Hypercapacitor based on Graphene Composites : 77.8 Wh/kg

hyper capacitor graphene composite

Graphene composite used for the creation of a hyper capacitor

Basically, a supercapacitor is composed of two electrodes, a porous membrane and an electrolyte. The energy and the power of supercapacitors depends particularly on the tension between the two electrodes in the electrolyte. However, the supercapacitors voltage reached 2.7 volts for acetonitrile based electrolytes which is unfortunately a toxic solvent and only 0.8 to 1 volt for aqueous electrolytes that are more environmentally friendly.

To improve performance and especially the density of energy stored by a supercapa, some researchers are therefore working on asymmetric super capacitors which two electrodes are made of different materials, which increases the tension.

A team of researchers led by Fan Zhuangjun Harbin Engineering University, Linjie Zhi at the National Center for Nanoscience and Fei Wei at Tsinghua University in China have created an asymmetric hypercapacitor based on a nickel hydroxide - graphene composite positive electrode and a porous graphene negative electrode.

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