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September 24, 2010
Researchers in the US have created a new 'ultracapacitor' which is capable of charging and discharging in under 200 microseconds, it emerged this week.
John Miller and his colleagues from JME Inc and Case Western Reserve University in Cleveland, Ohio conducted tests on the electric double-layer capacitor.
They concluded that the device could be ideal for hybrid vehicles, computer processing units (CPUs) or other tiny integrated circuits.
Featuring nanometre-scale graphene electrodes, the ultracapacitor was found to operate efficiently at frequencies below approximately 0.05Hz.
However, it also works less effectively at higher frequencies as the electrodes are porous, which turns it more into a resistor than a capacitor.
"The bottom line is that these devices could lead to smaller higher-frequency capacitors for applications in low-voltage systems like CPUs and similar integrated circuits," said Mr Miller.
Further tests on the device are now planned, mainly focusing on how the graphene electrode material can be grown.
The results of the research can be viewed in the latest issue of the journal Science.
Rapid Electronics is a leading UK supplier of energy saving products, electronic components and electrical equipment.
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