In this study, we have described the synthesis of oxygen-rich hierarchical porous graphene (O-PG) using focused solar radiation on nitric acid treated graphene oxide film. This nitric acid treatment for… Click to show full abstract
In this study, we have described the synthesis of oxygen-rich hierarchical porous graphene (O-PG) using focused solar radiation on nitric acid treated graphene oxide film. This nitric acid treatment for graphene oxide helps in generating micropores on the graphene sheets and introducing oxygen-containing functional groups when solar light is focused. This unique hierarchical porous structure along with high surface area and oxygenated functional groups makes O-PG as suitable electrode in energy storage and also for capacitive deionization. The as-prepared O-PG exhibits high specific capacitance of 354 F g–1 along with energy storage of 110.6 Wh kg–1 at 1 A g–1 current density. O-PG also delivers high specific capacity of 90 mAh g–1 as high-performance cathode in aqueous Al-ion battery with an exceptionally high cyclic stability up to 10 000 cycles of charging–discharging processes at high current density of 0.5 A g–1. In addition, the electrosorption studies of salt ions were done using capacitive deioniz...
               
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