The synthesis of manganese cobaltate(MnCo2O4) with the hybrid three-dimensional architecture has been developed as an electrocatalyst for the electrochemical sensing of paraoxon-ethyl(PEL).The detailed physicochemical and structural characterization of MnCo2O4 is meticulously examined.The MnCo2O4-modified screen-printed carbon electrode(SPCE) exhibits good electrocatalytic activity for the reduction of PEL compared with the bare SPCE due to numerous unique properties.By profiting from these advantages,the proposed MnCo2O4/SPCE shows superior sensing performance toward the determination of PEL,including low cathodic peak potential(-0.64 V),wide detection range(0.015-435 μM),low limit of detection(0.002 μM),high detection sensitivity(2.30 μA μM~(-1) cm~(-2)),excellent selectivity,and good reproducibility.Notably,the electrochemical performance of the MnCo2O4-based electrocatalyst is superior to those previously reported in the literatures.The practical application of the MnCo2O4/SPCE is effectively assessed in the analysis of food and water samples with satisfied recoveries of 96.00-99.35%.The superior performance of the proposed MnCo2O4 electrocatalyst holds considerable potential for future development of electrochemical sensing platforms.
Organophosphate pesticidesParaoxon-ethylInsecticideNerve agentsSolvothermal synthesisBinary metal oxidesElectroanalysisDifferential pulse voltammetry
Thangavelu Kokulnathan、Tzyy-Jiann Wang、Ying-Yu Wang
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Department of Electro-Optical Engineering,National Taipei University of Technology,Taipei 10608,Taiwan
NSTL
