Electrochemical Determination of Dopamine Based on Metal-Substituted Polyoxometalates Composites

Authors

Yi-fei XING, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
Na LI, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
Xiao-fang WEN, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
Hong-yan HAN, 2. Department of Construction Engineering, Hebei College of Industry and Technology, Shijiazhuang 050091, Hebei, China;
Min CUI, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
Cong ZHANG, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
Ju-jie REN, 1. Department of Chemistry, School of Science , Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;Follow
Xue-ping JI, 3. School of Pharmacy,Hebei Medical University, Shijiazhuang 050017, Hebei, China;Follow

Corresponding Author

Ju-jie REN(jujieren@163.com);
Xue-ping JI(xuepingji@126.com)

Abstract

In this report, a dopamine electrochemical sensor based on metal-substituted polyoxometalates and reduced graphene oxide (RGO) composite was successfully constructed. The K₂H₂SiW₁₁NiO₃₉·xH₂O (SiW₁₁Ni) was synthesized by hydrothermal method, while the RGO was prepared by Hummers' method and chemical reduction method. The above-mentioned materials were characterized by SEM, FTIR and XRD. The as-synthesized SiW₁₁Ni and RGO composites were modified on the surface of glassy carbon electrode (GCE) by drop coating method, and the sensing interface (SiW₁₁Ni-RGO/GCE) was successfully constructed. The electrochemical properties of the sensing interface were studied by electrochemical impedance spectroscopy and cyclic voltammetry. After optimizing the experimental conditions, dopamine could be quantitatively detected by cyclic voltammetry with good performance. The limit of detection was 3.2 μmol·L ^-1 (S/N = 3), the sensitivity was 9.71 μA·(μmol·L ^-1·cm ^-2) ^-1, and the linear range was 10 to 80 μmol·L ^-1.

Graphical Abstract

Keywords

dopamine, electrochemical sensor, polyoxometalates, reduced graphene oxide, cyclic voltammetry

DOI Link

https://doi.org/10.13208/j.electrochem.190716

Publication Date

2020-12-28

Online Available Date

2019-12-16

Revised Date

2019-12-13

Received Date

2019-07-16

Recommended Citation

Yi-fei XING, Na LI, Xiao-fang WEN, Hong-yan HAN, Min CUI, Cong ZHANG, Ju-jie REN, Xue-ping JI. Electrochemical Determination of Dopamine Based on Metal-Substituted Polyoxometalates Composites[J]. Journal of Electrochemistry, 2020 , 26(6): 890-899.
DOI: 10.13208/j.electrochem.190716
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss6/12