Solar‐Photoactivated Nanoporous Graphene Aerogel Flowers for High‐Performance Supercapacitors

Supercapacitors are gaining popularity as potential energy‐storage devices due to their efficiency and environmentally sustainable features. Among the extensive range of 2D materials utilized in energy storage, graphene is particularly noteworthy for its exceptional physicochemical properties. Graphene aerogels (GAs) have great potential for supercapacitor application due to their porous structure and, as such, are widely researched. However, enhancing the capacity performance with easy and low‐energy processes is still facing challenges. Here, a facile, low‐cost, and environmentally friendly photoactivation method on GAs is proposed to address this problem. Nanoporous GA flowers with higher specific surface area are formed and the corresponding capacitance can be achieved to 264 F g −1 . After 10 000 cycles at the current density of 10 A g −1 , the measured electrode's cycle efficiency is found to be 80.9%, further emphasizing its remarkable performance. The unparalleled performance confirms the reliability of this method as compared to traditional activation methods while being cost‐effective and environmentally friendly.