An Economical Electrode Material Enabling Stable and Selective Nonenzymatic Urea Sensing

The detection of urea is a significant concern across various sectors, including medical, environmental, and agricultural fields. Here, we developed a highly efficient and cost‐effective activated carbon (AC)‐nickel oxide (NiO) composite electrode material for urea sensing applications through the coprecipitation method. The material characteristics of prepared composite materials were evaluated using physicochemical characterization techniques. The suitability of the AC‐NiO composite for urea sensing was validated by performing cyclic voltammetry analysis at various scan rates for different concentrations of urea. The lowest limit of detection was found to be 1.69 μM, which is significant compared to previous studies. Furthermore, the system exhibited a high sensitivity of 1620 μA mM −1 cm −2 , indicating accurate and reliable measurements. These remarkable values suggest the potential of the AC‐NiO composite material for urea sensing applications. Furthermore, the common challenges faced by non‐enzymatic electrochemical sensors, such as selectivity, repeatability, reproducibility, and their application in real‐life samples, have also been investigated. The AC‐NiO composite‐based electrode demonstrates exceptional performance and can effectively address these challenges. This study suggests that the AC‐NiO composite is a cost‐effective and efficient sensing material, making it a promising candidate for future sensor technologies.