Abstract
The development of effective and accurate gallic acid (GA) electrochemical sensors is critical for food and pharmaceutical industry and health perspectives. Multi-step hydrothermal treatments of bimetallic (Ni/Co) flaky bimetallic hydroxides (NiCo FBHs) were employed to prepare tungsten-doped cobalt-nickel selenides nanosheets arrays (W-Co0.5Ni0.5Se2 NSAs) serving as the main active substance of GA detection. The morphology and composition of the W-Co0.5Ni0.5Se2 NSAs/NF were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The GA electrochemical sensor constructed by the W-Co0.5Ni0.5Se2 NSAs/NF composite electrode exhibits two linearconcentration ranges of 1.00-36.2 μM and 36.2-1.00×103 μM for GA electrochemical detection with a limit of detectionof 0.120 μM (S/N=3) at the working potential of 0.05 V (vs. SCE). TheW-Co0.5Ni0.5Se2 NSAs/NF showshigh selectivity, goodlong-term stability, high recovery in the range 97.9-105%, and arelative standard deviation (RSD) between 0.60 and 2.7%.
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