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Abstract
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Zinc nitroprusside (ZnNP) nanoparticles were
fabricated at the surface of zinc powder-doped carbon
ceramic electrode (CCE) by a chemical derivatization process.
This modified electrode was characterized by scanning
electron microscopy, atomic force microscopy and
cyclic voltammetry techniques. The charge transfer rate
constant (ks) and charge transfer coefficient (α) were calculated
for the electron exchange reaction of the ZnNP thin
film. The ZnNP nanoparticle-modified CCE (ZnNP|CCE)
showed good electrocatalytic activity toward hydrazine
oxidation. The limit of detection (S/N = 3) and sensitivity
were found to be 0.16 μM and 0.21 μA/μM, respectively.
The mechanism of hydrazine electrooxidation at the electrode
surface was studied. Finally, the ZnNP|CCE was
successfully used for the determination of trace amount of
hydrazine in different spiked and real samples.
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