Jasmin S. ShaikhNavajsharif S. ShaikhRohini KharadeSonali A. BeknalkarJyoti V. PatilMahesh P. SuryawanshiPongsakorn KanjanaboosChang Kook HongJin Hyeok KimPramod S. PatilUniversity of MumbaiShivaji UniversityMahidol UniversityChonnam National University2019-08-232019-08-232018-10-01Journal of Colloid and Interface Science. Vol.527, (2018), 40-4810957103002197972-s2.0-85047238124https://repository.li.mahidol.ac.th/handle/20.500.14594/45415© 2018 Symmetric supercapacitor is advanced over simple supercapacitor device due to their stability over a large potential window and high energy density. Graphene is a desired candidate for supercapacitor application since it has a high surface area, good electronic conductivity and high electro chemical stability. There is a pragmatic use of ionic liquid electrolyte for supercapacitor due to its stability over a large potential window, good ionic conductivity and eco-friendly nature. For high performance supercapacitor, the interaction between ionic liquid electrolyte and graphene are crucial for better charge transportation. In respect of this, a three-dimensional (3D) nanoporous honeycomb shaped sulfur embedded graphene (S-graphene) has been synthesized by simple chemical method. Here, the fabrication of high performance symmetric supercapacitor is done by using S-graphene as an electrode and [BMIM-PF6] as an electrolyte. The particular architecture of S-graphene benefited to reduce the ion diffusion resistance, providing the large surface area for charge transportation and efficient charge storage. The S-graphene and ionic liquid-based symmetric supercapacitor device showed the large potential window of 3.2 V with high energy density 124 Wh kg−1 at 0.2 A g−1 constant applied current density. Furthermore, this device shows good cycling performance (stability) with a capacitive retention of 95% over 20,000 cycles at a higher current density of 2 A g−1.Mahidol UniversityChemical EngineeringMaterials ScienceArticleSCOPUS10.1016/j.jcis.2018.05.022