NICKEL NANOPARTICLES MODIFIED CARBON PASTE ELECTRODE FOR NI IONS DETERMINATION AND ITS THERMODYNAMICS STUDY

Sayyed Ahmad Nabavi - Amri, Tahereh Sadeghi, Mohammad Mahdi Norouzi

Abstract: Novel potentiometric electrodes were assembled with the carbon paste by nickel nanoparticles. Nickel nanoparticles were produced in acidic reducing solutions. Resulted product characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The properties of the modified electrodes at different concentrations were studied by electrochemical impedance spectroscopy (EIS) and potentiometry. Our results showed that Nickel nanoparticles increase the electrode/solution interface capacitance, constant phase element (CPE) and also increase the interface resistance. These electrodes that showed good sensitivity, reproducibility and stability can potentiometricaly determine Nickel ions. We studied thermodynamic parameters of fabricated electrodes.

Keywords: Nickel nanoparticle, Carbon paste electrode, EIS, XRD, Electrode thermodynamics.

DOI: https://doi.org/10.15623/ijret.2013.0211101