Sethi, M.Bantawal, H.Shenoy, U.S.Bhat, D.K.2026-02-052019Journal of Alloys and Compounds, 2019, 799, , pp. 256-2669258388https://doi.org/10.1016/j.jallcom.2019.05.302https://idr.nitk.ac.in/handle/123456789/24423The successful application of porous graphene (PG) is hindered due to the lack of efficient and cost-effective method for its synthesis. Herein, we report a facile and eco-friendly method to produce PG through a low temperature solvothermal method. The structural and morphological characteristics of PG samples were investigated thoroughly. The as synthesized material is found to be a few layers thick (?4–6 layers) with a surface area of 420 m2 g?1 and consisting of hierarchical pores on the surface of the sheets. A high specific capacitance of 666 F g?1 was obtained at a scan rate of 5 mV s?1, apart from longer cyclic stability with 87% retention of initial capacitance value after 10000 cycles for the PG 28 sample. The fabricated supercapacitor displayed an energy density of 26.3 Wh kg?1 and power density of 6120 W kg?1. Density functional theory calculations were also carried out to qualitatively support the enhanced capacitance by providing theoretical insight from electronic structure and density of states of PG. These results open a new avenue for greener synthesis of high-quality PG using environmentally friendly solvents, without the use of toxic chemicals, for excellent supercapacitor performance. © 2019 Elsevier B.V.CapacitanceCost effectivenessElectronic structureEnvironmental protectionGrapheneSupercapacitorTemperatureCyclic stabilityEnvironmentally friendly solventsHigh specific capacitancesMorphological characteristicPorous grapheneSolvothermal methodSupercapacitor electrodesSurface areaDensity functional theory