Hierarchical CoFeO/NiFeO nanocomposites with enhanced electrochemical capacitive properties.

Hierarchical CoFeO/NiFeO nanocomposites are prepared via a facile hydrothermal method, in which CoFeO nanoparticles are coated by NiFeO nanoparticles to form a novel nanostructure. Comparing with the single component of either CoFeO electrodes or NiFeO electrodes, the as-prepared hierarchical CoFeO/NiFeO nanocomposites electrodes deliver a higher specific capacitance of 269 F g at a current density of 1 A g and exhibit capacity retention of 81% after 10000 charge-discharge cycles. The improved electrochemical performance demonstrates that hierarchical CoFeO/NiFeO nanocomposites are promising materials and provide a new idea for future generation supercapacitors. [ABSTRACT FROM AUTHOR]