Porous Fe₂O₃ Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors.

ABSTRACT: In this study, a novel negative electrode material was prepared by aligning ?-Fe₂O₃ nanorods on a hierarchical porous carbon (HPC) skeleton. The skeleton was derived from wheat flour by a facile hydrothermal route to enhance conductivity, improve surface properties, and achieve substantially good electrochemical performances. The ?-Fe₂O₃/HPC electrode exhibits enhanced specific capacitance of 706 F g^-1, which is twice higher than that of ?-Fe₂O₃. The advanced ?-Fe₂O₃/HPC//PANI/HPC asymmetrical supercapacitor was built with an expanded voltage of 2.0 V in 1 M Li₂SO₄, possessing a specific capacitance of 212 F g^-1 at 1 A g^-1 and a maximum energy density of 117 Wh kg^-1 at 1.0 kW kg^-1, along with an excellent stability of 5.8% decay in capacitance after 5,000 cycles. This study affords a simple process to develop asymmetric supercapacitors, which exhibit high electrochemical performances and are applicable in next-generation energy storage devices, based on ?-Fe₂O₃ hybrid materials.

SUBMITTER: Yu P 

PROVIDER: S-EPMC7726331 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature