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

• Published in: Materials research bulletin 2022-07, Vol.151, p.111814, Article 111814
• Main Authors: Majumdar, Simantini, Sen, Pintu, Ray, Ruma
• Format: Article
• Language: English
• Subjects: Chitosan; Graphene; Hybrid supercapacitor; Nanocomposite; Nanofiller; PMMA
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2022.111814

•A hybrid supercapacitor fabricated with Ag-MnCoFeO4@rGO electrode and GO grafted CS/PMMA SPNE.•Anomalous diffusion rate and dielectric constant enhanced with GO nanofiller.•Relaxation phenomenon is dependent on the GO doping compositions in the SPNE.•Melting temperature and crystallinity reduced in GO grafted solid electrolytes.•An effective specific capacitance of 294 Fg−1 attained with Ag-MnCoFeO4@rGO nanocomposite electrode. 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 × 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. [Display omitted]