Fe3O4@N-porous carbon nano rice/rGO sheet as positive electrode material for a high performance supercapattery

Abstract Fe3O4 particles are designed to originate reversible faradaic process and carbon material with a rice-like shape and meso-pore dominated structure is designed to encapsulate the Fe3O4 particles. Synthesized carbon nano rice wrapped Fe3O4 are uniformly anchored on the surface of reduced graphene oxide (rGO) nano sheets in a one-pot facile hydrothermal procedure. A significant amount (13.28 at%) of N is also doped into the carbon nano rice in the hydrothermal process, simultaneously. The synthesized Fe3O4@N-Carbon nano rice/rGO (Fe3O4@N-PCNR/rGO) delivers a high capacity of 495 Cg-1at a current density of 1 Ag-1 and high long-term stability of 70% after 1000 charge-discharge cycles at 10 Ag-1. The Fe3O4@N-Carbon/rGO is utilized as a positive electrode, and synthesized 3D rGO aerogel is employed as a negative electrode to fabricate a supercapattery, which exhibits a wide operating potential window of 1.5 V, a high energy density of 46 W h kg-1 at 750 W kg-1, and even 10 W h kg-1 at an elevated power density of 7500 W kg-1. The supercapattery also performs well in terms of long-life stability with 80% of capacitance retention after 10,000 charge-discharge cycles at 10 Ag-1.