Rational construction of NiCo_2O_4@Fe_2O_3 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/cm² at a current density of 1 ?mA/cm², and remarkable cycle stability with ~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.