Back in May, Lomiko Metals, Stony Brook University (SBU) and Graphene Labs signed an agreement toinvestigate graphene based applications - mainly supercapacitors and batteries. Today the companies announced that they have reached a significant milestone by receiving a prototype graphene supercapacitor and a report from Stony Brook University and New York State’s Center for Advanced Sensor Technology (Sensor CAT).
The supercapacitor prototype was made using graphene composite material prepared using a proprietary technology developed at Graphene Labs. The measured specific capacitance of the prototype was found to be around 500 Farad per gram of the material. This value is comparable with the best values reported in the literature for a supercapacitor of this type.
Researchers from Korea's Gwangju Institute of Science and Technology in Korea developed high-performance supercapacitors based on graphene. They say these capacitors can store almost as much energy as a Li-Ion battery and can charge/discharge in seconds. They also last for many tens of thousands of charging cycles.
The researchers use a highly porous graphene that has a huge internal surface area. To fabricate this material they reduced graphene oxide with hydrazine in water agitated with ultrasound. This results in a graphene powder that they then packed into a cell shaped like a cell and dried it at 140 degrees Celsius under pressure for five hour. The material was used as an electrode.
New supercapacitor design uses silicon coated with graphene to achieve excellent performance and silicon integrability
Researches from Vanderbilt University developed a new graphene-coated silicon based supercapacitor. This is an attractive design not just because of its excellent properties, but because it can be integrated into silicon chips.
Silicon isn't normally used for supercapacitors due to the extreme reactivity of silicon with electrolytes. But doped Silicon has very attractive features such as a low mass density, excellent conductivity, a controllably etched nanoporous structure. In addition silicon is abundant and used in many processes which makes it easier to integrate.
The NSF awards $1.5 million towards a new roll-to-roll graphene nanopetals production process research
Researchers at Purdue University are developing a new graphene "nanopetals" mass production process. Those nanopetals are graphene-based vertical nanostructures that look like tiny rose petals, and they have applications in sensors, heat-management, supercapacitors and batteries. This research is funded with a $1.5 million grant from the NSF.
The researchers hope to increase the production speed of nanopetal-coated surfaces to 10 square meters per hour, using a roll-to-roll process. This is a dramatic increase to current "laboratory-scale" production rate. The new process will use a vacuum-based plasma-enhanced chemical vapor deposition (PECVD).
Back in May, Lomiko Metals, Stony Brook University (SBU) and Graphene Labs signed an agreement to investigate graphene based applications - mainly supercapacitors and batteries. Here's Lomiko Metals' CEO, Paul Gill explaining the company's graphite and graphene developments, especially regarding this project:
Graphene Labs recently managed to turn Lomiko Metals' graphite into Graphene Oxide, and then turn that GO into reduced-GO (r-GO). The supercapacitor research at SBU will be based on this r-GO material.
Researchers from the University of Texas and the University of Science and Technology of China developed a new graphene-like material (called VOPO4) that can be useful as a working electrode of flexible supercapacitors together with graphene.
VOPO4, which is less than 6 atoms, was developed by using a 2-2-propanol-assisted ultrasonic method to exfoliate bulk VOPO4·2H2O into VOPO4 nanosheets. The researchers created a hybrid graphene-VOPO4 sheet that achieves both high planar conductivity and better electrochemical performance compared to pure graphene.
Graphene Labs successfully managed to convert Lomiko Metal's Quatre Milles property graphite to graphene
Graphene Laboratories announced that they have successfully managed to convert Lomiko Metal's Quatre Milles property graphite to graphene. They have actually produced graphene oxide (GO) and reduced graphene oxide (RGO) samples. The companies hope that they will be able to create graphene materials on a larger scale and at a reduced price.
In the first step of the conversion process the natural graphite flakes were oxidized and turned into GO by modified Hummer's method. This resulted in a stable aqueous dispersion with concentration of 40 g/L. The GO was then converted into RGO, with a surface area of 500 m2 /g and an electrical conductivity 4 S/cm.