Interconnected 3 D Network of Graphene‐Oxide Nanosheets Decorated with Carbon Dots for High‐Performance Supercapacitors

Abstract Interconnected 3 D nanosheet networks of reduced graphene oxide decorated with carbon dots (rGO/CDs) are successfully fabricated through a simple one‐pot hydrothermal process. The as‐prepared rGO/CDs present appropriate 3 D interconnectivity and abundant stable oxygen‐containing functional groups, to which we can attribute the excellent electrochemical performance such as high specific capacitance, good rate capability, and great cycling stability. Employed as binder‐free electrodes for supercapacitors, the resulting rGO/CDs exhibit excellent long‐term cycling stability (ca. 92 % capacitance retention after 20 000 charge/discharge cycles at current density of 10 A g −1 ) as well as a maximum specific capacitance of about 308 F g −1 at current density of 0.5 A g −1 , which is much higher than that of rGO (200 F g −1 ) and CDs (2.2 F g −1 ). This work provides a promising strategy to fabricate graphene‐based nanomaterials with greatly boosted electrochemical performances by decoration of with CDs.