Finger Number and Device Performance: A Case Study of Reduced Graphene Oxide Microsupercapacitors

Microsupercapacitors (MSCs) are recognized as suitable energy storage devices for the internet of things (IoTs) applications. Herein is described the work conducted to assess the areal energy and power densities of MSCs with 2, 10, 20, and 40 interdigital finger electrodes on a fixed device footprint area (the finger interspacing is fixed at 40 mu m, and the finger width and length are allowed to vary to fit the footprint area). The MSCs are based on reduced graphene oxide (rGO) materials and fabricated with a spin-coating and etch method. The performance evaluation indicates a strong dependency of areal capacitance and energy density on the number of fingers, and the maximum (impedance match) power density is also influenced to a relatively large extent, whereas the average power density is not sensitive to the configuration parameters in the present evaluation settings (scan rate 20-200 mV s(-1)and current density of 100 mu A cm(-2)). For the rGO-based devices, the equivalent distributed resistance may play an important role in determining the device resistance and power-related performance.

Automated summary

The study reveals a strong dependency of the performance of MSCs on the number of fingers, with the maximum power density being significantly affected. The average power density, however, is not sensitive to configuration parameters. For rGO-based devices, the equivalent distributed resistance may play a critical role in determining device resistance and power-related performance.