Hydrazine Sensor Based on Co₃O₄/rGO/Carbon Cloth Electrochemical Electrode

Porous cobalt oxide (Co₃O₄) nanosheets, vertically aligned on reduced graphene oxide (rGO) modified 3D carbon cloth (CC), are synthesized by using a facile diffusion method at room temperature following a thermal annealing process (named as Co₃O₄/rGO/CC). Employed as freestanding electrochemical electrode, the detection behaviors of the Co₃O₄/rGO/CC toward hydrazine have been systematically investigated. It exhibits a high sensitivity (1306.7 μA mM⁻¹ cm⁻²), good stability, and excellent selectivity. The detection limit for hydrazine can reach to 0.141 × 10⁻⁶ M with a linear response range of 5–470 × 10⁻⁶ M. The outstanding sensing properties of the Co₃O₄/rGO/CC electrode can be attributed to the electrocatalytic activity of porous Co₃O₄ nanosheets, the good conductivity of carbon cloth, and the large surface area of the 3D structure. It presents potential applications in the field of environment protection, food analysis, medicine, and so on.