Asymmetric supercapacitor based on nanostructured graphene foam

What is it about?

Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and acti- vated carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum energy density of 42 mWh cm 2 , a power density of 0.5 W cm 2 and 98% retention of its initial capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na2SO4 aqueous electrolyte.

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Why is it important?

The asymmetric device showed good capacitance, energy and power densities values operating within a potential window of 1.8 V and also exhibited excellent cycle life. The robust 3D nanoarchitecture of the porous material avoids disintegration decay and hence leads to improved performance of the device.