AUTHOR=Yu Pingping , Duan Wei , Jiang Yanfeng 

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

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.611852

DOI=10.3389/fchem.2020.611852

ISSN=2296-2646

ABSTRACT=<p>In this study, a novel negative electrode material was prepared by aligning α-Fe<sub>2</sub>O<sub>3</sub> 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 α-Fe<sub>2</sub>O<sub>3</sub>/HPC electrode exhibits enhanced specific capacitance of 706 F g<sup>−1</sup>, which is twice higher than that of α-Fe<sub>2</sub>O<sub>3</sub>. The advanced α-Fe<sub>2</sub>O<sub>3</sub>/HPC//PANI/HPC asymmetrical supercapacitor was built with an expanded voltage of 2.0 V in 1 M Li<sub>2</sub>SO<sub>4</sub>, possessing a specific capacitance of 212 F g<sup>−1</sup> at 1 A g<sup>−1</sup> and a maximum energy density of 117 Wh kg<sup>−1</sup> at 1.0 kW kg<sup>−1</sup>, 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 α-Fe<sub>2</sub>O<sub>3</sub> hybrid materials.</p>