Ternary Fe3O4/reduced graphene oxide/phytic acid doped polyaniline hybrid based supercapacitive electrode with high capacitance retention and good cycling stability

Abstract

Pseudocapacitive electrodes with high rate retention and good cycling stability are highly desirable in constructing high-performance supercapacitors due to their rapid charge/discharge capacity and long service life, but they are still a challenge to realize. Herein, a ternary Fe₃O₄/reduced graphene oxide/phytic acid (PA)-doped polyaniline (F-RGO-p-PANI) hybrid has been prepared to address this challenge. Prompted by the multiple synergistic effects among RGO, Fe₃O₄, PA, and PANI, our F-RGO-p-PANI material exhibits a high specific capacitance (C_s) of 459.1 F g⁻¹ with a current density of 0.5 A g⁻¹. Interestingly, our supercapacitor displays both high capacitance retention (∼83.5%) under a broad current density range (from 0.25 to 20 A g⁻¹) and high cycling stability (∼80.8%) over 10 000 cycles under a high current density (20 A g⁻¹), better than previous results. Moreover, our supercapacitor also shows a high specific energy density of 58.1 W h kg⁻¹ with a power density of 0.5 kW kg⁻¹. These results imply that our ternary F-RGO-p-PANI holds tremendous potential in fabricating rapidly charged/discharged supercapacitors.