Work

CoFe-MOF nanoarray as flexible microelectrode for electrochemical detection of catechol in water samples

Year: 2024

Type: article

Abstract: A simple, selective, and straightforward enzyme-free electrochemical catechol sensor has been designed and developed using cobalt hexacyanoferrate metal organic framework (CoFe-MOF) nanoarray. The prepared CoFe-MOF nanoarray has been successfully grown over a carbon cloth (CC) to form CoFe-MOF /CC as a flexible microelectrode for the detection of catechol. The surface of the activated CC was covered uniformly with CoFe-MOF in the form of nanoarray and exhibited double-shelled cubic morphology. The electrochemical performance of the CoFe-MOF /CC nanoarray microelectrode showed a pair of well-defined redox peaks corresponding to the Fe4+/Fe3+ redox signal. Interestingly, the fabricated nanoarray microelectrode has displayed superior peak current at lower onset potential with high electrochemical response compared to unmodified K3FeCN over CC microelectrode and bare activated CC. Further, the developed CoFe-MOF/CC nanoarray microelectrode for the oxidation of catechol was examined with consecutive injections of catechol. A fast and noticeable improvement in oxidation peak current was observed, thus representing the excellent electrocatalytic oxidation of catechol at the modified nanoarray microelectrode. Besides, CoFe-MOF/CC microelectrode exhibits an excellent linear response over a concentration range from 0.005 to 2.8 mM with low detection limit (LOD) and high sensitivity as 0.002 µM (S/N = 3) and 205.99 µA/mM, respectively. Moreover, the developed nonenzymatic sensor showed outstanding stability, acceptable reproducibility, and repeatability, along with good interference ability. It was successfully determined that the quantification of catechol in spiked water samples.

Source: Heliyon

DOI: 10.1016/j.heliyon.2024.e39241