Graphene supercapacitor breaks storage record

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Bericht 02-12-'10, 17:39

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Graphene supercapacitor breaks storage record

Graphene supercapacitor breaks storage record


Researchers in the US have made a graphene-based supercapacitor that can store as much energy per unit mass as nickel metal hydride batteries – but unlike batteries, it can be charged or discharged in just minutes or even seconds. The new device has a specific energy density of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C. These are the highest ever values for "electric double layer" supercapacitors based on carbon nanomaterials.


Supercapacitors, more accurately known as electric double-layer capacitors or electrochemical capacitors, can store much more charge than conventional capacitors. An important feature of supercapacitors is that there is an extremely narrow gap between the electrodes – which are ultrathin layers. This means that a large amount of electrical charge can be stored in a tiny volume.


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Lees verder: http://physicsworld.com/cws/article/news/44477


Bron: physicsworld.com
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