Hierarchical FeCo₂O₄@polypyrrole Core/Shell Nanowires on Carbon Cloth for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors

Abstract

Fabrication and design of core/shell heterostructures electrodes are considered as a promising strategy to enhance the electrochemical property of the supercapacitors. In this study, we demonstrate the synthesis of the hierarchical hybrid FeCo2O4@polypyrrole core/shell nanowires via a chemical liquid process. As anode for a flexible supercapacitor, the FeCo2O4@polypyrrole core/shell nanowires display a specific capacitance of 2269 F g–1 at 1 A g–1. The specific capacitance retains 79.2% at 20 A g–1. Additionally, a flexible ASC was fabricated via combining an FeCo2O4@polypyrrole anode with an activated carbon cathode, which achieves an encouraging energy density of 68.8 Wh kg–1 (0.8 kW kg–1), and long cycle lifespan (91% over 5000 cycles). Moreover, an LED can be lighted efficiently with three devices in series. The FeCo2O4@polypyrrole core/shell nanowires electrode presents considerable potential for electrochemical energy storage.