Abstract：Ni-Co-O composites were prepared by a novel two-stage micro-impinging stream reactor (MISR) with NiSO₄·6H₂O and Co (NO₃) ₂·6H₂O as raw materials and ammonia as precipitant. The morphology, specific surface area and electrochemical performance of the composites were characterized by scanning electron microscopy (SEM) , surface area analyzer and cell testing systems. The results show that Ni-Co-O composites with a particle size of 50 nm and a large specific surface area are prepared by the two-stage MISR. At a constant current density of 1 A/g, the Ni-Co-O electrode have a maximum specific capacitance of about 2 700 F/g and almost 100%capacitance retention after 500 charge-discharge cycles.

Keywords：Ni-Co-O composites; capacitance materials; micr o-reactor; impinging stream