The Design of Cobalt (II)-Porphyrin/Fe2O3-Reduced Graphene Oxide Nanohybrid for Enhanced Electrochemical Sensing of 4-Hydroxybenzoic Acid

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This study presents the synthesis and characterization of a novel electrocatalyst based on cobalt (II)-tetra aminophenyl porphyrin (CoTAPor) conjugated non-covalently with an iron (III) oxide-reduced graphene oxide (Fe2O3rGO). The synthesized materials were then used to modify a glassy carbon electrode (GCE), with CoTAPor-Fe2O3rGO identified as the superior electrocatalyst. The electrochemical detection of 4-hydroxybenzoic acid (pHBA) was performed on the CoTAPor- Fe2O3rGO-modified GCE using cyclic voltammetry (CV) and chronoamperometry (CA). The CoTAPor-Fe2O3rGO composite exhibited the best catalytic performance, showing a significantly higher current response compared to bare GCE, CoTAPor, and Fe2O3rGO individually under CV and CA. This enhanced performance is attributed to the synergistic interactions between CoTAPor and Fe2O3rGO, resulting in increased sensitivity and a lower limit of detection (LoD). For CoTAPor-Fe2O3rGO, the sensitivity was 0.761 µA µM−1, with a LoD of 1.18 µM (S/N = 3). In addition, the electrocatalyst demonstrated good selectivity for pHBA in the presence of potentially interfering substances under controlled experimental conditions.Graphical