Graphene oxide induced high dielectricity in CS/PMMA solid polymer electrolytes and the enhanced specific capacitance with Ag decorated MnCoFeO4 nanoparticles anchored graphene sheets in hybrid solid-state supercapacitors

Enhanced specific capacitance with silver decorated manganese cobalt ferrite (MnCoFeO4) nanoparticles anchored onto graphene sheets as an electrode and graphene oxide (GO) grafted chitosan (CS)/ polymethyl methacrylate (PMMA) as solid electrolytes in hybrid solid-state supercapacitors has been reported here. GO doped CS/PMMA blended solid electrolytes exhibit high ionic conductivity (-4.5 x 10-3 S/cm) and dielectric constant (-4018) at room temperature. Thermal analysis suggests a significant reduction in crystallinity in GO grafted CS/PMMA electrolytes. The scaling of the ac conductivity and dielectric constant suggests that the relaxation phenomenon is independent of the CS/PMMA blending compositions but dependent on the GO doping. The interaction between Li+cation and the amide functional group is weakened remarkably on grafting the electrolytes with GO. An effective specific capacitance of-294 Fg 1 is obtained with Ag decorated MnCoFeO4 nanoparticles anchored onto rGO electrode which is-2.5 times enhanced compared to that with MnCoFeO4 electrode.

Automated summary

In this study, enhanced specific capacitance was achieved by using silver decorated manganese cobalt ferrite nanoparticles anchored onto graphene sheets as an electrode and graphene oxide grafted chitosan/polymethyl methacrylate as solid electrolytes in hybrid solid-state supercapacitors. The GO doped chitosan/polymethyl methacrylate electrolytes exhibited high ionic conductivity and dielectric constant at room temperature. The interaction between Li+ cation and the amide functional group was weakened remarkably on grafting the electrolytes with GO. The effective specific capacitance was significantly improved when using Ag decorated MnCoFeO4 nanoparticles anchored onto reduced graphene oxide electrode.