Hierarchical tungsten-doped bimetallic selenides nanosheets arrays/nickel foam composite electrode as efficient gallic acid electrochemical sensor.

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%.