Electrochemical Behavior of Three-Dimensional Cobalt Manganate with Flowerlike Structures for Effective Roxarsone Sensing

Thangavelu Kokulnathan; Veeramanikandan Rajagopal; Tzyy-Jiann Wang; Song-Jeng Huang; Faheem Ahmed

doi:10.1021/acs.inorgchem.1c02583

Electrochemical Behavior of Three-Dimensional Cobalt Manganate with Flowerlike Structures for Effective Roxarsone Sensing

Inorg Chem. 2021 Dec 6;60(23):17986-17996. doi: 10.1021/acs.inorgchem.1c02583. Epub 2021 Nov 8.

Authors

Thangavelu Kokulnathan¹, Veeramanikandan Rajagopal², Tzyy-Jiann Wang¹, Song-Jeng Huang², Faheem Ahmed³

Affiliations

¹ Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 106, Taiwan.
² Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
³ Department of Physics, College of Science, King Faisal University, P.O. Box 400, Hofuf, Al-Ahsa 31982, Kingdom of Saudi Arabia.

PMID: 34747616
DOI: 10.1021/acs.inorgchem.1c02583

Abstract

Rational design and construction of the finest electrocatalytic materials are important for improving the performance of electrochemical sensors. Spinel bioxides based on cobalt manganate (CoMn₂O₄) are of particular importance for electrochemical sensors due to their excellent catalytic performance. In this study, three-dimensional CoMn₂O₄ with the petal-free, flowerlike structure is synthesized by facile hydrothermal and calcination methods for the electrochemical sensing of roxarsone (RXS). The effect of calcination temperature on the characteristics of CoMn₂O₄ was thoroughly studied by in-depth electron microscopic, spectroscopic, and analytical methods. Compared to previous reports, CoMn₂O₄-modified screen-printed carbon electrodes display superior performance for the RXS detection, including a wide linear range (0.01-0.84 μM; 0.84-1130 μM), a low limit of detection (0.002 μM), and a high sensitivity (33.13 μA μM^-1 cm^-2). The remarkable electrocatalytic performance can be attributed to its excellent physical properties, such as good conductivity, hybrid architectures, high specific surface area, and rapid electron transportation. More significantly, the proposed electrochemical sensor presents excellent selectivity, good stability, and high reproducibility. Besides, the detection of RXS in river water samples using the CoMn₂O₄-based electrochemical sensor shows satisfactory recovery values in the range of 98.00-99.80%. This work opens a new strategy to design an electrocatalyst with the hybrid architecture for high-performance electrochemical sensing.