GO and r-GO yarns of unlimited lengths. Those yarns are strong (with a Young’s modulus that is greater than 29 GPa), have a high electrical conductivity of around 2500 S/m and a very large surface area – about 2600 m2/g for graphene oxide and 2210 m2/g for the reduced material.
Last month Cientifica signed an exclusivity agreement with London Graphene to develop technology using graphene for energy storage. Today Cientifica announced that London Graphene signed an option agreement with ISIS Innovation (the technology transfer office for the University of Oxford) to license a patent filed by Isis Innovation.
This patent application details a 2D nanomaterial CVD-based production process that can be used to make high quality graphene on copper foil. This patent will be used in the company's energy storage project, and in fact the option is exclusive to the fields of capacitors and batteries.
Yole Developpement released a new graphene market report, in which they forecast that in 2024 the graphene material market will reach $141 million, driven mainly by transparent conductive electrodes and energy storage applications.
According to Yole, the market in 2013 was about $11 million, and it will grow slowly till 2017. In 2019 the market will experience faster growth (35.7% CAGR).
Angstron Materials (owned by Nanotek Instruments and based in Ohio, USA) is a graphene nanoplatelets (GNPs) and single-layer graphene sheets developer and producer.
Ian Fuller, the company's marketing and business development chief, was kind enough to answer a few questions we had regarding the company's technology and business. Ian joined Nanotek Instruments in 2006, focusing on fuel cells. He later joined the Angstron Materials team.