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. Amongst the extensive range of twodimensional materials utilized in energy storage, graphene is particularly noteworthy for its exceptional physicochemical properties. Graphene aerogels have great potential for supercapacitor application due to their porous structure and, as such, have been 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 graphene aerogels is proposed to issue this problem. Nanoporous graphene aerogel flowers with higher specific surface area were formed and the corresponding capacitance can be achieved to 264 F/g. After 5,000 cycles at the current density of 10 A/g, the measured electrode’s cycle efficiency was found to be 84.8%, 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