A binder-free three-dimensional Ni foam supported hollow Co3O4/NiCo2O4 sensor for efficient monitoring of 4-chlorophenol
Materials Today Sustainability
School of Science
Edith Cowan University
Higher Education Commission (HEC), Pakistan
Nanostructured transition metal oxides with fine morphological tuning are considered excellent electrode materials for manufacturing electrochemical sensors. To explore a novel functional electroactive material having higher sensitivity and stability with a low limit of detection in a wider linear range and reliable selectivity for 4-chlorophenol (4-CP) monitoring in aqueous media, zeolitic imidazolate framework-67-derived hollow porous Co3O4/NiCo2O4 bimetallic nanostructure on Ni foam was assembled successfully via a simple and facile method. The optimized nano architectural Co3O4/NiCo2O4@NF electrode showed remarkable results in terms of sensitivity (0.47 μA μM−1 cm−2), ultra-low detection limit (0.08) in a wider linear range (0.3–133 μM), and excellent performance in complex environment for reliable 4-CP monitoring with the application of an appropriate applied potential. The prepared sensor has not only tremendous durability (∼35 days) and reproducibility but also a great capability to detect 4-CP in real-water environment. The applied sensor showed superior electroconductivity, abundant active sites on the larger surface area, efficient electron transfer because of the availability of numerous short pathways for ion diffusion owing to the hollow porous structure. This works offers not only a rationally designed electrode by bimetallic oxides for excellent monitoring of 4-CP but also promising electrode materials for the detection of other pollutants.