Synthesis of Keggin Polyoxometalates Modified Carbon Paste Electrode as A Sensor for Dopamine Detection

Authors

Peng-fei DONG, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
Na LI, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
Hai-yan ZHAO, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
Min CUI, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
Cong ZHANG, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
Ju-jie REN, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;Follow
Xue-ping JI, College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;Follow

Corresponding Author

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

Abstract

Polyoxometalates, a class of anionic clusters with structure diversity and size variability, make them very attractive in many fields such as electrochemistry, catalysis and medicine. The Co(C₁₅N₆H₁₂)₂[PW₁₂O₃₈]·5H₂O（Co[PW₁₂O₃₈]） modified carbon paste electrode was prepared in this work, and its electrochemical performances as the sensor for dopamine detection were characterized with electrochemical impedance spectroscopy, cyclic voltammetry and differential pulse voltammetry. The preparation conditions and test conditions were optimized respectively. Under the optimized conditions, the POMs modified carbon paste electrode exhibited good selectivity and sensitivity in dopamine detection. The linear response range was from 8.0 × 10^-6 mol·L^-1 to 3 × 10^-5 mol·L^-1, and the sensitivity was 0.039 μA·(μmol·L^-1)^-1 with the detection limit of 5.4 × 10^-6 mol·L^-1 (S/N=3). The POMs modified carbon paste electrode used for the dopamine sensing showed good stability, repeatability and anti-interference under the coexistence of ascorbic acid, uric acid and so on. The preparation process was simple, convenient, and low cost, and the electrode obtained had good sensing performance, thus, the present POMs modified electrode demonstrated a promising application for the detection of dopamine.

Graphical Abstract

Keywords

polyoxometalates, dopamine, electrochemical sensors, carbon paste electrode, cyclic voltammetry

DOI Link

https://doi.org/10.13208/j.electrochem.180405

Publication Date

2018-10-28

Online Available Date

2018-06-04

Revised Date

2018-05-14

Received Date

2018-04-05

Recommended Citation

Peng-fei DONG, Na LI, Hai-yan ZHAO, Min CUI, Cong ZHANG, Ju-jie REN, Xue-ping JI. Synthesis of Keggin Polyoxometalates Modified Carbon Paste Electrode as A Sensor for Dopamine Detection[J]. Journal of Electrochemistry, 2018 , 24(5): 555-562.
DOI: 10.13208/j.electrochem.180405
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss5/13