Abstract
AbstractA novel nano‐ternary spinel oxides of Zn−Ni‐Co−O are synthesized via the coprecipitation method and used for detection towards Cu(II). The Zn doping effect on morphologies and microstructures of ZnxNi1‐xCo2O4 (x=0, 0.2, 0.4, 0.6, 0.8, 1.0) is systematically characterized and investigated. At the x of 0.4, the prepared Zn0.4Ni0.6Co2O4 modified electrode nanomaterials can realize electrochemical ultratrace detection of Cu(II), which shows the lowest detection limit of 1.96 nM with a linear range of 0.1 μM∼1.0 μM and the highest sensitivity of 15.2 μA/μM. Meanwhile, Zn0.4Ni0.6Co2O4 modified electrodes exhibit excellent repeatability (relative standard deviation (RSD) of 0.34 %), reproducibility (RSD of 0.3 %), stability (RSD of 3.0 %) as well as anti‐interference analysis, which has been successfully applied in the actual water environment. These results indicate that ZnxNi1‐xCo2O4 nanoparticles as a promising modified electrode materials for the electrochemical detection Cu(II).
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