Construction of Hierarchical CuCo2O4-Ni(OH)2 Core-Shell Nanowire Arrays for High-Performance Pseudocapacitor.

The hierarchical CuCo₂O₄-Ni(OH)₂ core-shell nanowire arrays on Ni foam were fabricated using facile and cost-effective two-step hydrothermal synthesis. The growth of CuCo₂O₄ nanowires was developed on Ni foam as the apposite basis of the conductive scaffold, and the ultrathin Ni(OH)2 nanowires were subsequently immobilized to form CuCo₂O₄-Ni(OH)₂ core-shell nanowire arrays (NWAs). The prepared materials were further characterized in structural, morphological, and electrochemical properties. The obtained CuCo₂O₄-Ni(OH)₂ pseudocapacitor electrode, incorporated by unique core-shell heterostructures nanowire arrays, exhibited great specific capacitance of 1201.67 F g^-1 at 1 mA g^-1, which is much higher than pristine CuCo₂O₄ nanowire of 638.89 F g^-1 at 1 mA g^-1. Simultaneously, it also has a high power density of 5.56 kW kg^-1 at an energy density of 73.33 Wh kg^-1 and good long-term cycling performance (~84 capacitance retention after 1000 cycles). The improved morphological and structural properties have substantiated the CuCo₂O₄- Ni(OH)₂ core-shell nanowire arrays properties owing to higher surface active area and richer redox activity for boosting the electrochemical properties. [ABSTRACT FROM AUTHOR]