Magnetic-field-assisted preparation of one-dimensional (1-D) wire-like NiO/Co3O4 composite for improved specific capacitance and cycle ability

• Magnetic field was applied for the preparation of wire-like composite of NiO and Co3O4.
• This method provides possibility of the scalable production of 1-D wire-like NiO/Co3O4.
• 1-D Wire-like NiO/Co3O4 exhibits considerable capacitance and excellent cycle stability.

One dimensional (1-D) wire-like NiO/Co3O4 composites were facilely prepared through annealing 1-D Ni/Co alloys, which were fabricated by a simple magnetic field-assisted hydrothermal method. Galvanostatic charge and discharge measurements reveal that the 1-D NiO/Co3O4 composites exhibit excellent cycling stability. The specific capacitance still remains 221 F g−1 after 1500 cycles, which is nearly 1.5 times higher than that of the irregular NiO/Co3O4 spherical composite particles. And thus, this facile synthetic strategy could be useful to design high-performance electrodes for supercapacitors.

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