Abstract
Chemically synthesized cobalt-doped cerium oxide nanoparticles (CeO
2
: Co NPs) were successfully prepared by complexed based co-precipitation process. The structural, morphological, chemical composition, optical properties, and electrocatalytic properties were determined by X-ray diffraction pattern (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), UV/visible absorption spectroscopy, and cyclic voltammetry techniques. Owing to the wide-spread applications of CeO
2
NPs in various fields of applied material sciences, transition metal ion-doped CeO
2
: Co NPs exhibited excellent electrocatalytic properties. Outstanding physiochemical properties of CeO
2
, such as reversible oxidation states, high ionic mobility, large oxygen storage ability, effective large specific surface area, and the excellent current response, were observed in the electrocatalytic oxidation of hydrazine. The presence of transition metal ions (cobalt) improves the oxidation potential of hydrazine. Cyclic voltammetry was analog with the electrochemical impedance spectroscopy results, which revealed the enhanced with rapid sensing response against hydrazine. The electrocatalytic results of the CeO
2
: Co NPs electrode exhibited excellent voltammetry and impedance spectroscopy performance towards the hydrazine oxidation. The fabricated chemical sensor shows a wide linear detection range from 7.18 to 1000 µM, a low detection limit 7.2 µM, and sensitivity of 2.42 µAmLµM
−1
cm
−2
. The fabricated sensing electrode demonstrated long-term steadiness, resulting in high sensitivity, selectivity, repeatability/reproducibility, and rapid detection of hydrazine.