Micro-nanoscale all-solid-state planar on-chip micro-supercapacitors based on nitrogen and oxygen Co-doped graphene quantum dots with excellent areal power and energy characteristics

Abstract

As a new quasi-zero-dimensional nanomaterial, graphene quantum dots (GQDs) can solve the impact of carbon materials that have low specific surface area and few active sites, improving the performance of planar on-chip micro-supercapacitors (POMSs) by reducing the interdigital width. In this article, nitrogen and oxygen co-doped GQDs (N-O-GQDs) as an electrode material and narrow electrode width and gap are both 6 μm make the POMS possess a power density of 28.1 μW cm⁻² and an energy density of 15.11 nWh cm⁻². Importantly, the capacitance retention rate is as high as 96.1% after 10,000 cycles of charging and discharging.