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Hello! for my since-fiction i`m looking for answers for the following questions - is there any electrostatic properties about carbon tubes? Could it collect electrostatic energy?
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Graphene can hold an electrostatic charge
Drag,Originally posted by Drag View Post
Yes they can.
Another graphene application – supercapacitors
December 12, 2010
Another graphene application – supercapacitors
Graphene is carbon, literally a sheet of pure carbon one atom thick. It also has its atoms arranged in a honeycomb (hexagon) pattern. That pattern contributes to the many usual electrical properties of graphene. In the case of ultracapacitors it increases the ability of graphene to hold an electrostatic charge. However, there was a problem with using graphene – the sheets of graphene tend to ‘pile up’ one on top of the other, which severely limits the surface area where ions can collect.
Researchers at Nanotek Instruments (Dayton, Ohio, USA) dealt with this problem by devising a process that, in effect, crumples the sheets of graphene so that the layers do not overlap. This greatly increases the surface area for ions to accumulate. The result, as reported in the journal Nano Letters [November 8, 2010 Graphene-Based Supercapacitor with an Ultrahigh Energy Density] is a supercapacitor that can store about 28 watt-hours per kilogram.
This seems low compared to the lithium-ion battery that can store over 120 watt-hours per kilogram. However, most batteries operate within 20-50% of their energy per kilogram. A supercapacitor with about 20% of the capacity of a lithium-ion battery that can recharge in minutes rather than hours and that can be recharged millions of times is competitive for certain kinds of applications.
Below is a breakthrough that shows the power of upgrading old technology (Edison Battery) with carbon nanotubes (Graphene):
Making Edison’s Batteries Charge 1000 Times Faster
Making Edison's Batteries Charge 1000 Times Faster
"In conventional electrodes, people randomly mix iron and nickel materials with conductive carbon... Instead, we grew nanocrystals of iron oxide onto graphene, and nanocrystals of nickel hydroxide onto carbon nanotubes."
Usually, Edison's battery takes hours to charge; the Stanford version takes minutes. In fact, it's 1000 times faster.
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