A flexible Ni-Ni(OH)(2)/carbon nanofiber (CNF) composite material was fabricated via electrospinning followed by a high-temperature carbonization and hydrothermal process. The Ni-Ni(OH)(2)/CNFs calcined at 800 degrees C exhibited excellent electrochemical performance, with high specific capacitance of 763 F g(-1)(1 A g(-1)). Moreover, the material showed good stability, with 94% capacitance retention after 8000 cycles. This work proves that Ni-Ni(OH)(2)/CNFs are a promising candidate for use as a high-efficiency supercapacitor electrode material.