Oxygen Vacancy-Fe2O3@polyaniline Composites Directly Grown on Carbon Cloth as a High Stable Electrode for Symmetric Supercapacitors

Herein, we fabricated oxygen vacancy-Fe 2 O 3 @polyaniline (O-Fe 2 O 3 @PANI) composites directly grown on surface of carbon cloth via successively hydrothermal process, annealing process, chemical reduction, and in situ polymerization. Polyaniline (PANI) is fabricated in situ on oxygen vacancy-Fe 2 O 3 (O-Fe 2 O 3 ), and forms a porous PANI skeleton at the same time, thus forming a hierarchical structure of O-Fe 2 O 3 particles connected by conductive skeleton. The designed O-Fe 2 O 3 @PANI not only shows enhanced cycling stability (90% after 10,000 cycles at 10 A g −1 ), but also exhibits an improved specific capacitance (309 F g −1 at 0.5 A g −1 ). Furthermore, the symmetrical supercapacitor (SSC) assembled by O-Fe 2 O 3 @PANI presents high energy density of 12.125 Wh kg −1 at high power density of 250 W kg −1 and notable cycling life (100% retention over 10,000 cycles). The results demonstrate that the O-Fe 2 O 3 @PANI electrode is promising as electrode material for supercapacitors.