Tailored manganese hexacyanoferrate/graphene oxide nanocomposites: one-pot facile synthesis and favorable capacitance behavior for supercapacitors

Prussian blue analogues have been widely investigated in the field of materials chemistry because of its low cost, high porosity, and excellent redox reversibility. Herein, a series of MnHCF/GO nanocomposites (MHG) with diverse GO contents have been successfully prepared at room temperature through a facile and cost-effective chemical precipitation method. It is indicated that MnHCF nanoparticles anchor on the surface of GO nanosheets, forming a well-coupled hybrid nanostructure. GO nanosheets can not only ameliorate the agglomeration of MnHCF nanoparticles, but also boost the electron/ion transport in the electrolyte. In addition, the synergistic effect between MnHCF nanoparticles and GO nanosheets can improve the electrochemical properties of MHG nanocomposites. MHG-3-based electrode with 20 wt% GO nanosheets exhibits a specific capacitance of 279.3 F g⁻¹, which is approximately three times higher than that of pristine MnHCF electrode at 0.3 A g⁻¹. Moreover, MHG-3-based electrode exhibits favorable cyclic stability (65.3% after 2000 continuous charge/discharge cycles at 0.8 A g⁻¹).