Electrocatalytic determination of hydrazine concentrations with polyelectrolyte supported AuCo nanoparticles on carbon electrodes

초록

Gold-cobalt alloy nanoparticles (AuCo NPs) deposited on a screen-printed carbon electrode (SPCE) surface modified with a combination of polystyrene sulfonate (PSS) and poly-3,4-ethylenedioxythiophene (PEDOT) is demonstrated for monitoring the direct oxidation of hydrazine. The surface morphology and properties of PSS: PEDOT supported AuCo NPs modified carbon electrodes were characterized using field-emission scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopic analysis. The current change with respect to the electrocatalytic oxidation of hydrazine on AuCo NPs/PSS:PEDOT/SPCE was used for the quanti-tative analysis in conjunction with cyclic, linear sweep, and differential pulse voltammetries alongside chro-noamperometry (CA). The voltammetric response for the oxidation of hydrazine using AuCo NPs/PSS:PEDOT/ SPCE was also compared with those of bare SPCE and PSS:PEDOT/SPCE. Under optimum conditions using CA, the modified electrode offered a linear range from 0.5 to 1000 mu M, a sensitivity of 1.64 mu A mu M-1 and a limit of detection of 0.17 mu M. The stability, reproducibility, sensitivity, and selectivity were also investigated. Finally, the AuCo NPs/PSS:PEDOT/SPCE platform was employed to determine native hydrazine concentrations in local river water samples.

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