All solid state, high performance supercapacitor using Zinc Manganite embedded Graphene nanoribbons - Journal of Materials Chemistry A (RSC Publishing)
abrication of flexible supercapacitors involves challenging task of preparing flexible electrodes with large capacitance and robust mechanical strength. In this work, we demonstrate the formulation of high performance all solid state, flexible supercapacitor by using zinc manganite embedded graphene nanoribbons (ZnMn2O4/GNR) as electrode and gel polymer membrane as electrolyte. In situ availability of graphene oxide nanoribbon (GONR), leads to uniform dispersion of ZnMn2O4 nanosphere (~7 nm) that consequently result in enhanced electrolyte ions transport. Fabricated supercapacitor, ZnMn2O4/GNR//ZnMn2O4/GNR has been optimized with maximum 2.7 V operating cell potential. It delivers energy density ~ 40Wh Kg-1 and power density ~30 kW kg-1 at 1 Ag-1 with good cycling stability over 4000 cycles. High diffusion coefficient and short relaxation time 0.34 μs (at 75 oC) are indication of its high performance and stability at elevated temperature. The superior flexibility and durability of the supercapacitor cell are evident of their performance stability over consecutive GCD cycles under harsh conditions
