GO (0.5 g) was dispersed in H2O (150 mL) following 1.5 h of sonication while stirring. Next, Fe(NO3)3 (6.875 g) and Co(NO3)2 (2.475 g) were introduced, and the mixture’s pH was adjusted to 10. The reaction solution was moved to an autoclave and subjected to heating at 180 °C. After an 18 h reaction, it was cooled to room temperature. Then a water wash was performed with magnetic separation. Finally, the drying process was carried out.
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