3. High energy density microsupercapacitors
In the field of miniaturized electrochemical energy storage devices, it is essential to significantly increase the amount of active material in microdevice electrodes while maintaining a footprint of a few mm 2 . To date, two strategies have been used to increase the areal energy density of microsupercapacitors without penalizing the device's areal footprint.
3.1 Use of thick electrodes
Firstly, one of the avenues currently pursued by many research groups is to increase the thickness of electrode material layers: cavities are created on or in a substrate using conventional microfabrication techniques, then filled with the
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High energy density microsupercapacitors
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