One-pot hydrothermal synthesis of MgV2O5-NC porous composite for hybrid supercapacitors with enhanced storage properties

Abstract

A facile and scalable method is reported for MgV 2 O 5 (MVO) interconnected with a porous nitrogen-doped carbon (NC) sphere network using a hydrothermal technique. The synthesized MgV 2 O 5 -N-doped Carbon (MVO-NC) nanocomposite has an orthorhombic crystal plane and a sheet-like MVO with a porous NC network based on structural and morphological analyses. In an aqueous electrolyte, the hydrothermally produced MVO-NC electrode demonstrates good charge–discharge performance, with an exceptional cycling retention of 97.05% over 5000 cycles. At 2 A g −1 , the MVO-NC has a higher specific capacitance of 358 F g −1 than other MVO electrode compositions (272 F g −1 ) and V 2 O 5 (146 F g −1 ). Owing to the highly redox-active MVO-NC composite and exceptionally porous activated carbon components, the hybrid supercapacitors achieve a maximum energy density of 38 W h kg −1 and maximum power density of 8000 W kg −1 . The two-dimensional porous network structure of the MVO, along with the porous NC, creates sufficient interstitial space for electrolyte accommodation, thereby allowing a rapid and reversible electrochemical process. • A simple and scalable synthesis of MVO-NC composite has been prepared by hydrothermal technique. • The MVO-NC composite provides the higher conductivity than the MVO and VO materials. • At 2 A g −1 , the MVO-NC has a higher specific capacitance of 358 F g −1 than MVO and VO. • The MVO-NC composite shows the high energy and power density in hybrid supercapacitors.