Flexible hierarchical nanocomposites based on MnO2 nanowires/CoAl hydrotalcite/carbon fibers for high-performance supercapacitors

Abstract

A hierarchical nanocomposite based on MnO₂ nanowire/CoAl layered double hydroxide/carbon fibers is fabricated by a facile two-step method as a high-performance supercapacitor. The CoAl-LDH nanocrystals grown on flexible carbon fibers were prepared via an in situ hydrothermal method, followed by loading of MnO₂ nanowires through a direct redox reaction between the Co²⁺ species and MnO₄⁻. The hierarchical MnO₂/LDH/CFs electrode as a supercapacitor displays a high specific capacitance (944 F g⁻¹ at 1 A g⁻¹) and rate capability, good stability and excellent long-term cycling life.