CoNi spheres were synthesized by a liquid phase reduction process. Typically, 0.01 mol of NiCl2·6H2O and 0.01 mol of CoCl2·6H2O were dissolved in 200 mL of EG under mechanical stirring at 85 °C, followed by the addition of 0.12 mol of NaOH. After 20 min, 8 mL of N2H4·H2O was added. The reaction duration is 1 h. The obtained products were washed for several times with distilled water and absolute ethanol. Finally, the products were dried in a vacuum oven at 60 °C overnight for further characterization.
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