Rational construction of NiCo2O4@Fe2O3 core-shell nanowire arrays for high-performance supercapacitors

Fe2O3 electrode materials exhibit excellent electrochemical performance in electrochemical energy storage system. However, its poor electrical conductivity limits its future practical application. The binder-free NiCo2O4@Fe2O3 composites was reasonably designed and fabricated on carbon fiber paper with NiCo2O4 nanowires as conductive scaffold in the present investigation. The three-dimensional nanostructure of the porous Fe2O3 nanorods coated the NiCo2O4 nanowire arrays showed the fascinating electrochemical performance, including high specific capacitance of 262 mF/cm(2) at a current density of 1 mA/cm(2), and remarkable cycle stability with similar to 74.2% capacitance retention after 4000 cycles. The excellent pseudocapacitance performance of NiCo2O4@Fe2O3 composite materials is due to synergistic effect between NiCo2O4 and Fe2O3. The results of the present work show that NiCo2O4@Fe2O3 core-shell composite electrode is expected to exhibit excellent performance in the field of supercapacitors.

Automated summary

The NiCo2O4@Fe2O3 composite electrode, designed and fabricated in this study, exhibits high specific capacitance and cycle stability. This is attributed to the synergistic effect between NiCo2O4 and Fe2O3, demonstrating excellent pseudocapacitance performance.