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

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-02-28 DOI:10.1007/s12678-025-00944-8

Teboho Edwin Mpakanyane, Nnamdi Nwahara, Mbulelo Jokazi, Tebello Nyokong

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Abstract

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 Abstract

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用于增强4-羟基苯甲酸电化学传感的钴(II)-卟啉/ fe2o3 -还原氧化石墨烯纳米杂化材料的设计

本研究提出了一种基于钴(II)-四氨基苯基卟啉（CoTAPor）与铁（III）还原氧化石墨烯（Fe2O3rGO）非共价共轭的新型电催化剂的合成和表征。然后将合成的材料用于修饰玻碳电极（GCE），并将CoTAPor-Fe2O3rGO确定为优越的电催化剂。采用循环伏安法（CV）和计时电流法（CA）对CoTAPor- fe2o3rgo修饰的GCE进行了4-羟基苯甲酸（pHBA）的电化学检测。CoTAPor-Fe2O3rGO复合材料表现出最好的催化性能，在CV和CA条件下，其电流响应明显高于GCE、CoTAPor和Fe2O3rGO，这种增强的性能归因于CoTAPor和Fe2O3rGO之间的协同作用，从而提高了灵敏度和较低的检测限（LoD）。对于CoTAPor-Fe2O3rGO，灵敏度为0.761µAµM−1，LoD为1.18µM （S/N = 3）。此外，在所控制的实验条件下，电催化剂在潜在干扰物质存在下对pHBA表现出良好的选择性。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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