High Specific Capacitance and Energy density of Synthesized Graphene Oxide based Hierarchical Al2S3 Nanorambutan for Supercapacitor Applications

Abstract The fabrication of nano-network structures for enhancing specific surface area and electrical conductivity is very crucial to attain high specific capacitance and energy density, which are important parameters to investigate a material for supercapacitor applications. Graphene oxide (GO) supported Al 2 S 3 with hierarchical nanorambutan like morphology was fabricated by employing hydrothermal method. The determined high electrical conductivity, surface area, as well as the mechanical support offered by GO make the Al 2 S 3 nanorambutan electrochemically active. The CV curves with well-defined redox peaks confirm the pseudocapacitive behavior of GO based hierarchical Al 2 S 3 nanorambutan in 1 M NaOH electrolyte. The specific capacitance extracted from the CV curves is 1687.97 Fg −1 at the scan rate of 5 mVs −1 . Moreover, a good galvanostatic discharge time of 903 s and a huge specific capacitance of 2178.16 Fg −1 at the current density of 3 mA cm −2 have been observed. The energy density calculated from the galvanostatic discharge is 108.91 WhKg −1 at the current density of 3 mA cm −2 , while a power density of 978.92 WKg −1 is observed at the current density of 15 mA cm −2 . The electrochemical impedance also confirms the pseudocapacitive nature of Al 2 S 3 hierarchical nanorambutan electrode. The electrode stability test shows 57.84% retention of the specific capacitance up to 1000 cycles. The experimental results suggest that hierarchical Al 2 S 3 nanorambutan is suitable electrode material for supercapacitor applications.