• DHARMENDRA KUMAR YADAV

      Articles written in Bulletin of Materials Science

    • Amperometric assay of hydrazine utilizing electro-deposited cobalt hexacyanoferrate nanocrystals on graphene oxide sheets

      MAMTA YADAV VELLAICHAMY GANESAN RUPALI GUPTA DHARMENDRA KUMAR YADAV PIYUSH KUMAR SONKAR

      More Details Abstract Fulltext PDF

      In-situ electrochemical deposition of cobalt hexacyanoferrate (CoHCF) on graphene oxide (GO) and its application for the electrocatalytic hydrazine determination in real samples are described in this research study. Co$^{2+}$ is immobilized on GO and the resulting material, GO-Co$^{2+}$ is coated on the surface of glassy carbon (GC) electrode. The fabricated electrode (GC/GO-Co$^{2+}$) is subjected to a continuous potential cycling in the range of 0.0–1.0 V which results in the formation of a thin CoHCF film on the surface of GO coated on the GC electrode (abbreviated as GC/GO-CoHCF). The synthesized GO-CoHCF composite material is characterized by Fourier transform infrared and scanning electron microscopy. GC/GO-CoHCF electrode electrocatalytically oxidizes hydrazine at low overpotential (0.63 V) and thisphenomenon is subsequently utilized for the sensitive determination of hydrazine in aqueous solutions. It exhibits a wide linear calibration range (0.1–400 $\mu$M), high sensitivity (0.93 $\mu$A $\mu$M$^{-1}$ cm$^{-2}$) and low limit of detection (17.5 nM) for the determination of hydrazine. Further, this electrode is employed for hydrazine determination in real samples.

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